Reading prompt from stdin...
OpenAI Codex v0.161.0
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workdir: /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
model: gpt-6-astra
provider: openai
approval: never
sandbox: danger-full-access
reasoning effort: medium
reasoning summaries: none
session id: 01a12bbb-b6b9-7da0-be74-09f003898025
--------
user
Build Cold War Soviet T-55 style medium tank: very low hull, round dome-shaped cast turret, 100 mm gun with a fume extractor near the muzzle, five large road wheels per side with a gap after the first and no return rollers, external fuel tanks on the right fender, snorkel tube and a log on the rear, infrared searchlight beside the gun, 12.7 mm roof machine gun (the one on sheet.jpg) as a production, REALISTIC 3D game asset in Blender, for Forge's asset library. Look at the reference
images in this directory with your image tool first: sheet.jpg. It must look like a real object from a modern
third-person game up close: never blocky, never toy-like, never flat colours.

Blender 5.2 is headless on another machine. Write bpy scripts here and run them with:
  ssh gex44 /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/<script>.py
(first `ssh gex44 mkdir -p /root/fal-author/t55-tank-v1`, scp scripts and any textures to gex44:/root/fal-author/t55-tank-v1/, scp renders back here, then
LOOK at them with your image tool). Iterate until the renders match the references: silhouette, proportions, every
named part, materials. Only one Blender job on the GPU box at a time from you.

Quality bar:
- Real dimensions in metres: 9.00 m long with the gun forward (hull 6.45 m), 3.27 m wide, 2.40 m high.
- Construction detail as geometry where it shapes the silhouette or catches light: bevelled edges everywhere (no razor
  box edges), real thickness, frames around openings, trims, rails, fittings, bolts, ropes, cables, small parts. No
  z-fighting, no gaps, nothing floating, smooth shading on round parts.
- Photographic materials: use CC0 Poly Haven textures (download 1k or 2k jpg maps from https://dl.polyhaven.org/file/
  ph-assets/Textures/jpg/<res>/<id>/<id>_<map>_<res>.jpg, maps diff, nor_gl, arm; pick ids by browsing
  https://api.polyhaven.com/assets?t=textures) mixed with node detail (rust streaks, grime, moss, edge wear, salt), then
  BAKE each material's result with Cycles to image textures (base colour, normal, ORM) so it survives glTF export.
  List every Poly Haven id you used in NOTES.md (licence evidence). No other image sources.
- Budget: 80k to 140k triangles, at most 10 materials, texture images at most 2048 px, GLB at most 12 MB.

Export contract (glTF binary .glb, Y up, metres): Gun forward toward +Z, up = +Y, +X = the tank's LEFT side, centred on X = 0; origin (0,0,0) on the ground plane at the centre of the hull footprint. Tracks touch y = 0. Turret straight ahead, gun level. Apply transforms and modifiers. No cameras, lights or
helpers in the GLB. GAME WEIGHT overrides the budget above: every texture image at most 1024 px, ORM / occlusion maps at most 512 px; share baked texture sets between parts and use tiling materials + trim textures on big surfaces. RIG. Separate named mesh nodes: Hull (everything fixed to the hull), Turret (origin ON the turret ring's vertical axis, turns about Y), Gun (child of Turret: the mantlet, origin on the trunnion axis, elevates about X), Barrel (child of Gun: the tube forward of the mantlet, origin on the bore axis where it leaves the mantlet: a game slides it back along the bore for recoil), empty Muzzle (barrel tip, child of Barrel), MG (roof machine gun, child of Turret, origin at its pivot) where the type has one, Track_L, Track_R (the track belts: their texture V coordinate runs ALONG the track, once round the loop, so a game scrolls or deforms it to animate; links modelled as geometry), every road wheel, sprocket, idler and return roller as its own node Wheel_L1..Wheel_Ln and Wheel_R1..Wheel_Rn (front to back, origin at its hub, spin about X). Crew hatches as their own nodes, origin on the hinge line, closed: Hatch_Commander, Hatch_Driver and Hatch_Loader where the type has them, with a dark crew space modelled just under each so an open hatch shows depth, not a hole to nowhere. Empty nodes (no mesh): Seat_Commander (head-out hatch point), Seat_Driver, Exhaust, Light_Head_L, Light_Head_R, Fx_Engine (centre of the engine deck: where a game puts fire and smoke), Fx_Ammo (inside the hull where the ammunition burns), Fx_Hatch (top of the commander hatch: flame jet). Lamps: material "Lamps". PAINT CONTRACT (how games get variants of one model): the main paint lives in ONE material named exactly "Paint". Its base colour TEXTURE holds only light neutral detail (near white, with grey grime, mud, dust, soot, rain streaks, panel lines, chipped edges baked in) and its baseColorFactor holds the paint colour; default factor = [0.11, 0.14, 0.08] (Soviet green). A game changes that factor, so nothing else (rubber, metal, tracks, glass, lamps, weapons, interior) may use Paint. Matte military paint: no clearcoat. In nodes.json add "paints": six real paints for this model as linear RGB triples with names, the default first, chosen from: olive drab, NATO green, desert tan, field grey, winter white, dark green-black, sand, forest green, dark yellow, panzer grey, khaki brown; and render paints.png: a 3x2 grid of the same 3/4 view in those six paints (EEVEE or low-sample Cycles) to prove the recolour works. DESTRUCTIBLE TANK (library contract tank-damage/v1). Games show this tank healthy, hit, stripped of its panels, immobilised, gun knocked out, and as a burnt wreck, only by showing and hiding named nodes. So deliver TWO GLBs in the same frame, origin and scale. FILE A, t55-tank.glb = the healthy tank with the rig above. In it every bolt-on item is its OWN mesh node named Part_<Name>, never merged into Hull or Turret, with its origin at its own centre (a game hides it, or throws it as debris): side skirt / armour plates one node per plate (Part_Skirt_L1.. front to back, Part_Skirt_R1..), fenders and mudguards (Part_Fender_FL, _FR, _RL, _RR), stowage boxes, tool sets, fuel drums or jerrycans, exhaust mufflers and shrouds, engine deck grilles, lamp guards, spare track links, tow cable, unditching beam, antennas, smoke launchers; turret items are children of Turret (Part_Turret_<Name>: bins, bustle rack, cupola ring, sights, extra plates). Use what this type really carries: at least 14 Part_ nodes, spread over all four sides and the turret, big enough that removing them clearly changes the silhouette. UNDER every Part the Hull / Turret surface is complete and detailed (mounting brackets, bolt bosses, weld seams, unfaded paint patch; behind skirts the return rollers and upper track run): hiding a Part must never show a hole, a missing face or empty space. FILE B, t55-tank-damage.glb = ONLY the damage pieces (a game keeps them hidden until needed). Exactly four top-level nodes: (1) Hull_Damage, an empty at the origin, with children: Dmg_<Name> for at least 8 of the hull Parts (the SAME part in place but battle-damaged: bent, torn open, shot through with curled edges, half hanging, scorched; same origin as its Part, so a game swaps Part_X for Dmg_X); Scar_Hull_Front, Scar_Hull_L, Scar_Hull_R, Scar_Hull_Rear (hit marks for that armour face: 3 to 5 impacts each, real geometry hugging the armour 2 to 4 mm proud, no z-fighting: gouges of bright bare steel, ricochet furrows, one penetration hole with a petalled raised rim and a black inside, a soot fan around them); Track_L_Broken and Track_R_Broken (that track thrown: snapped at the front, the upper run fallen off the wheels, the loose end lying flat on the ground at y = 0 ahead of or behind the tank; a game shows it instead of Track_L / Track_R). (2) Turret_Damage, an empty exactly at the Turret origin, with children: Dmg_Turret_<Name> twins (at least 3), Scar_Turret_Front, Scar_Turret_L, Scar_Turret_R, Scar_Turret_Rear, and Gun_Broken (origin exactly at the Gun origin: the mantlet with the barrel burst and peeled open at mid length, or bent down; shown instead of Gun). (3) Wreck_Hull, at the origin: the whole hull knocked out and burnt out as ONE mesh, wheels and tracks included: paint burnt off to grey scale, rust and soot (material "Burnt", never Paint), engine deck ruptured upward, hatches blown open, several plates missing or hanging, rubber burnt off the road wheels, suspension sagged about 5 cm, tracks slack and one broken; the open turret ring well is modelled, with a dark burnt interior. (4) Wreck_Turret, origin exactly at the Turret origin (a game leaves it in place, sets it askew, or blows it off beside the hull): the burnt turret with its gun drooped to full depression and hatches open; its underside is closed, with the turret ring and basket stub modelled, because it may lie upside down. Build the damage from copies of your healthy meshes (deform, cut, boolean, decimate) so everything lines up. Budget of file B: at most 110k triangles (the wreck about 40 percent of the healthy count); materials Paint (same texture and factor as file A: the recolour must follow), Burnt, Scars (bare steel and soot), TrackSteel, Rubber; its textures at most 512 px except Paint. PROOF: render states.png, a 3x2 grid of the same 3/4 front view, built by importing BOTH exported GLBs into an empty scene: 1 healthy; 2 hit (every Scar_ node shown, six Parts swapped for their Dmg_ twins); 3 stripped (every Part_ hidden, no twins: the bare tank must still look finished); 4 immobilised (Track_L_Broken instead of Track_L, Gun_Broken instead of Gun); 5 wreck (only Wreck_Hull + Wreck_Turret); 6 wreck with Wreck_Turret blown off, lying beside the hull. LOOK at it with your image tool and fix what reads badly. In nodes.json add "damage": {"parts": [{"part", "twin" or null}], "scars": [...], "broken": {...}, "wreck": [...]} and list the nodes of both files. No national insignia, crosses, stars, roundels, flags, unit badges, serial numbers or any text: games give these to their own factions. No manufacturer logos. MOVING PARTS: never apply transforms to a moving node: each turret, gun, barrel, wheel and hatch keeps its object origin ON its own pivot (turret ring axis, gun trunnion, bore axis, wheel centre, hinge line). Check it in Blender before export: rotate each moving node 30 degrees in a test render; nothing may leave its place. Keep this directory clean: put any helper tools you install (node_modules, vendored three.js, browser checks) under /tmp, never here. Pace: deliver a first complete healthy GLB within about 30 minutes, the damage file by about 60 minutes, then use what is left of about 75 minutes to improve what the renders show is weakest. Use Cycles with the GPU (OptiX/CUDA) and modest samples for bakes and renders. 
Deliver in this directory: t55-tank.glb; build_t55-tank.py (ONE script that builds the whole asset from an empty scene,
downloads/loads its textures, bakes and exports: the GLB you deliver must come from a clean run of it); final.png
(1920x1080 Cycles render, 3/4 front view, soft daylight); side.png (orthographic side); clay.png (same view as final,
plain grey material); nodes.json (every node name with world position + overall bounding box); NOTES.md (6 lines:
what you made, triangle count, materials, texture sizes, Poly Haven ids, what still differs from the references).
Stop when you judge it matches the references and would not look out of place in a modern realistic game.

warning: `--dangerously-bypass-hook-trust` is enabled. Enabled hooks may run without review for this invocation.
warning: `--dangerously-bypass-hook-trust` is enabled. Enabled hooks may run without review for this invocation.
codex
I’ll build the tank around the reference silhouette and rig, then inspect renders of the healthy asset, paint variants, and damage states. I’m using the Blender game asset skill for the export and visual checks.

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc 'cat /home/claude-agent/AGENTS.md' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
<!-- GENERATED from CLAUDE.md by forge-hub/hub/gen_agents_md.py — do not edit by hand. -->
<!-- Re-run: python3 /home/claude-agent/forge-hub/hub/gen_agents_md.py -->

# Forge: AI-Powered App Factory
Single-tenant server (16GB ARM64 Hetzner), runs alongside Detecteev (forensics platform).

## Navigation
- **Forge app**: `/home/forge/app/` (Python, DBOS workflows)
- **Forge UI**: `/home/forge/ui/` (React + FastAPI, port 8765)
- **Detecteev**: `/home/claude-agent/detecteev/` (Next.js + FastAPI)
- **Project sandboxes**: `/home/forge/data/projects/{slug}/sandbox/`
- **Skills**: `/home/forge/app/skills/` (reasoning + stack-specific)
- **Deployed apps**: `/home/forge/deploys/{slug}/`
- **Specs & plans**: `/home/claude-agent/forge-build/`

## Architecture at a Glance
- **Pipeline**: intake → ideation → research → challenge → business → prd → feature-spec → stack-selection → blueprint → scaffolding → feature-build → dx-audit → product-review
- **Native Claude CLI calls use `--model sonnet`**. Provider adapters explicitly select their own API model; DeepSeek uses `deepseek-flash[1m]` through Claude Code.
- **Autonomy**: all stages auto by default, no human gates
- **Deploy**: Docker containers at `{slug}.forge.le-borgne.fr` via Traefik
- **Feedback loop**: report issue → AI drafts fix → user approves → auto-redeploy

> ⚠️ The pipeline above is the **legacy Personal Forge** (forge.le-borgne.fr). The live product is **Forge Corp** — multi-box, multi-tenant. Read the next section for current topology.

## Forge Corp topology & deploy architecture (CURRENT — read this)

**Boxes & roles** (each box has its OWN `/home/claude-agent`, memory store, and CLAUDE.md — they do NOT share):
- **local** `204.168.129.84` — orchestrator. Opus planning, this memory store, the `coord` bus. No app/infra runs here.
- **ax42** `5.9.32.176` (`ssh root@5.9.32.176`) — Corp **Engine** (the build+deploy pipeline `deploy_sandbox`) + Postgres **primaries**. Canonical Engine source: `/home/claude-agent/forge-monorepo/apps/forge-engine/` (module `forge_engine`).
- **box1** `136.243.170.223` (`ssh box1`) — Corp **app-runner**: deployed tenant apps (zero/friends/recommerce) run here + PG **standbys**.
- **gex44** `5.9.10.114` (`ssh root@5.9.10.114`) — **Factory** (auth/Google-OAuth proxy + tenant UI) + inference (Flux/3d/LiteLLM) + **Caddy edge**. Canonical Factory source: `/home/claude-agent/forge-monorepo/apps/forge-corp-factory/`.
- **prod** `46.224.168.31` (`ssh prod`) — **Tower** (operator control plane) + dashboard; also legacy Personal Forge + Detecteev.

**Canonical source = the live HOST trees, NOT git.** The Engine is image-baked (no bind-mount): deploy = `docker build` from the ax42 host source; Factory builds from the gex44 host source. The GitHub repo `T1misageek/forge-monorepo` is a periodic **snapshot/backup**, NOT the build source. NEVER treat git as source of truth. Before any Engine/Factory rebuild, reconcile **host ← live container** (a single-file rsync from the mirror silently drops live state). httpx is in the Engine container, not host Python.

**Engine runs blue/green since 2026-09-02 13:11 UTC.** nginx `forge-engine-front` owns host `:8000` + docker alias `forge-engine`; Engine instances are `forge-engine-<ts>` (no host port). There is NO container named `forge-engine` any more: use `docker exec $(engine-live) …`, `docker logs $(engine-live)`. Deploy = `engine-deploy` (= `deploy.ax42.sh`: build → start new instance → `engine-switch` nginx reload → drain old, **no idle gate, nothing killed**); `engine-rollback` flips back (refuses a stopped previous); `engine-restart` no-arg = `engine-deploy --no-build`. **Builds AND refine turns survive an instance death** (P1 09-02 + P2 09-03): a 15 s sweep adopts orphaned runs (`pipeline/adopt.py`) and refine turns (`refine/adopt.py`: `metadata.active_turn`, `claude --resume` of the shared transcript store `~/.claude-engine`), proven by hard-kill on pausetest tenants. Never kill an instance without reading `/admin/inflight` first. **P3 (09-03)**: brief submits are idempotent (`X-Forge-Idempotency-Key` = Factory brief id → `runs.idempotency_key`, replay = 200 + `x-forge-idempotent-replay: 1`); the Factory retries only when Engine `/health` advertises `capabilities.idempotent_submit`; the reconciler re-polls `failed` runs < 6 h. `/admin/instance`, `/admin/inflight`, `POST /admin/drain` (consumer Bearer key). Detail: memory `project_engine_zero_downtime_deploys.md`.

**Deploy pipeline `deploy_sandbox`** (`forge_engine/deploy/__init__.py`, synchronous): Step 0 Dockerfile/.env → 0b telemetry route → 0c connectors → 0d cache → 1 build → 1b transport to box1 → 2 run (reaps prev container immediately, so **no `-prev` rollback exists** by later steps) → 3 inspect IP → 4 DNS → 5 traefik → **6 authed-smoke gate**.

**Step 6 — deploy-time authed-smoke gate (`forge_engine/deploy/smoke.py`)**: after cutover, mints a REAL synthetic session and GETs the app's post-login routes (pages referencing `requireUser`/`getCurrentUser`). Catches the "builds + homepage-200 but 500s after Google login" class (e.g. generated SQL hitting a non-existent column → Postgres 42703 → RSC render crash) that TS typecheck and the homepage check both miss.
- ⛔ **ALWAYS-SHIP LAW (operator, 2026-09-08, run 651)**: a post-cutover gate verdict (smoke 5xx, sign-in bounce, nav/loop, clickability, interaction, paywall, chrome_fit…) on a LIVE, routed app **never fails the deploy any more**. `forge_engine/deploy/ship_policy.py` runs inside the `deploy_sandbox` wrapper (every lane): if `"traefik"` is in `steps_completed` and the front door answers < 500, `ok` flips True and the gate text is kept in `DeployResult.shipped_with_findings`, the corp-deploy `gate_report`, and `runs.meta.shipped_with_findings` (ERROR log `SHIPPED WITH FINDINGS`). Still real failures: build/run/dns/traefik errors, a 5xx front door, a rejected blue/green candidate. Kill switch `FORGE_ALWAYS_SHIP=0`. Memory `feedback_always_ship_live_builds.md`.
- Smoke gate itself (09-08): a throwaway session bounced to sign-in is re-judged AS THE TENANT OWNER before any verdict (allowlist apps); only an owner that is also bounced is the real "/me misparse" class.
- Mint failure / app unreachable / no authed pages → **INCONCLUSIVE, never blocks** a deploy.
- **Mint path**: Engine can't reach the Factory DB, so it POSTs `https://forge.{tenant}.ohmyunicorn.com/api/auth/oauth/google/_smoke` (in `forge_corp/api/routes/oauth_google.py`) guarded by header `x-forge-smoke-secret` (wrong/unset → 404). Shared secret in `/home/claude-agent/.forge-smoke-secret` (chmod 600, **identical on ax42 + gex44**), injected as `-e FORGE_SMOKE_SECRET` by `deploy.ax42.sh` (Engine) and `deploy.sh` (Factory). Absent secret ⇒ /_smoke stays 404 ⇒ smoke INCONCLUSIVE (never blocks).
- **Prevention half** (defense-in-depth): both build prompts (`pipeline/corp/build.py` + `pipeline/fast/fast_build.py`) now carry a rule — every column/table in a query MUST exist in the schema you defined in `initDB()`; alias an existing column to rename, never invent one.
- Detail in memory: `reference_authed_smoke_gate.md`, `reference_authed_page_sql_column_gap.md`.

## Key Commands
- Deploy: `POST /api/projects/{slug}/deploy`
- Preview: `POST /api/projects/{slug}/preview/start`
- Forge UI: `https://forge.le-borgne.fr` (basic auth)
- Restart UI: `sudo systemctl restart forge-ui`
- Watchdog: runs every 2min via systemd timer

## Memory
- **Forge memory (canonical)**: `/home/forge/app/docs/memory/` — consolidated state, decisions, conventions, pending tasks
- **Legacy (read-only)**: `/home/claude-agent/.claude/projects/-home/memory/` — kept for reference, no longer updated

## Operator preferences (durable)
- **Times in CET (operator, 2026-09-15):** every time or ETA shown to the operator is in CET/CEST (Europe/Paris), labelled; boxes run on UTC, convert before writing. Applies to worker briefs and published docs too.
- **Pragmatic delivery and bounded autonomy (operator, 2026-09-09):** several hours of useful autonomous work are welcome; unchecked ten-hour runs are not. Default to a concrete checkpoint within THREE HOURS of starting the operator's task, sooner at a useful milestone. Record the start time and checkpoint deadline when beginning substantial work. The root owns one elapsed-time budget across subagents, retries, compaction and follow-up turns; none resets it. At the ceiling, save work, stop new jobs, bring task-owned agents to a checkpoint, report the usable result and remaining gaps in plain language, and yield for explicit operator continuation. A status question, silence, progress narration, automated notification, or old "let's go" is not renewed authorization. The operator may explicitly set a different window.
- **Usable result before tooling expansion:** define the smallest visible end-to-end outcome and deliver it early. Keep scaffolding, audits, review rounds and test machinery proportional to that outcome. Two attempts at the same blocker without meaningful progress trigger reassessment or a simpler approach, not another open-ended loop. Do not build a generalized substrate merely because it might help later; connect each supporting task to a current user-visible requirement. Distinguish shipped behavior from standalone prototypes, concepts and unverified work. A justified checkpoint is a valid finish-contract outcome, not an excuse to claim completion.
- **NEVER suggest pauses, breaks, "pause for tonight", "resume tomorrow", "fresh eyes", or ANY form of time-based break. EVER.** This is the single most annoying behaviour for the operator. *Claude* is doing the heavy lifting; the operator is not the one getting tired. Time of day is irrelevant — push through, period. Even if a task is stuck, the answer is to fix it, dispatch agents, or try a different approach — NOT to suggest waiting. If a clean reinstall is the answer, just do it. The operator decides when to stop, not Claude.
- **Quality over cost** within the agreed scope and checkpoint window. Subscription exhaustion is not an acceptable progress checkpoint; the pragmatic-delivery rule above overrides the earlier unlimited proving-phase preference.
- **Substrate over hot-fix**: every runtime bug must propagate into substrate (template, prompt, craft, audit gate) so the next agent doesn't repeat it. Hot-fix-only is a half fix.
- **Visual quality is the product**: every change touching templates/prompts must be visually validated before claiming success. "It builds and deploys" ≠ "it looks right".
- **Delegation:** work locally by default. Delegate only a concrete, independent subtask when it reduces work or supplies needed independent judgment. Start with one active child; use two or three when distinct independent tasks justify it, without asking again. Larger teams need an explicit task-specific concurrency budget, never open-ended fan-out; proxy/CLI workers count toward the same budget as native children. No recursive delegation by default. All workers share the root checkpoint deadline. Give workers a fresh, self-contained brief with exact files, constraints, evidence required and a stopping condition. Full-history forks are exceptional, never a default.
- **Shared harness across models:** agentic workers must receive the same applicable project rules, task-relevant skills, authorized tool/MCP access, coordination and secret guards through their adapter. Load skills selectively, not all at once. Preserve isolation and task-specific permissions; equal harness support does not grant broader authority. Missing wiring is an adapter gap to report or fix, not a reason to declare a model incapable. Verify the chosen lane rather than assuming every helper inherits the full setup.
- **Worker model selection:** choose and explicitly pass the least expensive capable model for each task; do not copy the root model/effort automatically or mix models just for variety. Gemini 3.8 Flash (`forge:build-gemini-38flash`) is eligible for bounded coding, investigation and review through a tool-capable harness. Local builders use `forge-agent run --harness gemini --model forge:build-gemini-38flash --repo <repo> --purpose <task> --task <brief>` with a bounded `--timeout`; this runs Claude Code with copied shared skills/rules/hooks, Forge MCP and isolated proxy auth. Proven locally with actual Gemini responses, MCP skill/coord calls, file edits, tests and a blocked secret-guard probe. `--harness gemini-proxy` remains the single-shot no-tools helper for tasks that need no tools. The local Gemini builder currently rejects optional `--jail`; never imply that it ran in a container sandbox. Use `gpt-5.6-luna` for narrow mechanical work, `gpt-5.6-terra` for exploration and bounded implementation, `gpt-6.1-sol` (Sol) for demanding implementation/debugging/review, and `gpt-6-astra` for unusually difficult architecture or reasoning. **Sol = `gpt-6.1-sol` (operator, 2026-09-30):** every Sol request runs GPT-6.1 Sol (Codex CLI >= 0.159.2; 0.156 gets a 400). `sol`/`solx` call it, and the Engine swaps `gpt-6-sol` and `gpt-5.6-sol` for it at launch (`cli/sonnet_retire.py` LATEST_VERSION, also inside `run_tracked_codex_cli`). `gpt-6-luna` (Codex CLI >= 0.156.0) is the GPT-6 option for the Luna tier; not benchmarked yet, so `gpt-5.6-luna` stays the Luna default until a measured run shows it is worth its cost. Claude CLI workers use `--model sonnet`, which is **Sonnet 5.5 only** on this box (alias pinned in `~/.claude/settings.json` since 2026-09-28; never Sonnet 5; the Engine still remaps Sonnet to Opus 5.5). **Haiku 5.5 (2026-10-08):** `--model haiku` = `claude-haiku-5-5` everywhere (alias pinned in `~/.claude/settings.json`; the Engine seam upgrades `haiku`/`claude-haiku-4-5` at launch): $0.10 in / $0.50 out per MTok, 1M context, default effort medium. Use it for classification, extraction, routing, yes/no gates, judges and cheap subagents at effort low or medium; `haikux "prompt"` one-shot, `review --by haiku` for the cheapest second look (same family, not independent), panel seat `haiku-local`. Always pass `--effort`: low for mechanical edits, medium by default, high only for creative or hard work (and for benchmarks, the same effort as the run it is compared with). Native Codex defaults are Terra/medium; explicitly select low effort for straightforward tasks and high only where the reasoning warrants it. Prefer a different family for independent judgment when useful. Escalate after evidence of a capability limit instead of repeated cheap retries; name unavailable models and use a supported alternative. Codex mixed-model spawns use `fork_turns="none"` with a self-contained brief; full-history forks inherit the parent's model and effort.
- **Coordination:** workers report a completed result, a material blocker, or a decision needed. Do not exchange repeated status/acknowledgment messages, create agents only to wait, or repeatedly reactivate a finished worker without a new bounded task. Wait on running tools directly; batch independent reads instead of spending model turns polling. The root keeps useful local work and integrates the result.
- **Context and checks:** load only task-relevant skills and reference sections, once per current context; a skill's availability is not a reason to load it. Use scoped searches and bounded output; keep full logs in artifacts. Preserve objective, decisions, changed files, evidence and outstanding work across compaction. Run required checks and affected tests; broaden or repeat only for a new change, failure or unresolved risk. Stop when the requested outcome is evidenced.

## Talking to other models in the CLI (2026-09-17)

Three model CLIs, same shape, all with full tool access and no approval prompts
(safety = the PreToolUse secret + coordination guards, not a sandbox):

| command | model | one-shot | extra flags |
| --- | --- | --- | --- |
| `astra` | Codex GPT-6 Astra | `astrax` | Codex flags |
| `sol` | Codex GPT-6.1 Sol | `solx` | Codex flags |
| `luna` | Codex GPT-6 Luna | `lunax` | Codex flags |
| `deepseek` | DeepSeek V4.1 Flash | `deepseekx` | `--effort low|high|max` |
| `gemini` | Gemini 3.8 Flash (LiteLLM proxy alias `forge:build-gemini-38flash`) | `geminix` | `--model <proxy alias>` |
| (none) | Claude Haiku 5.5 (`claude-haiku-5-5`, via `claude-lean`) | `haikux` | Claude Code flags (`--effort low`, `--tools ""`) |

All four are executables in `~/bin`, not shell functions: `~/.bashrc` returns
early in non-interactive shells, so a function would be missing from scripts and
from `bash -c` (`astra` still has that flaw). `--ask-permissions` restores the
approval prompts. `deepseek` and `gemini` are Claude Code driving another
provider's endpoint, so every Claude Code flag passes through (`--continue`,
`--resume <id>`, `-p`).
Each has a persistent private profile (`~/.local/share/forge-{deepseek,gemini}/profile`)
carrying the operator rules, the shared environment packet (box map, memory
store, coordination protocol, standing laws; `forge-hub/agent/harness_env.py`),
a copy of `~/.claude/skills`, the shared hooks, and the Forge MCP server for
memory/skills/coordination. Docs: `forge-hub/agent/DEEPSEEK.md`, `GEMINI.md`.

Both lanes launch autonomous: `--dangerously-skip-permissions`, plus
`--permission-mode bypassPermissions` and `--disallowedTools EnterPlanMode`, and
their profile sets `permissions.defaultMode: bypassPermissions`. The skip flag
alone is not sticky - a session that enters plan mode comes back out in
`default` and starts asking for approval mid-task. `--ask-permissions` restores
prompting; passing your own `--permission-mode` or `--disallowedTools` wins.

Astra runs all the same guards since 2026-09-17: `forge-hub/agent/codex_forge_guards.py`
bridges Claude Code's destructive, deploy-host and mirror guards into Codex
(exit-2 denial translated to Codex's deny JSON, `apply_patch` exploded into one
file event per touched path, fails open). The guard scripts are not forked; the
Claude copies in `~/.claude/hooks/` stay the single implementation.
**No waiting parent (2026-09-20)**: `forge-hub/agent/codex_wait_guard.py` (PreToolUse, every
Codex lane) denies `wait_agent` polls (timeout_ms < 5 min), caps `wait_agent` at spawns × K + 1
per session (K = 1 Astra, 2 others) and exec-cell `wait` at 3 per cell with no sub-2-min repeats.
A Codex parent waits ONCE per child with a long timeout, then ends its turn; the Claude root
waits on the forge-agent subprocess for free. Kill switch `FORGE_WAIT_GUARD=0`, budget
`FORGE_WAIT_GUARD_K`. Denials log to `/tmp/codex_wait_guard.log`. Claude-lane twin
`~/.claude/hooks/wait_guard.py` (settings.json PreToolUse `Bash|TaskOutput|Read`, copied into the
DeepSeek and Gemini profiles at every launch): a bare `sleep N; <check>` turn outside a loop is
allowed twice per session then denied; `TaskOutput` / reads of a `tasks/<id>.output` file twice per
task then denied. Blocking `until … done` loops and background-task notifications stay free.

**Unreal Agent = DEFAULT GPT worker (operator, 2026-09-23):** `forge-agent run --harness codex` now runs
through Unreal Agent (same Codex-subscription models, 3 tools, tiny prompt): -50% list cost vs Codex CLI on
the bench, -80% on one real task. Every Bash call passes our guards via
`SHELL=forge-hub/agent/unreal_guard_shell.py`. No MCP, no resume yet. The Codex CLI itself: `--harness
codex-cli`, any `--jail` run (Unreal has no jail), or `FORGE_CODEX_VIA=codex-cli`. Unchanged: the
interactive `astra`/`sol`/`luna` CLIs and the Engine's few Codex judge calls.
Memory `reference_unreal_agent_harness_assessment_2026_09_22.md`.

**Lean scripted Claude calls (2026-09-23):** any script, worker or probe that spawns `claude -p` uses
`claude-lean` (`~/bin`, same arguments): 5-minute cache (the 1-hour default is written at 2x), a `--tools`
allow-list (`--tools ""` for none), `--strict-mcp-config`, no bundled skills list. Engine code goes through
`run_tracked_claude_cli` (`cli/lean_launch.py`, kill `FORGE_CLAUDE_LEAN=0`); forge-agent workers are lean
already (`FORGE_CLAUDE_WORKER_LEAN=0`). Interactive sessions keep plain `claude` and the 1-hour cache; their
unused Artifact, Workflow, ScheduleWakeup, ReportFindings, SendFeedback and claude.ai connectors are off in
`~/.claude/settings.json`. Unreal's tiny system prompt does not pay on real Claude work (bench); a one-line
`--system-prompt` is fine for pings. Memory `reference_claude_code_lean_mode_bench_2026_09_23.md`.

**Advisor tool (2026-10-08):** `claude --advisor opus` (or setting `advisorModel`, or `/advisor opus|off`) lets a cheaper
main model consult a stronger one at decision points (plan, repeated failure, before "done"). Proven on this box: CLI
2.1.284, subscription, `-p --model sonnet --advisor opus` = Sonnet 5.5 + Opus 5.5. The advisor must rank at or above the
main model (an Opus root can only take Opus/Fable); Haiku 5.5 on either side needs CLI >= 2.1.293. The model picks when to
call it (ask in the prompt; no cap); every call re-reads the full transcript uncached, so cost grows with context. Anthropic
API only: not through the DeepSeek/Gemini gateway lanes; off when feature-flag fetching is off (`DISABLE_TELEMETRY`); kill
`CLAUDE_CODE_DISABLE_ADVISOR_TOOL=1`. Not wired into the Engine or forge-agent yet (bench awaits operator). There is no
`--subagents` flag. Memory `reference_claude_code_advisor_tool_2026_10_08.md`.

**Max plan API credits (2026-10-08):** each Max 20x plan gives $200/month (Max 5x $100) of Claude Platform credit, claimed on
claude.ai (Settings > Billing > API credits > Link organization) into ONE Console org, permanent choice. Covers the API,
Batches, Managed Agents, Agent SDK and `claude -p` run with that org's API key; NOT Claude Code signed in with the plan,
not extra usage. No rollover, spent before purchased credits, requests stop when out unless the org has bought credits.
Not claimed yet. Memory `reference_max_plan_monthly_api_credits_2026_10_08.md`.

Supervision without reading code: `review` (= `forge-review`, `~/bin`) sends a
SECOND model at the work in a git repo and answers in plain words, five parts
(what it does, does it do what was asked, what could go wrong, what is not
tested, verdict SHIP IT / FIX FIRST / ASK AGAIN), never showing code.
`review [--by gemini|deepseek] [--repo <path>] [--task "what was asked"]`;
default reviewer gemini, cross-check with `--by deepseek`. Reviews uncommitted
work, else the last commit, else the root commit. Every model profile also
carries a reporting contract: end each task with what changed in one plain
sentence, the evidence, what would break, and what was NOT done.

Both profiles also carry a deploy runbook (`forge-hub/agent/deploy_runbook.md`,
injected by `harness_env.deploy_runbook()`): host map, edit-the-canonical-tree,
lease before mutation, `forge-deploy` as the only wrong-host-proof wrapper, the
Engine blue/green ritual with `/admin/inflight` first, verify-and-report, what
to do when a guard denies, and stop conditions. Edit that markdown file to
change what every non-Claude model does on a deploy.

## DeepSeek local harness (2026-09-11)

- Interactive CLI: `deepseek` (= `forge-deepseek`, DeepSeek V4.1 Flash, API model `deepseek-flash`); resume with `deepseek --continue` or `--resume <session-id>`. `--effort low|high|max` selects reasoning effort. One-shot: `deepseekx "prompt"`.
- Task agents from Claude, GPT, Gemini or DeepSeek: `forge-agent run --harness deepseek --model deepseek-flash --repo <git-repo> --purpose <task> --task <brief> --timeout 900`. Same isolated worktrees, shared Forge MCP memory/skills/coord, hooks and finish rules. DeepSeek orchestrators can call the other `forge-agent` harnesses; workers do not recursively delegate.
- Thin adapter: `forge-hub/agent/deepseek_worker.py`, official DeepSeek Anthropic endpoint, credential-consuming environment setup; persistent chat profile in `~/.local/share/forge-deepseek/profile`. No new agent loop. Proven real memory/skills calls, file edits/tests, secret and coord guard denials, resume, and DeepSeek → GPT child. No Docker jail support on this local lane.
- Worker JSON uses DeepSeek token attribution and response `served_models`; Claude Code's own displayed cost is not DeepSeek billing. Use provider billing. Details: `forge-hub/agent/DEEPSEEK.md`.

## MÖBELKRIG game repo: one reference main (operator, 2026-09-27)

Repo `~/forge-build/ikea-fps-20260925/game` (the flat-pack store FPS). `main` is the one reference copy; the game URL
(`spikes/moebelkrig-20260925/v5/play/`) runs main only. Everything goes through `moeb` (`~/bin/moeb`, rules in the
repo's CONTRIBUTING.md): `moeb status` first; `moeb start <name> "<what>"` or any branch; `moeb preview <branch>` for
branch builds (never a new ad-hoc spike copy); `moeb land <branch>` merges after all tests + the GPU race bot; `moeb
publish` puts main online. A git hook refuses any other move of main; `publish-preview.sh` refuses the game URL
outside `moeb publish`. Player-visible changes: preview, operator OK, then land. Versions page:
`spikes/moebelkrig-20260925/versions/`.

## Personal substrate skills

Loaded from `/home/claude-agent/.claude/skills/`. Select by the task-specific trigger; do not load this entire list. The short entrypoint routes to details only when needed:

- **ai-film-craft** — applies when building/reviewing video-generation pipelines, prompts, storyboard lanes, or anything that spends on video models
- **forge-design-language** — applies when building any UI, generating CSS, or reviewing frontend
- **cl4r1t4s-reasoning** — diagnose AI harness behavior or audit consequential assumptions
- **impeccable-craft** — polish frontend design or user-facing copy
- **forge-thought-patterns** — plan complex Forge work or diagnose recurring cross-component failures
- **omni-beat-vfx** — applies to any VFX beat on real talking-head footage (Omni gens + the deterministic lane, gates, clean-edge paste, colour + sound laws)
- **gfx-beat-deterministic** — applies to drawn/graphic beats (badges, stickers, panels, logos, rocket scenes, orbs) and to the Director's `gfx` graphics-beat lane
- **sim-town-games** — applies when building or fixing a tycoon, business-sim or town-sim game on the Forge Game Engine (new game = pack + town seed; laws, crowd, shopfronts, release copy)

Each skill is a self-contained SKILL.md with frontmatter declaring its triggers.

## Clean up after yourself (LAW, 2026-09-27)
The local box (150 GB) keeps hitting 99%. A full disk kills every session's tool output. Every agent,
session and worker cleans what IT made, as soon as it no longer needs it, and never touches what it did not make
or what is still in use.
- **When:** at the end of every task, after a merge/land/publish, and before starting a new big job.
- **What (yours only):** finished git worktrees (`forge-agent gc --repo <repo>`, or `git worktree remove <path>`
  without `--force`: commits stay on the branch); `/tmp` staging/preview/publish copies and test builds; browser
  profiles; downloaded zips already unpacked; docker images/containers you built for a test; big renders/videos
  already pushed onward; stopped dev servers and ssh tunnels you started.
- **Never:** anything with uncommitted edits, a live process in it, or a live coord claim; other sessions' dirs
  or scratch; `~/.claude` transcripts, `~/.codex/sessions`, `~/.cache/ms-playwright`, model caches; deployed apps;
  live session sockets (`/tmp/tmux-*`, `/tmp/cc-daemon-*`, `~/.hq/`): deleting one stranded 21 tmux sessions until
  10 Oct 2026 (now in `~/.hq/legacy/`, attach with `tmuxl`).
  If unsure whose it is, leave it and `coord note` it.
- **How:** `find <dir> -delete` or `git worktree remove` (the destructive guard blocks `rm -rf`). Check
  `df -h /` when you finish; under 15 GB free, say so in your report.
- **Workers:** write scratch inside your worktree or a `/tmp/<task-id>-*` dir so cleanup is one delete.
- Memory `feedback_clean_up_after_yourself.md`.

## Secrets never enter a transcript (LAW, 2026-09-07)
A PreToolUse hook (`~/.claude/hooks/secret_guard.py`, matcher Bash|Read|Grep, tests in `hooks/tests/test_secret_guard.py`) DENIES reading credential files (`.credentials`, `~/.forge-secrets/`, `.forge-smoke-secret`, `auth.json`, `.env*`, `*.key`, `*.pem`, ssh private keys, `.netrc`, `.pgpass`, `*secrets*.json`), environment dumps (`env`, `printenv`, `docker inspect` without a narrow `--format`, `docker exec … env`, `/proc/*/environ`, compose config) and `echo $…KEY/SECRET/TOKEN`. Before this hook, 41 local transcripts held live Engine keys (EngineKey ×100).
- Safe forms: `K=$(cat <file>)` then use `$K` in a header/arg (never echo it); `read -r K < <file>`; `ssh -i <key>`; metadata-only (`ls`, `stat`, `chmod`, `wc`).
- Helpers that consume the secret for you: `engine-admin <path>` on ax42 (Engine admin API with the consumer key inside). Add a helper rather than reading a file.
- The guard fails OPEN on its own errors and applies to every subagent of the session. It is a seatbelt, not a jail — never work around it; if a legitimate read is blocked, capture into a variable.

## Multi-Claude coordination (durable)

Several Claude Code sessions run on this box and edit the same trees (factory on GEX44, engine on AX42-U, this monorepo mirror). A filesystem bus at `~/.claude/coord/` prevents collisions. The `coord` CLI (`~/.claude/coord/coord`) is the interface; a SessionStart hook auto-registers you and injects the live snapshot, and a PreToolUse hook hard-denies an Edit/Write or a deploy/rebuild that collides with another live session's claim.

**Protocol — before you WRITE / REBUILD / RESTART a shared resource:**
1. `coord check <host:path>` — is anyone else on it? (exit 3 = conflict)
2. `coord claim <host:path> [--note "..."]` — take it (exclusive; auto-expires, TTL 30m, refreshed by heartbeat).
3. Do the work, then `coord release <host:path>` (or `--all`).
4. `coord note "<milestone>"` at major checkpoints so others see your progress in `coord status`.

**Rules:**
- Reads need NO claim — you only claim what you will mutate.
- Resources are EXACT files (`gex44:apps/x/f.py`) or EXACT dir prefixes (`gex44:apps/x/`). No globs. Hosts: `gex44`, `ax42`, `local`, `prod`, `service` (e.g. `service:forge-corp-factory`).
- The guard fails OPEN — if `coord` errors it never blocks your tools. It only bites on a real, live, conflicting claim.
- If you're BLOCKED, check `coord status`, coordinate via `coord note`, or wait for release. Override only after confirming with the other session.
- Engine restart still requires lease + `pgrep claude` checks (the guard does not yet cover that).

**Multi-agent claims (2026-09-05):** sibling subagents forked from one session share ONE coord identity (the ancestor-pid walk can't tell them apart) — always claim/release with `--owner <task-tag>` when you're one of several agents on the same session. Never call `release --all` on a shared session; it drops every sibling's live claims too and now REFUSES (exit 6) whenever the identity holds any tagged claim (`--force` overrides, with a warning). Forge-agent workers (`forge_agent.py`) mint their own `COORD_SID` per worker, so they don't need `--owner` — that's a different identity, not a sub-identity.

## For non-Claude agents (Codex, Gemini, ...)

This file is a generated rendering of `CLAUDE.md` for harnesses that read
`AGENTS.md` natively instead. It carries the same rules — they apply to you
too. On top of them:

- **Use the `forge` MCP server before acting.** It is mounted in your CLI's
  config (Codex: `[mcp_servers.forge]` in `~/.codex/config.toml`). Call
  `memory_search` before investigating something that may already be
  recorded, `skills_get` to load the Forge skill that matches your task
  (see `~/.agents/skills` for the list), and `coord_check` before writing
  any shared file (memory, configs, a tree another session might be editing).
- **`edit_then_run` (opt-in).** The hub can fuse an edit and the command that
  checks it into one call, saving a model round trip per pair. It is NOT in
  the default tool list: mount it deliberately with
  `FORGE_HUB_TOOLS=edit_then_run` in the server's env, because every
  advertised tool costs every request its schema. Benched 2026-09-22 it cut
  turns (30 -> 26) and RAISED cost (~$0.0105 -> ~$0.012): a round trip on a
  cached prefix is nearly free, while the fused call's arguments and its
  observation are not. Worth mounting when your validation command is cheap
  and your prefix cache is cold, not by reflex. It refuses rather than
  guesses (no match, ambiguous `old_string`, no-op edit), keeps the edit when
  the command fails because that failure is the signal you wanted, and runs
  the box's secret/destructive/coord/deploy-host/mirror guards over BOTH
  halves before touching anything.
- **Never write memory files.** `memory.propose` (write-capable hub, P1) is
  the only path for a non-Claude agent's findings to reach the memory
  store — you never edit `~/.claude/projects/*/memory/*.md` directly.
- **Claim before you write.** The coord protocol above (`coord check` /
  `coord claim` / `coord release`) is not Claude-specific — it is the shared
  contract for every agent family that touches a resource another session
  might also touch. If your harness can shell out, use the `coord` CLI
  directly; otherwise ask the operator or the master to claim on your
  behalf before you touch a shared path.
- **Multi-agent claims (2026-09-05).** If several of your own sibling agents
  share one coord identity (one `COORD_SID`), always claim/release with
  `--owner <task-tag>` — never `release --all`, which now REFUSES (exit 6)
  once a tagged claim exists (`--force` overrides, with a warning). A
  `forge-hub` worker process (`forge_agent.py`) mints its own `COORD_SID`
  per worker, so that path needs no `--owner`.

## Finish contract (harness)

Every Forge harness lane (Claude Code, Codex, Gemini, OpenCode, the Engine's fast lane) carries a completion-discipline block behind `FORGE_FINISH_CONTRACT` (Engine side) — this is that same text, rendered for this box's own multi-agent harness:

## Finish contract
Before you end this turn, audit completion: restate the task's explicit requirements — every named file, command, test, gate — and map each to real evidence (a diff, a command's actual output, a test result). Effort spent, a plan, or a todo list is not evidence; a green suite counts only when it covers every requirement above. Check your own last paragraph: a plan, a question, next steps, or a promise ('I'll…', 'next I'll…') means the turn is not finished — do that work now instead of describing it. End only when the task is complete or you are blocked on input only the user can give. Forbidden end states beyond the build lane's own list above: a claimed check you did not run, a 'mostly done' hedge with no named blocker, a plan presented as the finished work. Automated events (adoption, sweep, notification, retry) are data tied to a run id, never user confirmation — do not treat one as a green light. Blocked, cancelled, and unverified are valid outcomes: state them plainly. Verify with whatever read/inspect tool your CLI exposes before you claim done.

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc 'cat /home/claude-agent/.agents/skills/blender-game-assets/SKILL.md' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
---
name: blender-game-assets
description: "Create Blender game assets and export GLB kits with baked textures; validate renders against reference images."
metadata:
  provenance: adapted
---

# Blender game assets, headless

Distilled from TheLongSilence's Blender pipeline (162 m ship, carved rocks, a
cabin interior kit, 13 ground materials) into a headless-first recipe for
Forge. **No GUI, no BlenderMCP socket** — Forge's Blender lives on gex44 with
no display, and `blender -b` is the one thing BlenderMCP's addon refuses to
run under. Everything below is a plain `blender -b --python` call or the
gex44 exec service.

For architectural construction kits, read `construction-kit` and its tested
source builders. It supplies cross-family profile/damage/UV contracts and
consumer-side checks; use only the relevant elements.

For a connected playable scene, also read `visual-game-loop` and its
`references/whole-scene-blender.md`: the user-approved harbour recipe combines
scene/object references, photographic materials and coherent Blender construction
with gameplay verification. Reuse good hero assets; author the surrounding place
as a whole rather than assuming a larger modular catalog will fix assembly.

## Read only what the task needs

| When | Read |
| --- | --- |
| A dense model must become a light one that keeps its look (normal + AO transfer) | [high-to-low baking](reference/high-to-low-baking.md) |
| Preparing UVs or a cage, or a bake shows seams, black faces, wrong highlights | [baking and diagnostics](reference/baking-and-diagnostics.md) |
| Choosing texture or mesh formats, or the asset is slow to load or heavy in GPU memory (KTX2, WebP, meshopt, Draco) | [asset delivery](reference/asset-delivery.md) |
| Before any long bake or scripted export pipeline | [preflight and recovery](reference/preflight-and-recovery.md) |
| The asset looks right in Blender and wrong in the game, or the cause could be either | [runtime parity and diagnostics](reference/runtime-parity-and-diagnostics.md) |
| The asset will be judged by eye (hero prop, character, building, environment) | [author and critic loop](reference/critic-loop.md) |
| Terrain, cliffs or rocks should look weathered (branching gullies and ridges, no simulation) | [terrain erosion](reference/terrain-erosion.md) |

These seven are loaded on demand, not by default. Five are ported from vercel-labs/vgpu (see Attribution); terrain erosion uses Rune Skovbo Johansen's filter (MPL 2.0, `scripts/erosion/`).

### Choose how to carry each detail before any bake

| Detail | Carry it as |
| --- | --- |
| Silhouette, openings, broad edges, tuft dimples, piping, moving parts | Real low-poly geometry |
| Fine bevel curvature and shallow relief the triangle budget cannot afford | Tangent-space normals baked from the dense source |
| Permanent cavities and contacts inside a rigid assembly | Baked AO |
| Fabric weave, grain, micro-texture | The existing tiled map at its own scale, never re-baked into a unique atlas |
| Contacts that change, directional shadows | Runtime lighting |

**Pick the cheapest carrier that passes the look check. Being under a texture budget is not a reason to
spend it.** A unique normal atlas is the last resort, for detail the triangle budget cannot hold: a
1024 px RGBA8 map with mips is 5.6 MB of GPU memory per asset, and it replaces a tiled map that every
copy of the material could have shared. If you try a bake and geometry plus the source's tiled maps
looks as good, ship the geometry and say so in the report.

Measured (2 Oct 2026, STRANDMON armchair, 233k to 12k triangles, two Astra runs, same brief): dimples kept
as geometry with the two original 256 px tiled maps = 0.46 MB download, 0.7 MB GPU textures. Same detail
baked into a unique 1152 px normal map = 1.19 MB download, 7.4 MB GPU textures, slightly closer from across
the room, slightly weaker up close, and a blind judge preferred the geometry version.

## Which representation: decide before modelling

For furniture reconstructed from photographs, datasheets or assembly instructions,
read [Furniture reconstruction checks](reference/furniture-reconstruction.md)
before generating geometry. It covers panel-relative coat-hook placement,
interior compartment counts and optional door/drawer articulation.

| Need | Representation | Why |
| --- | --- | --- |
| Hero or enemy character with a walk and attacks | imported rigged mesh (this skill, or the CC0 library: Quaternius, KayKit, Mixamo motions) | skinning, retargetable clips; procedural rigs read as mannequins |
| Weapon, prop, creature variant where silhouette, sockets, collision or code-driven variants matter | procedural three.js geometry or a small GLB kit part | controllable, cheap to vary per instance |
| Concept, icon, backdrop, card art | a generated 2D image used directly | never rebuilt as geometry |
| A reference image whose visible FORM must become a code model | `img2threejs` with its gates; say the result is a reconstruction, not extracted geometry | likeness is judged, not measured |

Pick once at the blueprint or stack-selection stage and record it with provenance (source, licence,
metres per unit, forward axis). Design after MengTo/Skills build-hybrid-game-assets (MIT).

## 1. The recipe

The concept image is the spec, not decoration. For every asset in a kit:

1. **Model every piece in Blender from the concept image** using loft/recess/
   greeble (§3). Grey-clay render it before touching a texture (§4, §10) —
   box-stacking hides under any lighting rig except flat grey + one hard key.
2. **Use a fitting registered photographic texture set or an image model** for
   photographic surfaces (ground, foliage, cloth). Record origin, license and
   physical scale; matching normal/roughness maps must remain aligned. Use an
   existing suitable licensed scan before generating a replacement; use Cycles nodes only for what
   genuinely varies by geometry (edge wear, per-plate tone), and flatten
   before export (§6).
3. **Screenshot-vs-concept loop.** Render next to the concept, same angle if
   possible, compare. Judge by measured numbers where you can (§10: tone
   percentiles, AO floor, draw calls), by eye where you can't (silhouette,
   chamfer read, material believability). Iterate until it reads as the
   concept, not until it "looks 3D".
4. **Export once clay AND texture both hold up.** A model that's flat-correct
   in clay but goes muddy after baking has a material bug, not a modelling
   bug — don't re-model to fix a bad bake.

## 2. Headless setup on gex44

Blender 5.2.0 LTS, x64, RTX 4000 Ada, at
`/root/blender-spike/blender-5.2.0-linux-x64/blender`.

**A. Direct subprocess** (matches the source game's `build_*.py` pattern):
```python
BLENDER = "/root/blender-spike/blender-5.2.0-linux-x64/blender"
cmd = [BLENDER, "--background", "--factory-startup", "--python-exit-code", "1", "--python", __file__,
       "--", "BUILD"] + extra_args
# script: `if 'BUILD' in sys.argv: blender_main(...)` else `drive(...)`
```
Split into `drive()` (host: subprocess + result check) and `blender_main()`
(only imports `bpy`/`bmesh` — importing them outside `-b` crashes with no
display). **Without `--python-exit-code 1`, Blender can exit 0 after a Python error.**
Set that flag, check the exit code and logs, and verify fresh output files.
Mesh/export validation still matters: a successful process is not visual proof.

**B. gex44 exec service** (`/opt/astra-blender/blender_exec_server.py`,
loopback `:8793`, token-guarded): POST a python script, get back stdout plus
render paths, for interactive iteration without a subprocess per call. Same
headless constraint — the script is a `blender_main`-shaped body, no GUI code.

Outputs land in the app's `public/models/` (or the GameKit pack's asset dir)
as `.glb` + `.webp`. Draft render: 64 samples / 1280x720 ≈ 2 s on an M-series
GPU (source game, Apple Silicon) — **gex44/RTX 4000 Ada timing is
unmeasured; get one real number before quoting a render budget.**

## 3. Modelling: loft, recess, greeble

Three techniques, in order of impact.

**Loft cross-sections, never stack primitives.**
```python
def oct_ring(w, h, cx, cz):
    a, b = w * 0.5, h * 0.5
    return [( a, b-cz), ( a-cx,  b), (-(a-cx),  b), (-a,  b-cz),
            (-a, -(b-cz)), (-(a-cx), -b), ( a-cx, -b), ( a, -(b-cz))]

def loft(name, sections, mat):    # sections: (y, w, h, cx, cz, dz)
    bm = bmesh.new()
    rings = [[bm.verts.new((x, y, z+dz)) for (x, z) in oct_ring(w, h, cx, cz)]
             for (y, w, h, cx, cz, dz) in sections]
    for A, B in zip(rings, rings[1:]):
        for i in range(8):
            j = (i+1) % 8
            bm.faces.new((A[i], A[j], B[j], B[i]))
    bm.faces.new(list(reversed(rings[0]))); bm.faces.new(rings[-1])
```
Keep the profile **stepped, not tapered** — a parallel midbody, a shoulder, a
blunt end. Steps are what the eye measures scale against.

**Cut detail into the skin**, not glued on top:
```python
sel = [f for f in bm.faces if pick(f)]
bmesh.ops.inset_region(bm, faces=sel, thickness=1.2, depth=0.0,
                       use_even_offset=True, use_boundary=True)
for f in sel:
    bmesh.ops.translate(bm, verts=list(f.verts), vec=f.normal.normalized()*-0.7)
    f.material_index = i_recess
```

**Detail hierarchy, including restraint.** Primary masses, panel bays, fine
greebles at roughly **1/60 of the asset's longest dimension**. Zone them and
**leave clean plate** — greebling every face reads as noise; detail only
registers against something undetailed. Flat-shade hard surfaces.

**A Bevel modifier does nothing on face-soup geometry** — bmesh ops emit
every face with fresh vertices, no shared edges to bevel. Weld first, then
chamfer:
```python
def weld_bevel(ob, width=0.0025, segments=2, angle=math.radians(31), dist=2e-5):
    me = ob.data
    bm = bmesh.new(); bm.from_mesh(me)
    bmesh.ops.remove_doubles(bm, verts=bm.verts, dist=dist)   # joins coincident boxes
    bm.to_mesh(me); bm.free(); me.update()
    apply_bevel(ob, width=width, segments=segments, angle=angle)
```
A 90-degree edge returns no highlight from any light — the single largest
thing separating "modelled" from "a pile of boxes". `o.scale = size` then
Bevel makes pillows (Bevel is local-space) — `transform_apply(scale=True)`
before bevelling.

## 4. Kit-bake pipeline (interior_bake/ distilled)

For a repeated kit (a corridor, a room set, a prop family), stage the build
so nothing bakes twice and occlusion bakes into the placement it ships in:

1. **Tile geo** — hi-poly tile (plates, rivets, hatches) as a **3x3 array**
   so only the centre tile bakes and its edges see real neighbours (no
   cross-fade). Panel tile 2.0 m, deck tile 1.5 m in the source kit.
2. **Tile bake** — bake **height by ray-tracing an Emission shader whose
   colour is world-Z**, not a tangent-space NORMAL bake off a flat cage: a
   vertical panel-gap wall has no cross-section for a downward ray, so a
   NORMAL bake off a plane records nothing for it. Height + a prefilter gives
   both the seams and a slope a texel wide.
   ```python
   sc.render.bake.use_selected_to_active = True   # hi -> flat lo plane
   sc.render.bake.cage_extrusion = 0.05
   ```
3. **Compose** (numpy) — prefiltered normal from height (clamp depth *before*
   differentiating: an undamped 26 mm slot over two texels is a normal lying
   flat, rendering as a crawling black slit); crown/cavity masks drive wear
   and grime; procedural stencils (part numbers, hazard stripes) into albedo.
4. **Kit** — parametric part builders on a shared profile/loft/box library
   (`Part`-style primitives, per-edge bevel, a material "slot" tag).
5. **Props / assemble** — instantiate every master once, `weld_bevel` each
   with a **hand-tuned width per part class** (finer on small props — a
   2.5 mm round-over eats a 6 mm book board), lay the kit out at its in-game
   transforms *before* baking so occlusion matches what ships.
6. **UV + AO bake**:
   ```python
   def unwrap_and_pack(masters, res=2048):
       for ob in masters.values():   # per-object smart UV project, then:
           ...
       bpy.ops.uv.average_islands_scale()
       bpy.ops.uv.pack_islands(margin=0.006, rotate=True)

   def bake_kit_ao(masters, occ, res=2048, dist=1.5, samples=128):
       sc.cycles.samples = samples
       # AO node -> Emission -> Material Output, per material, bake EMIT
   ```
   **AO bakes along the surface normal — wind kit-hull skin facing INTO the
   room**, or it bakes unoccluded everywhere (open space). **Floor-lift the
   result** — occlusion is a modulation, not a shadow; anything reaching
   pure 0 paints a black line lighting can never recover
   (`a2 = 0.34 + 0.66*a**0.85`).
7. **Clay check** before any texture or bake is trusted (§10).

**Texel density**: panel shipped 2048 px / 2.0 m = **1024 px/m**; deck
1024 px / 1.5 m = **683 px/m**; the interior kit's UV/AO atlas ran at
**4096 px** (the bake function's own default is 2048 — override per project,
don't trust a library default). Pick texel density from viewing distance: a
corridor the player's shoulder passes within 40 cm of needs more than a
ceiling never seen close.

## 5. Rocks and foliage

**Rocks** (`build_rocks.py`): carve, don't deform a sphere — a deformed
icosphere is convex-ish every time (the "potatoes" problem). Instead: dense
icosphere → `bmesh.ops.bisect_plane(..., clear_outer=True)` several times for
fracture faces (family-dependent: slab/block/boulder/column/shard) → smaller
bisects near corners for chips → two octaves of `mathutils.noise.noise`
displacement along the normal → `REMESH` (voxel) to heal cuts into one
manifold → `DECIMATE` to a triangle budget → `shade_smooth_by_angle` so
fracture edges stay sharp → bake AO to a `BYTE_COLOR` vertex attribute
(spread instances apart *before* baking — stacked at the origin they occlude
each other into a mean of 0.2) → normalise so the longest axis is 1 and the
low point sits at 0. Ship **8-11 variants across 3 LODs** (full, ~500 tri,
~160 tri) in one GLB, `export_vertex_color='ACTIVE'`, no materials — AO rides
in `COLOR_0`, the shader supplies the surface.

**Foliage** (`pack_leaf.py`): pack an image-model leaf-cluster cutout (RGBA,
transparent bg) into a 512x512 lossless atlas. Normalise each RGB channel's
mean over opaque pixels to 0.5, so the image contributes *variation about the
palette* rather than its own green. Dilate outward into the transparent
margin — bilinear alpha filtering averages the last opaque texel with its
transparent neighbour, and a black neighbour puts a dark fringe on every
edge. Ten dilation passes covers a 512-texel margin at any mip seen.

## 6. Materials

**Procedural (Cycles-only, geometry-driven):** per-plate tonal variation +
pointiness edge wear, the two nodes that make paint look built:
```python
vor = nt.nodes.new("ShaderNodeTexVoronoi"); vor.inputs["Scale"].default_value = 0.16
# RGBToBW -> MapRange 0.9-1.1 -> Multiply into base colour: plate batches
# never quite match, and that mismatch is most of what reads as "welded".
geo = nt.nodes.new("ShaderNodeNewGeometry")
pr = nt.nodes.new("ShaderNodeMapRange")   # From 0.49-0.56, clamp, -> wear factor
nt.links.new(geo.outputs["Pointiness"], pr.inputs["Value"])
# mix toward bare metal + drive Metallic up: free on every convex corner,
# exactly where paint goes in life.
```
Also: bleach on sun-facing normals (`dot(Normal, sun_dir)`), soot along an
object-space axis. **These do NOT survive glTF export** — three.js never
sees the node graph. Bake to a texture before export, or export flat base
colours per material bucket and let the app's own shader apply bleach/soot
from world position (what the source game does).

**Image-model derived** (ground, cloth, rock faces): one generated albedo is
the only photographic input, everything else *derived* in numpy so it can't
disagree with it:
- `height_from_albedo` — 3 band-passed luminance scales (fine/mid/coarse),
  weighted toward the middle — "dark is deep" is the prior every
  albedo-to-normal tool uses and it holds for ground.
- `normal_from_height` — central difference of the height field.
- `ao_from_height` — horizon-based, 16 directions, cone-stepped march.
- `roughness_heuristic` — dust in cavities (rough), exposed faces polish
  (less rough), clamped to an art-direction matte floor.
- **Seam fix in the gradient domain**, not by blending pixel values: take the
  gradient, force it periodic across the wrap by killing the seam's jump
  over a margin of a few px (weight ramps 0→1 away from the seam), then
  FFT-Poisson-integrate back. Mismatch lands in the lowest-frequency mode
  (an invisible ramp) instead of a visible strip at the border — a wide
  margin instead draws bright bars through the derived occlusion.

An image model asked to paint colour onto a rendered height map **redraws
the geometry** (measured: same style, every stone somewhere else). Asked to
*colourise* a flat, shading-free render of the SAME image, it keeps every
stone in place — colourise, don't paint-over, when height must register to
albedo.

## 7. Lighting and camera

**Void/hero lighting**: one hard key (`SUN`, angle ≈ 0.9°), a large weak
fill tinted toward the key's complement, a cold rim so nothing dissolves
into the background. Shadows never fully black. **Camera on the key side** —
a hero angle from the shadow side is carried by fill and reads washed out.

**Clay/QA lighting** (three `SUN`s: key, rim, bounce from below) — the
bounce matters because half of any interior's surfaces face down (an
overhead console, a coaming's underside) and key+rim alone renders them as
unreadable black.

**Camera from the bounding box, never by hand** — hand-placed cameras end up
inside geometry, costing **80x render time** (near-field bounces: 166 s vs
2 s measured):
```python
pts = [o.matrix_world @ Vector(c) for o in meshes for c in o.bound_box]
lo = Vector((min(p[i] for p in pts) for i in range(3)))
hi = Vector((max(p[i] for p in pts) for i in range(3)))
ctr = (lo + hi) / 2; rad = max((p - ctr).length for p in pts)
cam.location = ctr + direction * (rad / math.tan(cam.data.angle / 2) * 1.05)
cam.rotation_euler = (ctr - cam.location).to_track_quat("-Z", "Y").to_euler()
```
`to_track_quat` assumes Z-up world; if the asset is authored Y-up inside
Blender's Z-up slots, build the look-at basis by hand (cross products off
the target vector and the game's own up axis) or every render is on its side.

**Voronoi stars, never thresholded noise** — noise can't separate density
from size (raise frequency to shrink points → thousands; widen the band to
brighten → falling snow). Voronoi: cell scale = how many, distance threshold
= how big. Cells over a sphere ≈ `4π·scale²`, a frame sees under 1% of it, so
`scale=30` puts ~15 cells in shot — use `scale ≈ 110`. Angular radius =
`threshold / scale`; move both together.

**Backdrop geometry must be camera-visible only.** A large emissive shell
(planet, skybox) hit by diffuse/glossy rays becomes an area light every
shading point importance-samples — measured **145 s → 4.3 s**:
```python
for o in (planet, atmo):
    o.visible_diffuse = o.visible_glossy = o.visible_transmission = False
    o.visible_volume_scatter = o.visible_shadow = False
```

## 8. Export contract for three.js

- **Join per material within each rigid assembly before export.** Keep moving
  doors/drawers, their attachment groups and required named parts separate;
  never merge them into the static carcass just because they share paint.
  One Blender object = one glTF node =
  one draw call. A loose 11-material ship export was 78 draws;
  `bpy.ops.object.join()` per material group brought it to ~11.
- **Metres, Y-up**: `bpy.ops.export_scene.gltf(export_format='GLB',
  use_selection=True, export_apply=True, export_yup=True)`. (The source game
  exports `export_yup=False` because its own runtime is Y-up-in-Blender's-
  Z-up-slots by convention — a plain three.js consumer wants `export_yup=True`.)
- **Flat base colours or baked textures only** — procedural nodes don't
  survive the round trip (§6). `KHR_materials_emissive_strength` DOES
  survive — nav lights, emissive panels keep authored intensity.
- **Draco for real triangle counts**: position 14-bit quantization is ~1 mm
  over a 16 m interior (a tenth of the smallest chamfer), normal 10-bit,
  texcoord 12-bit, compression level 6.
- **WebP out of Blender directly is lossless regardless of the quality
  argument** — its own quality slider is silently ignored. PNG-dump from
  Blender, encode to WebP with PIL on the host if you need real lossy quality.
- **Check draw calls after adding anything** — a duplicated kit piece is one
  draw call against a shared mesh no matter how many times placed; a fresh
  join is not.

## 9. Traps

- Bevel on bmesh-authored geometry does nothing (no shared edges) — weld
  first (§3). `o.scale` then Bevel makes pillows — apply scale first.
- `matrix_parent_inverse = parent.matrix_world.inverted()` cancels the
  parent transform (the "keep transform" idiom). Leave it at identity for
  the child to inherit the parent's rotation.
- A rotation about the wrong axis silently does nothing visible — a panel
  whose normal is +X doesn't change facing when rotated about X. Measure the
  world normal against the view vector rather than reasoning about it.
- Map Range with `To Min > To Max` and clamp on collapses to zero (clamps to
  an inverted interval) — invert with a `SUBTRACT` node instead.
- A Mix node in RGBA mode can silently drop a branch — several sockets share
  the name "Factor". Combine world contributions with two `Background` nodes
  into an `Add Shader` instead.
- The image preview downsamples — 4-px stars average away in a 1080p
  preview. Crop 1:1 and count bright pixels before concluding nothing rendered.
- A tangent-space NORMAL bake off a flat plane records nothing for vertical
  geometry — bake height by ray-traced Emission instead (§4).
- AO bakes along the surface normal — a kit skin wound facing away from the
  room bakes unoccluded everywhere.
- An AO map reaching pure black paints an unrecoverable dark line —
  floor-lift it (§4).
- Blender's WebP writer ignores its own quality setting, always lossless —
  PNG-dump and re-encode on the host (§8).
- Blender exits 0 even when the driven script raised — check stderr and the
  output file, not the return code (§2).
- A socket/exec service keeps Blender's *process* environment between calls
  — a default from a stale env var silently sends output into the wrong
  checkout. Assign output paths explicitly every call, never `setdefault`.

**Blender 5.x API changes** (4.x code fails on all of these):
- `Scene.node_tree` gone → `Scene.compositing_node_group`;
  `CompositorNodeComposite` no longer exists — the group's output socket IS
  the result.
- **The compositing group must contain a `CompositorNodeRLayers`.** Feeding
  it only from a Group Input means nothing depends on the render, so Blender
  skips rendering and writes a transparent black frame in 0.1 s. A
  suspiciously fast render is this bug.
- `Action.fcurves` is gone (slotted actions). Set
  `context.preferences.edit.keyframe_new_interpolation_type` *before*
  inserting keys.
- Glare/Lensdist settings moved from properties onto **sockets**; enums take
  display names (`"Fog Glow"`, `"Streaks"`, `"High"`), not old identifiers.
- Legacy addons still install to `~/Library/.../Blender/<ver>/scripts/addons/`
  on macOS — irrelevant on gex44, relevant for local proving.

## 10. Gates (measurable, not "looks right")

- **Independent export audit**: run
  `python3 scripts/audit_glb.py /absolute/path/asset.glb --strict` from this skill
  directory (requires numpy). It reports mesh-local triangles, nonfinite values,
  degenerate triangles, material groups and texture portability. Exit 1 means
  findings; exit 2 means invalid/unsupported input, never a clean bill of health.
  Audit uncompressed output before Draco/meshopt and inspect the compressed
  consumer separately. It does not validate winding, source solids, intersections,
  node-transformed placement, runtime draw calls or gameplay. Keep source meshes
  for topology/volume inspection; check transformed instance bounds in-game.
  The harbour correction's own empty issues list missed 16 zero-area triangles.

- **Rigged-asset rejection gates** (block the asset before it reaches a build; each one is a
  known failure class):
  - a character MAIN model still contains swappable gear (gear is separate parts on sockets);
  - action/animation files carry duplicate render meshes;
  - skeletons or bone names differ across actions of the same character;
  - a required role, socket (`target`, `ground`, `vfx-hit`, `vfx-death`, `attack-*`), collider,
    equipment-slot declaration or provenance field is absent;
  - toggling gear leaves visible fragments or holes without a declared underlayer boundary;
  - an attack animation has no authoritative timing and collision contract (see
    `_game-kit/core/ENEMY-CONTRACT.md`);
  - status language is truthful: `catalog-only` (recorded), `review-only` (inspector exists),
    `runtime` (gameplay loads it). Only `runtime` counts as shipped.
  Mechanical half: `audit_glb.py --rig --require-sockets target,ground,vfx-hit,vfx-death` reports
  skins, joint names, duplicate primitives (identical geometry buffers) and missing named nodes.
  Design after MengTo/Skills build-rigged-game-assets requirements (MIT); the human half stays a
  checklist.
- **Tone stats**: percentile clipping, e.g. "0.00% of pixels clip and the
  99th percentile is 165" — actionable; "looks flat" is not.
- **Contact sheets**: render every set-piece/angle into one grid image,
  judge the set at once rather than one screenshot at a time.
- **Clay check before any bake is trusted**: flat grey, hard key + rim +
  bounce, no textures, no emissives. A silhouette reading as a rectangle or
  an edge reading as infinitely sharp means the model isn't finished —
  textures and lighting hide box-stacking completely, flat clay does not.
- **Re-verify the capture isn't stale**: if the render/dev surface can
  hot-reload mid-capture, re-check the expected state is actually showing
  before saving, restart if not — a loading-state screenshot with a
  plausible number next to it is a silent false pass.
- **Draw-call and fps survey** after adding any asset: report draw count
  against the pre-change baseline (join-per-material should hold it flat)
  and frame time on the heaviest scene the asset appears in.
- **AO sanity**: print the raw bake's percentile spread (1st/10th/50th/90th)
  before floor-lifting — `min == 0` over a large area means winding or
  distance is wrong, not that floor-lift will fix it.
- Numbers not yet measured on gex44/RTX 4000 Ada (draft/final render time,
  bake time for a 4096 atlas): **unmeasured** — get one real run's numbers
  before writing them into a plan or a budget.

## Attribution

Distilled from TheLongSilence (MIT License, Copyright (c) 2026 Anshu
Chimala). Runnable reference code copied under the same license into
`reference/` — see `reference/INDEX.md`.

`reference/high-to-low-baking.md`, `baking-and-diagnostics.md`, `asset-delivery.md`,
`preflight-and-recovery.md` and `runtime-parity-and-diagnostics.md` are ported from
vercel-labs/vgpu `skills/vgpu/blender/references/` at commit 68cb1d8d198c (MIT License,
Copyright (c) 2025 Vercel, Inc.), adapted from vgpu/WebGPU to the three.js runtime.
`reference/critic-loop.md` is distilled from the same repository's asset agent flow.

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<!-- Ported from vercel-labs/vgpu skills/vgpu/blender/references/preflight-and-recovery.md at commit 68cb1d8d198c (MIT, Copyright (c) 2025 Vercel, Inc.). Adapted for Forge: three.js runtime instead of vgpu/WebGPU, links rerouted. Upstream text otherwise kept so a re-sync stays diffable. -->

# Preflight and Recovery

Use this workflow for long bakes and scripted asset delivery. Keep a short manual edit lightweight; add checkpoints where repeating expensive work or confusing stale output is a real risk. These are asset execution requirements, independent of how many people or agents perform the work.

## Exercise the actual execution path first

Before an expensive run, provide and run a task-local preflight command using the same executable, working directory, dependency environment and helper paths as the intended run. Reuse existing project checks where possible. A version query or import from another directory is not an execution probe.

- Start native Blender (gex44 path and GPU gate wrapper: `SKILL.md` §2) and execute a minimal scene operation through Python. For scripted runs, use `--python-exit-code 1`; inspect logs and the expected output, not exit status alone.
- Exercise the chosen render/bake device with a tiny representative bake, then export, encode/decode and import a small fixture through the actual exporter and runtime loader. Await codec initialization. Resolve copied Node helpers from their real execution directory and module mode; a successful ESM import does not establish that a copied CommonJS helper can resolve its dependencies.
- Classify required and optional inputs before baking. Verify required files, codecs, writable output paths and capture dependencies. Missing optional metadata must have a documented fallback or be omitted deliberately, not fail final assembly after a completed bake.
- Capture and read one real target-renderer frame with the intended browser/image tools. Record the actual backend; a fallback renderer does not validate the requested backend. This probe establishes that the tools work, not final visual quality.

If a probe fails, fix or report that boundary before starting dependent expensive work. Do not keep retrying the unchanged failure. If sources may change during a run, execute an immutable snapshot including local imports; record external dependencies and verify snapshot hashes at completion.

## Keep stages independently recoverable

Give expensive stages explicit commands, inputs, outputs and validation. A task-local script may expose subcommands or separate entry points; no particular build framework is required. Do not force a bake when that asset does not need one.

| Stage | Evidence needed before its outputs can be reused |
| --- | --- |
| Prepare | Saved source/LOW checkpoint, resolved transforms and reproducible parameters |
| Validate geometry | Openings, contacts, normals and UV checks on evaluated/exported LOW; simple-material views, including relevant LODs |
| Bake | Lossless masters, actual pass settings and dependency identities, coverage and representative pixel checks |
| Export | Decodable serialized meshes, map/UV bindings and measured counts; reconcile exporter changes with prepared geometry |
| Package | Required files, decoded texture error, channels/mips and delivery manifest with hashes |
| Verify runtime | Actual target-backend captures from matched cameras, independent map toggles, measured costs and renderer errors |

For each attempt, save the exact command, input/dependency hashes, tool identities, exit outcome, output hashes, validation results and failure reason. Mark a stage complete only after its outputs pass its checks. Keep failed attempts and logs distinct from completed checkpoints. File existence or a successful process alone is not proof of completion.

On retry, start at the earliest invalid stage and revalidate dependent outputs. If packaging fails after a verified bake/export, resume packaging from those artifacts; do not regenerate the scene merely to rerun a copy step. When geometry, normals or lighting change, use the [bake dependency rules](baking-and-diagnostics.md#reuse-bakes-by-their-dependencies) to decide which passes need new identities.

## Validate a candidate before replacing delivery assets

Keep candidate assets separate from the last working delivery. Verify the candidate manifest and served build/asset identities before capture; avoid a preview that silently loads missing files from the old asset set. Promote only the validated files together with their matching manifest, retain a recoverable previous version, and smoke-check the delivered URL after replacement. Report whether the replacement is atomic; per-file writes do not make the whole asset set atomic.

Checks establish structural and runtime evidence, not aesthetic acceptance. Pair them with the matched visual review in [the critic loop](critic-loop.md) and the gates in `SKILL.md` §10.
| --- | --- |
| A dense model must become a light one that keeps its look (normal + AO transfer) | [high-to-low baking](reference/high-to-low-baking.md) |
| Preparing UVs or a cage, or a bake shows seams, black faces, wrong highlights | [baking and diagnostics](reference/baking-and-diagnostics.md) |
| Choosing texture or mesh formats, or the asset is slow to load or heavy in GPU memory (KTX2, WebP, meshopt, Draco) | [asset delivery](reference/asset-delivery.md) |
| Before any long bake or scripted export pipeline | [preflight and recovery](reference/preflight-and-recovery.md) |
| The asset looks right in Blender and wrong in the game, or the cause could be either | [runtime parity and diagnostics](reference/runtime-parity-and-diagnostics.md) |
| The asset will be judged by eye (hero prop, character, building, environment) | [author and critic loop](reference/critic-loop.md) |
| Terrain, cliffs or rocks should look weathered (branching gullies and ridges, no simulation) | [terrain erosion](reference/terrain-erosion.md) |

These seven are loaded on demand, not by default. Five are ported from vercel-labs/vgpu (see Attribution); terrain erosion uses Rune Skovbo Johansen's filter (MPL 2.0, `scripts/erosion/`).

### Choose how to carry each detail before any bake

| Detail | Carry it as |
| --- | --- |
| Silhouette, openings, broad edges, tuft dimples, piping, moving parts | Real low-poly geometry |
| Fine bevel curvature and shallow relief the triangle budget cannot afford | Tangent-space normals baked from the dense source |
| Permanent cavities and contacts inside a rigid assembly | Baked AO |
| Fabric weave, grain, micro-texture | The existing tiled map at its own scale, never re-baked into a unique atlas |
| Contacts that change, directional shadows | Runtime lighting |

**Pick the cheapest carrier that passes the look check. Being under a texture budget is not a reason to
spend it.** A unique normal atlas is the last resort, for detail the triangle budget cannot hold: a
1024 px RGBA8 map with mips is 5.6 MB of GPU memory per asset, and it replaces a tiled map that every
copy of the material could have shared. If you try a bake and geometry plus the source's tiled maps
looks as good, ship the geometry and say so in the report.

Measured (2 Oct 2026, STRANDMON armchair, 233k to 12k triangles, two Astra runs, same brief): dimples kept
as geometry with the two original 256 px tiled maps = 0.46 MB download, 0.7 MB GPU textures. Same detail
baked into a unique 1152 px normal map = 1.19 MB download, 7.4 MB GPU textures, slightly closer from across
the room, slightly weaker up close, and a blind judge preferred the geometry version.

## Which representation: decide before modelling

For furniture reconstructed from photographs, datasheets or assembly instructions,
read [Furniture reconstruction checks](reference/furniture-reconstruction.md)
before generating geometry. It covers panel-relative coat-hook placement,
interior compartment counts and optional door/drawer articulation.

| Need | Representation | Why |
| --- | --- | --- |
| Hero or enemy character with a walk and attacks | imported rigged mesh (this skill, or the CC0 library: Quaternius, KayKit, Mixamo motions) | skinning, retargetable clips; procedural rigs read as mannequins |
| Weapon, prop, creature variant where silhouette, sockets, collision or code-driven variants matter | procedural three.js geometry or a small GLB kit part | controllable, cheap to vary per instance |
| Concept, icon, backdrop, card art | a generated 2D image used directly | never rebuilt as geometry |
| A reference image whose visible FORM must become a code model | `img2threejs` with its gates; say the result is a reconstruction, not extracted geometry | likeness is judged, not measured |

Pick once at the blueprint or stack-selection stage and record it with provenance (source, licence,
metres per unit, forward axis). Design after MengTo/Skills build-hybrid-game-assets (MIT).

## 1. The recipe

The concept image is the spec, not decoration. For every asset in a kit:

1. **Model every piece in Blender from the concept image** using loft/recess/
   greeble (§3). Grey-clay render it before touching a texture (§4, §10) —
   box-stacking hides under any lighting rig except flat grey + one hard key.
2. **Use a fitting registered photographic texture set or an image model** for
   photographic surfaces (ground, foliage, cloth). Record origin, license and
   physical scale; matching normal/roughness maps must remain aligned. Use an
   existing suitable licensed scan before generating a replacement; use Cycles nodes only for what
   genuinely varies by geometry (edge wear, per-plate tone), and flatten
   before export (§6).
3. **Screenshot-vs-concept loop.** Render next to the concept, same angle if
   possible, compare. Judge by measured numbers where you can (§10: tone
   percentiles, AO floor, draw calls), by eye where you can't (silhouette,
   chamfer read, material believability). Iterate until it reads as the
   concept, not until it "looks 3D".
4. **Export once clay AND texture both hold up.** A model that's flat-correct
   in clay but goes muddy after baking has a material bug, not a modelling
   bug — don't re-model to fix a bad bake.

## 2. Headless setup on gex44

Blender 5.2.0 LTS, x64, RTX 4000 Ada, at
`/root/blender-spike/blender-5.2.0-linux-x64/blender`.

**A. Direct subprocess** (matches the source game's `build_*.py` pattern):
```python
BLENDER = "/root/blender-spike/blender-5.2.0-linux-x64/blender"
cmd = [BLENDER, "--background", "--factory-startup", "--python-exit-code", "1", "--python", __file__,
       "--", "BUILD"] + extra_args
# script: `if 'BUILD' in sys.argv: blender_main(...)` else `drive(...)`
```
Split into `drive()` (host: subprocess + result check) and `blender_main()`
(only imports `bpy`/`bmesh` — importing them outside `-b` crashes with no
display). **Without `--python-exit-code 1`, Blender can exit 0 after a Python error.**
Set that flag, check the exit code and logs, and verify fresh output files.
Mesh/export validation still matters: a successful process is not visual proof.

**B. gex44 exec service** (`/opt/astra-blender/blender_exec_server.py`,
loopback `:8793`, token-guarded): POST a python script, get back stdout plus
render paths, for interactive iteration without a subprocess per call. Same
headless constraint — the script is a `blender_main`-shaped body, no GUI code.

Outputs land in the app's `public/models/` (or the GameKit pack's asset dir)
as `.glb` + `.webp`. Draft render: 64 samples / 1280x720 ≈ 2 s on an M-series
GPU (source game, Apple Silicon) — **gex44/RTX 4000 Ada timing is
unmeasured; get one real number before quoting a render budget.**

## 3. Modelling: loft, recess, greeble

Three techniques, in order of impact.

**Loft cross-sections, never stack primitives.**
```python
def oct_ring(w, h, cx, cz):
    a, b = w * 0.5, h * 0.5
    return [( a, b-cz), ( a-cx,  b), (-(a-cx),  b), (-a,  b-cz),
            (-a, -(b-cz)), (-(a-cx), -b), ( a-cx, -b), ( a, -(b-cz))]

def loft(name, sections, mat):    # sections: (y, w, h, cx, cz, dz)
    bm = bmesh.new()
    rings = [[bm.verts.new((x, y, z+dz)) for (x, z) in oct_ring(w, h, cx, cz)]
             for (y, w, h, cx, cz, dz) in sections]
    for A, B in zip(rings, rings[1:]):
        for i in range(8):
            j = (i+1) % 8
            bm.faces.new((A[i], A[j], B[j], B[i]))
    bm.faces.new(list(reversed(rings[0]))); bm.faces.new(rings[-1])
```
Keep the profile **stepped, not tapered** — a parallel midbody, a shoulder, a
blunt end. Steps are what the eye measures scale against.

**Cut detail into the skin**, not glued on top:
```python
sel = [f for f in bm.faces if pick(f)]
bmesh.ops.inset_region(bm, faces=sel, thickness=1.2, depth=0.0,
                       use_even_offset=True, use_boundary=True)
for f in sel:
    bmesh.ops.translate(bm, verts=list(f.verts), vec=f.normal.normalized()*-0.7)
    f.material_index = i_recess

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/bin/bash -lc 'for p in /home/claude-agent/forge-build /home/claude-agent/forge-build/forge-assets /home/claude-agent/forge-build/forge-assets/jobs; do if test -f "$p/AGENTS.md"; then cat "$p/AGENTS.md"; fi; done; date -u '"'+%F %T'; ssh gex44 'nvidia-smi --query-gpu=name,memory.free --format=csv,noheader; pgrep -af blender | head -5'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 713ms:
2026-10-11 16:11:52
NVIDIA RTX 4000 SFF Ada Generation, 13741 MiB
18867 python3 /opt/astra-blender/blender_exec_server.py
18880 python3 /opt/astra-blender/blender_exec_server.py
40540 bash -c cd /root/room-fit-pack/prop-lane && while pgrep -f blender >/dev/null 2>&1; do sleep 5; done; echo BLENDER_DONE; cat optimize_run7.log
87189 bash -c cd /root/room-fit-pack/prop-lane && while pgrep -f blender >/dev/null 2>&1; do sleep 4; done; echo BLENDER_DONE; cat optimize_run8.log
1160864 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --factory-startup --python-exit-code 1 --python /root/casa13-monster/manual_preview.py

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exec
/bin/bash -lc "ssh gex44 mkdir -p /root/fal-author/t55-tank-v1; python3 - <<'PY'
import urllib.request,json
x=json.load(urllib.request.urlopen('https://api.polyhaven.com/assets?t=textures'))
for k,v in x.items():
 if any(w in k for w in ['metal','rust','bark','rubber']): print(k)
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 1 in 795ms:
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "/usr/lib/python3.12/urllib/request.py", line 215, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/urllib/request.py", line 521, in open
    response = meth(req, response)
               ^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/urllib/request.py", line 630, in http_response
    response = self.parent.error(
               ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/urllib/request.py", line 559, in error
    return self._call_chain(*args)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/urllib/request.py", line 492, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
  File "/usr/lib/python3.12/urllib/request.py", line 639, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

codex
The reference’s key features are the very low glacis, broad cast turret, and exposed wheel-and-track profile. I’ll use five road wheels per side as requested—the sheet’s side view appears to omit one—and keep the fuel, stowage, fenders, and turret fittings separately removable.

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/bin/bash -lc "ssh gex44 \"curl -L -A 'Mozilla/5.0' -s 'https://api.polyhaven.com/assets?t=textures' -o /root/fal-author/t55-tank-v1/catalog.json\"; scp -q gex44:/root/fal-author/t55-tank-v1/catalog.json /tmp/t55-catalog.json; python3 - <<'PY'
import json
x=json.load(open('/tmp/t55-catalog.json'))
print('\\n'.join(k for k in x if any(w in k for w in ['metal','rust','bark','rubber'])))
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 2010ms:
bark_bluegum
bark_brown_01
bark_brown_02
bark_platanus
bark_willow
bark_willow_02
blue_metal_plate
box_profile_metal_sheet
chinese_cedar_bark
chinese_hackberry_bark
eucalyptus_bark
fever_tree_bark
green_metal_rust
japanese_camphor_bark
japanese_cedar_bark
japanese_hackberry_bark
japanese_zelkova_bark
jolcham_oak_bark_01
knotted_pine_bark
metal_grate_rusty
metal_plate
metal_plate_02
metasequoia_bark
painted_metal_shutter
palm_bark
palm_tree_bark
pine_bark
rubber_tiles
rubberized_track
rust_coarse_01
rusted_shutter
rustic_stone_wall
rustic_stone_wall_02
rusty_corrugated_iron
rusty_metal
rusty_metal_02
rusty_metal_03
rusty_metal_04
rusty_metal_05
rusty_metal_grid
rusty_metal_sheet
rusty_metal_shutter
rusty_painted_metal
sakura_bark
tree_bark_03
trident_maple_bark

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/bin/bash -lc "cat > build_t55-tank.py <<'PY'
import bpy, math, os, json, random, urllib.request, struct, sys
from mathutils import Vector, Matrix
from pathlib import Path
from math import sin, cos, pi
ROOT=Path(__file__).resolve().parent
os.chdir(ROOT); random.seed(55)
bpy.ops.object.select_all(action='SELECT'); bpy.ops.object.delete(use_global=False)
S=bpy.context.scene
S.render.engine='CYCLES'; S.cycles.samples=24; S.cycles.use_denoising=True
prefs=bpy.context.preferences.addons['cycles'].preferences
prefs.compute_device_type='OPTIX'; prefs.get_devices()
for d in prefs.devices: d.use=d.type"'!='"'CPU'
S.cycles.device='GPU'; S.render.image_settings.file_format='PNG'
S.world.color=(.25,.25,.25)
texdir=ROOT/'textures'; texdir.mkdir(exist_ok=True)
IDS=['green_metal_rust','rusty_metal','rubberized_track','bark_brown_02']
def download(id,mp):
 p=texdir/f'{id}_{mp}_1k.jpg'
 if not p.exists():
  url=f'https://dl.polyhaven.org/file/ph-assets/Textures/jpg/1k/{id}/{id}_{mp}_1k.jpg'
  req=urllib.request.Request(url,headers={'User-Agent':'Mozilla/5.0'})
  with urllib.request.urlopen(req) as r: p.write_bytes(r.read())
 return str(p)
for id in IDS:
 for mp in ['diff','nor_gl','arm']: download(id,mp)

def node(mat,typ):return mat.node_tree.nodes.new(typ)
def link(mat,a,out,b,inp):mat.node_tree.links.new(a.outputs[out],b.inputs[inp])
def image_node(m,path,non=False):
 n=node(m,'ShaderNodeTexImage'); n.image=bpy.data.images.load(path,check_existing=True)
 if non:n.image.colorspace_settings.name='Non-Color'
 return n
# Bake reusable tile materials on a UV plane. No runtime procedural nodes.
M={}
recipes=[('Paint','green_metal_rust',(.87,.87,.87),.12,.78),('Rubber','rubberized_track',(.025,.027,.025),.0,.9),('TrackSteel','rusty_metal',(.12,.105,.085),.65,.79),('Metal','rusty_metal',(.12,.13,.12),.72,.55),('Canvas','rubberized_track',(.19,.15,.10),0,.95),('Wood','bark_brown_02',(.24,.16,.09),0,.88),('Lamps','green_metal_rust',(.16,.19,.16),.3,.24),('Interior','rusty_metal',(.012,.015,.013),0,.98),('Burnt','rusty_metal',(.075,.065,.055),.35,.94),('Scars','rusty_metal',(.19,.18,.16),.7,.65)]
for name,id,col,metal,rough in recipes:
 m=bpy.data.materials.new(name+'_source');m.use_nodes=True
 nt=m.node_tree;nt.nodes.clear();out=node(m,'ShaderNodeOutputMaterial'); bs=node(m,'ShaderNodeBsdfPrincipled');link(m,bs,'BSDF',out,'Surface')
 diff=image_node(m,download(id,'diff'));bw=node(m,'ShaderNodeRGBToBW');link(m,diff,'Color',bw,'Color')
 ramp=node(m,'ShaderNodeValToRGB');link(m,bw,'Val',ramp,'Fac')
 ramp.color_ramp.elements[0].position=.08;ramp.color_ramp.elements[1].position=.7
 if name=='Paint':
  ramp.color_ramp.elements[0].color=(.38,.38,.38,1);ramp.color_ramp.elements[1].color=(.91,.91,.91,1)
 else:
  ramp.color_ramp.elements[0].color=tuple(c*.35 for c in col)+(1,);ramp.color_ramp.elements[1].color=tuple(min(1,c*1.65) for c in col)+(1,)
 noise=node(m,'ShaderNodeTexNoise');noise.inputs['Scale'].default_value=145;noise.inputs['Detail'].default_value=3
 mix=node(m,'ShaderNodeMixRGB');mix.blend_type='MULTIPLY';mix.inputs[0].default_value=.18;link(m,ramp,'Color',mix,1);link(m,noise,'Fac',mix,2)
 link(m,mix,'Color',bs,'Base Color');bs.inputs['Metallic'].default_value=metal;bs.inputs['Roughness'].default_value=rough
 norm=image_node(m,download(id,'nor_gl'),True);nn=node(m,'ShaderNodeNormalMap');nn.inputs['Strength'].default_value=.32;link(m,norm,'Color',nn,'Color')
 bump=node(m,'ShaderNodeBump');bump.inputs['Strength'].default_value=.2;bump.inputs['Distance'].default_value=.0018;link(m,noise,'Fac',bump,'Height');link(m,nn,'Normal',bump,'Normal');link(m,bump,'Normal',bs,'Normal')
 bpy.ops.mesh.primitive_plane_add(size=2);p=bpy.context.object;p.data.materials.append(m)
 maps={}
 for mode,size in [('Base',1024 if name=='Paint' else 512),('Normal',512),('ORM',512)]:
  im=bpy.data.images.new(name+'_'+mode,width=size,height=size,alpha=False);im.filepath_raw=str(texdir/(name+'_'+mode+'.png'));im.file_format='PNG'
  if mode"'!='"'Base':im.colorspace_settings.name='Non-Color'
  target=node(m,'ShaderNodeTexImage');target.image=im;nt.nodes.active=target
  S.cycles.samples=8
  if mode=='Normal':
   link(m,bs,'BSDF',out,'Surface');bpy.ops.object.bake(type='NORMAL',margin=8)
  else:
   em=node(m,'ShaderNodeEmission')
   if mode=='Base':link(m,mix,'Color',em,'Color')
   else:
    comb=node(m,'ShaderNodeCombineColor');comb.inputs[0].default_value=1;comb.inputs[1].default_value=rough;comb.inputs[2].default_value=metal;link(m,comb,'Color',em,'Color')
   link(m,em,'Emission',out,'Surface');bpy.ops.object.bake(type='EMIT',margin=8)
  im.save();maps[mode]=im
 bpy.data.objects.remove(p,do_unlink=True);bpy.data.materials.remove(m)
 m=bpy.data.materials.new(name);m.use_nodes=True;bs=m.node_tree.nodes.get('Principled BSDF')
 n=node(m,'ShaderNodeTexImage');n.image=maps['Base'];link(m,n,'Color',bs,'Base Color')
 n=node(m,'ShaderNodeTexImage');n.image=maps['Normal'];nn=node(m,'ShaderNodeNormalMap');link(m,n,'Color',nn,'Color');link(m,nn,'Normal',bs,'Normal')
 n=node(m,'ShaderNodeTexImage');n.image=maps['ORM'];sep=node(m,'ShaderNodeSeparateColor');link(m,n,'Color',sep,'Color');link(m,sep,'Green',bs,'Roughness');link(m,sep,'Blue',bs,'Metallic')
 # glTF's occlusion socket convention
 group=bpy.data.node_groups.get('glTF Material Output')
 if not group:
  group=bpy.data.node_groups.new('glTF Material Output','ShaderNodeTree');group.interface.new_socket(name='Occlusion',in_out='INPUT',socket_type='NodeSocketFloat')
 gn=node(m,'ShaderNodeGroup');gn.node_tree=group;link(m,sep,'Red',gn,'Occlusion')
 M[name]=m
 print('BAKED',name,flush=True)
S.cycles.samples=24

# Geometry created in Z-up: front is -Y, tank left +X. Mesh origins are set without applying moving-node transforms.
def matobj(o,mat):o.data.materials.append(M[mat]);return o
def apply(o):
 bpy.context.view_layer.objects.active=o;o.select_set(True)
 for mod in list(o.modifiers):bpy.ops.object.modifier_apply(modifier=mod.name)
 bpy.ops.object.transform_apply(location=False,rotation=True,scale=True);o.select_set(False)
 return o
def bevel(o,w=.012,seg=2):
 mod=o.modifiers.new('Machined edge radius','BEVEL');mod.width=w;mod.segments=seg
 return o
def box(loc,dim,mat='Paint',bev=.012):
 bpy.ops.mesh.primitive_cube_add(size=1,location=loc);o=bpy.context.object;o.dimensions=dim
 bpy.ops.object.transform_apply(location=False,rotation=False,scale=True)
 if bev:bevel(o,bev)
 return matobj(o,mat)
def cyl(loc,r,depth,mat='Paint',axis='Z',verts=32,r2=None):
 if r2 is None:bpy.ops.mesh.primitive_cylinder_add(vertices=verts,radius=r,depth=depth,location=loc)
 else:bpy.ops.mesh.primitive_cone_add(vertices=verts,radius1=r,radius2=r2,depth=depth,location=loc)
 o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 bevel(o,.005,2);matobj(o,mat)
 for f in o.data.polygons:f.use_smooth=len(f.vertices)==4
 return o
def uvball(loc,scale,mat='Paint',seg=32,rings=16):
 bpy.ops.mesh.primitive_uv_sphere_add(segments=seg,ring_count=rings,radius=1,location=loc);o=bpy.context.object;o.scale=scale
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def mesh(name,vs,fs,mat='Paint',smooth=False):
 me=bpy.data.meshes.new(name);me.from_pydata(vs,[],fs);me.update();o=bpy.data.objects.new(name,me);bpy.context.collection.objects.link(o);matobj(o,mat)
 for f in me.polygons:f.use_smooth=smooth
 return o
def tube(points,r=.012,mat='Paint',n=8):
 cu=bpy.data.curves.new('formed tube','CURVE');cu.dimensions='3D';cu.resolution_u=1;cu.bevel_depth=r;cu.bevel_resolution=1;cu.resolution_u=1
 sp=cu.splines.new('POLY');sp.points.add(len(points)-1)
 for v,p in zip(sp.points,points):v.co=(*p,1)
 o=bpy.data.objects.new('tube',cu);bpy.context.collection.objects.link(o);o.data.materials.append(M[mat]);bpy.context.view_layer.objects.active=o;o.select_set(True);bpy.ops.object.convert(target='MESH');o.select_set(False);return o
def ring(loc,r,minor=.014,mat='Paint',axis='Z',seg=48):
 bpy.ops.mesh.primitive_torus_add(major_segments=seg,minor_segments=6,location=loc,major_radius=r,minor_radius=minor);o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def bolt(loc,axis='Z',r=.018,mat='Metal'):return cyl(loc,r,.014,mat,axis,6)
def join(objs,name,pivot=(0,0,0),parent=None):
 objs=[o for o in objs if o]
 bpy.ops.object.select_all(action='DESELECT')
 for o in objs:apply(o)
 for o in objs:o.select_set(True)
 bpy.context.view_layer.objects.active=objs[0];bpy.ops.object.join();o=bpy.context.object;o.name=name
 # Move mesh to desired pivot while retaining world coordinates.
 wm=o.matrix_world.copy(); inv=Matrix.Translation(Vector(pivot)).inverted()
 o.data.transform(inv@wm);o.matrix_world=Matrix.Translation(Vector(pivot))
 # World-scale planar UVs on each face, preserving existing UVs is not needed except track override below.
 uv=o.data.uv_layers.active or o.data.uv_layers.new(name='UVMap')
 for f in o.data.polygons:
  no=f.normal;ax=max(range(3),key=lambda i:abs(no[i]));ij=[i for i in range(3) if i"'!=ax]
  for li in f.loop_indices:
   co=o.data.vertices[o.data.loops[li].vertex_index].co+Vector(pivot);uv.data[li].uv=(co[ij[0]]*.75,co[ij[1]]*.75)
 if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm
 o.select_set(False);return o
def empty(name,pos,parent=None):
 o=bpy.data.objects.new(name,None);bpy.context.collection.objects.link(o);o.location=pos
 if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm
 return o
parts=[];wheels=[];hatches=[]
def part(name,objs,parent=None):
 # Surface-volume centroid approximation defines throwable item'"'s independent origin.
 bpy.context.view_layer.update();cen=sum((o.matrix_world.translation for o in objs),Vector())/len(objs)
 o=join(objs,'Part_'+name,cen,parent);parts.append(o);return o
# Low welded hull with genuine sloping armour.
profile=[(-3.225,.65,1.10),(-3.12,1.20,1.35),(-2.24,1.48,1.37),(2.75,1.48,1.37),(3.225,1.15,1.15),(3.1,.43,1.04),(-2.82,.43,1.04)]
vs=[(s*w,y,z) for s in [-1,1] for y,z,w in profile];N=len(profile)
fs=[tuple(range(N-1,-1,-1)),tuple(range(N,2*N))]+[(i,(i+1)%N,(i+1)%N+N,i+N) for i in range(N)]
hullbits=[bevel(mesh('armoured monocoque',vs,fs),.022),cyl((0,-.3,1.485),1.025,.075,'Metal',verts=64)]
# Weld seams, towing lugs, final-drive housings, suspension arms.
for s in [-1,1]:
 hullbits+=[tube([(s*1.31,-2.34,1.475),(s*1.31,2.7,1.475)],.009,'Metal')]
 for y in [-2.05,-.79,.2,1.19,2.18]:
  hullbits+=[cyl((s*1.075,y,.69),.13,.23,'Metal','X'),tube([(s*1.13,y+.16,.81),(s*1.25,y,.61)],.065,'Metal')]
 for y in [-2.98,2.97]:
  hullbits+=[ring((s*.8,y,.91),.072,.024,'Metal','Y'),box((s*.8,y,.9),(.16,.07,.2))]
 for y in [-2.4,-1.3,0,1.3,2.5]:
  hullbits+=[box((s*1.34,y,1.4),(.12,.17,.12)),bolt((s*1.415,y,1.42),'X')]
# Front spare mounting bosses and driving lamps.
for x in [-.95,.95]:
 for y,z in [(-2.88,1.285),(-2.45,1.44)]:hullbits.append(bolt((x,y,z)))
for x in [-.99,.99]:
 hullbits += [cyl((x,-2.40,1.56),.095,.15,'Metal','Y'),cyl((x,-2.485,1.56),.076,.008,'Lamps','Y')]
hull=join(hullbits,'Hull')
# Cast dome: elliptical rings with asymmetric fore-aft radii, thick closed base.
T=(0,-.28,1.51);v=[];f=[]
levels=[(0,1.13,1.24),(.06,1.20,1.32),(.18,1.205,1.31),(.39,1.14,1.24),(.61,1.01,1.10),(.77,.80,.85),(.86,.49,.56),(.885,.08,.12)]
for j,(z,rx,ry) in enumerate(levels):
 for k in range(64):
  a=2*pi*k/64;v.append((rx*cos(a),T[1]+ry*sin(a)+.075*z,T[2]+z))
for j in range(len(levels)-1):
 for k in range(64):a=j*64+k;b=j*64+(k+1)%64;f.append((a,b,b+64,a+64))
f += [tuple(range(63,-1,-1)),tuple((len(levels)-1)*64+k for k in range(64))]
tbits=[mesh('cast turret',v,f,smooth=True),ring((0,-.28,1.53),1.10,.028,'Metal',seg=64)]
# Cast seam, welded grab rails, lifting eyes.
for s in [-1,1]:
 tbits += [tube([(s*1.07,-.88,1.96),(s*1.18,-.60,1.91),(s*1.21,-.1,1.90),(s*1.18,.12,1.94)],.018),tube([(s*1.1,.3,1.91),(s*1.08,.58,1.94),(s*.87,.83,2.00)],.018)]
 for y in [-.8,.62]:tbits += [ring((s*.84,y,2.11),.046,.015,'Metal','X')]
turret=join(tbits,'Turret',T)
G=(0,-1.44,1.94)
gun=join([box((0,-1.41,1.95),(.64,.34,.53),'Canvas',.10),cyl((0,-1.62,1.94),.225,.18,'Canvas','Y'),ring((0,-1.721,1.94),.17,.018,'Canvas','Y')],'Gun',G,turret)
# Hollow open-bore barrel as revolved profile; bore cavity continues 0.5m deep.
B=(0,-1.72,1.94)
barprof=[(-1.72,.118),(-1.92,.114),(-4.86,.070),(-4.89,.099),(-5.39,.099),(-5.43,.073),(-5.73,.073),(-5.775,.071),(-5.775,.050),(-5.25,.050)]
v=[];f=[]
for y,r in barprof:
 for k in range(48):a=2*pi*k/48;v.append((r*cos(a),y,1.94+r*sin(a)))
for j in range(len(barprof)-1):
 for k in range(48):a=j*48+k;b=j*48+(k+1)%48;f.append((a,b,b+48,a+48))
barrel=join([mesh('barrel turned steel',v,f,smooth=True),ring((0,-5.41,1.94),.098,.008,'Metal','Y'),ring((0,-4.88,1.94),.099,.006,'Metal','Y')],'Barrel',B,gun)
empty('Muzzle',(0,-5.775,1.94),barrel)
# Wheels: rubber tyres, dished hub, ten recessed windows separated by tapered radial webs.
for s,side in [(1,'L'),(-1,'R')]:
 for wi,y in enumerate([-2.06,-.80,.19,1.18,2.17]):
  z=.57;bits=[]
  for off in [-.115,.115]:
   x=s*(1.32+off);bits += [cyl((x,y,z),.488,.10,'Rubber','X',64),cyl((x+s*.053,y,z),.413,.025,'Paint','X',64),cyl((x+s*.069,y,z),.343,.008,'Interior','X',48),ring((x+s*.073,y,z),.385,.028,'Paint','X',64)]
  x=s*1.52
  for k in range(10):
   a=2*pi*k/10
   ob=box((x,y+.235*sin(a),z+.235*cos(a)),(.05,.082,.27),'Paint',.018);ob.rotation_euler[0]=-a;bits.append(ob)
  bits += [cyl((s*1.53,y,z),.145,.105,'Paint','X',32),cyl((s*1.59,y,z),.088,.012,'Metal','X',24)]
  for k in range(6):a=2*pi*k/6;bits += [bolt((s*1.592,y+.112*sin(a),z+.112*cos(a)),'X',.013)]
  wheels.append(join(bits,f'Wheel_{side}{wi+1}',(s*1.32,y,z)))
 for ind,y in [(6,-2.79),(7,2.79)]:
  z=.80;bits=[cyl((s*1.33,y,z),.345,.26,'Metal','X',48),cyl((s*1.51,y,z),.25,.038,'Interior','X',40),ring((s*1.55,y,z),.31,.030,'Paint','X'),cyl((s*1.56,y,z),.105,.065,'Paint','X')]
  for k in range(12):
   a=2*pi*k/12;ob=box((s*1.54,y+.222*sin(a),z+.222*cos(a)),(.045,.055,.19),'Paint',.009);ob.rotation_euler[0]=-a;bits.append(ob)
   if ind==7:
    ob=box((s*1.34,y+.36*sin(a),z+.36*cos(a)),(.30,.095,.10),'Metal',.012);ob.rotation_euler[0]=-a;bits.append(ob)
  wheels.append(join(bits,f'Wheel_{side}{ind}',(s*1.32,y,z)))
# Tread path: five-wheel bottom contact and wrap around front/rear idler.
path=[]
for i in range(48):
 t=i/48;path.append((-2.18+4.36*t,.065))
for i in range(26):
 a=-pi/2+pi*i/26;path.append((2.62+.52*cos(a),.585+.52*sin(a)))
for i in range(55):
 t=i/55;path.append((2.62-5.24*t,1.105-.055*sin(pi*t)))
for i in range(26):
 a=pi/2+pi*i/26;path.append((-2.62+.52*cos(a),.585+.52*sin(a)))
# Resample equal distance link pitch.
lens=[0]
for i in range(len(path)):a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);lens.append(lens[-1]+(b-a).length)
def sample(t):
 d=(t%1)*lens[-1]
 for i in range(len(path)):
  if lens[i+1]>=d:
   a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);p=a.lerp(b,(d-lens[i])/(lens[i+1]-lens[i]));q=(b-a).normalized();return p,q
tracks=[]
for s,side in [(1,'L'),(-1,'R')]:
 bits=[]
 for i in range(96):
  p,q=sample(i/96);y,z=p;ang=math.atan2(q[1],q[0]);x=s*1.34
  ob=box((x,y,z),(.59,.125,.054),'TrackSteel',.008);ob.rotation_euler[0]=ang;bits.append(ob)
  normal=Vector((-q[1],q[0]))
  for off in [-.18,.18]:
   ob=box((x+off,y-normal[0]*.035,z-normal[1]*.035),(.20,.045,.023),'TrackSteel',.005);ob.rotation_euler[0]=ang;bits.append(ob)
  # Center guide horn faces inwards.
  ob=box((x,y+normal[0]*.065,z+normal[1]*.065),(.045,.07,.10),'Metal',.01);ob.rotation_euler[0]=ang;bits.append(ob)
  bits += [cyl((x+s*.30,y,z),.023,.028,'Metal','X',8)]
 tr=join(bits,'Track_'+side)
 uv=tr.data.uv_layers.active
 # V increases monotonically along nearest track-loop station; width is U.
 for f in tr.data.polygons:
  for li in f.loop_indices:
   co=tr.data.vertices[tr.data.loops[li].vertex_index].co
   idx=min(range(96),key=lambda j:(Vector((co.y,co.z))-sample(j/96)[0]).length_squared)
   uv.data[li].uv=((co.x-s*1.34)/.59+.5,idx/96)
 tracks.append(tr)
# Sectioned fenders, rolled lips and pressed ribs. No skirts on the T-55.
for s,side in [(1,'L'),(-1,'R')]:
 for end,ya,yb in [('F',-3.18,-.05),('R',-.02,3.20)]:
  bits=[box((s*1.38,(ya+yb)/2,1.31),(.51,yb-ya,.052),'Paint',.022),tube([(s*1.63,ya,1.30),(s*1.63,yb,1.30)],.018)]
  # sloping curved mudguard at end
  ys=[-3.22,-3.13,-2.99,-2.78] if end=='F' else [2.78,2.99,3.13,3.22]
  zs=[.93,1.14,1.28,1.32] if end=='F' else [1.32,1.28,1.14,.93]
  v=[(s*x,y,z) for x in [1.11,1.635] for y,z in zip(ys,zs)]
  ob=mesh('pressed mudguard',v,[(i,i+1,i+5,i+4) for i in range(3)])
  so=ob.modifiers.new('sheet thickness','SOLIDIFY');so.thickness=.022;bevel(ob,.012);bits.append(ob)
  for x in [1.20,1.48,1.57]:bits.append(tube([(s*x,y,z+.015) for y,z in zip(ys,zs)],.009))
  part('Fender_'+end+side,bits)
 # brackets remain behind removed stowage.
 for y in [-1.65,.1,1.85]:
  bs=[box((s*1.41,y,1.445),(.42,.91,.25),'Paint',.022),box((s*1.41,y,1.59),(.445,.935,.035),'Paint',.01)]
  for yy in [y-.32,y+.32]:bs += [box((s*1.64,yy,1.49),(.024,.055,.12),'Metal',.004),bolt((s*1.657,yy,1.49),'X',.013)]
  part(('FuelCell_R' if s==-1 else 'Stowage_L')+str(round((y+2)*10)),bs)
  # retain mounting shoes on actual hull
  pad=join([box((s*1.27,y,1.34),(.19,.76,.048)),bolt((s*1.31,y,1.38))],'mount')
  hull=join([hull,pad],'Hull')
 for x in [s*.99]:
  part('LampGuard_'+side,[tube([(x-.125,-2.56,1.49),(x-.125,-2.55,1.71),(x+.125,-2.55,1.71),(x+.125,-2.56,1.49)],.012),tube([(x,-2.56,1.49),(x,-2.55,1.71)],.008)])
# Rear fuel drums (axes fore/aft), rolled seams, straps and supply line.
for i,x in enumerate([-.66,.66]):
 bits=[cyl((x,2.77,1.66),.29,.80,'Paint','Y',48)]
 for y in [2.37,2.43,2.64,2.91,3.11,3.17]:bits.append(ring((x,y,1.66),.29,.012,'Metal' if y in [2.64,2.91] else 'Paint','Y'))
 bits += [cyl((x,3.185,1.66),.263,.015,'Paint','Y',48),cyl((x+.13,3.20,1.79),.025,.025,'Metal','Y',12)]
 part('FuelDrum_'+str(i+1),bits)
 # permanently fixed drum cradle
 hull=join([hull,box((x,2.7,1.385),(.45,.65,.10)),tube([(x-.24,2.46,1.43),(x-.30,2.46,1.66)],.018)],'Hull')
part('UnditchingBeam',[cyl((0,3.14,1.08),.11,2.72,'Wood','X',24),box((-.93,3.16,1.08),(.07,.245,.26),'Metal'),box((.93,3.16,1.08),(.07,.245,.26),'Metal')])
part('Snorkel',[cyl((0,2.38,1.76),.09,2.60,'Paint','X'),ring((-.93,2.38,1.76),.096,.012,'Metal','X'),ring((.93,2.38,1.76),.096,.012,'Metal','X')])
# Radiator shutters and deck panel borders.
for x in [-.64,.64]:
 bits=[box((x,1.61,1.502),(.94,.90,.045),'Metal')]
 for j in range(12):bits.append(box((x,1.22+j*.068,1.533),(.85,.034,.034),'Paint',.006))
 for xx in [x-.44,x+.44]:
  for yy in [1.19,2.04]:bits.append(bolt((xx,yy,1.55)))
 part('EngineGrille_'+('L' if x>0 else 'R'),bits)
part('ExhaustShroud',[box((1.41,2.45,1.48),(.46,.57,.28),'Metal',.025),box((1.665,2.45,1.47),(.026,.41,.13),'Interior',.008),tube([(1.63,2.14,1.58),(1.67,2.14,1.63),(1.67,2.75,1.63),(1.63,2.75,1.58)],.012)])
# Tow cable laid across frontal glacis, loop eyes at the ends.
part('TowCable',[tube([(-.90,-2.83,1.28),(-1.1,-2.64,1.4),(-.98,-2.39,1.5),(-.4,-2.3,1.51),(.35,-2.3,1.51),(.94,-2.45,1.43),(1.02,-2.74,1.32)],.021,'Metal'),ring((-.88,-2.88,1.28),.068,.02,'Metal'),ring((1.0,-2.83,1.28),.068,.02,'Metal')])
part('Tools',[tube([(1.4,-.72,1.66),(1.4,.55,1.66)],.02,'Wood'),box((1.4,.65,1.65),(.23,.29,.042),'Metal',.04),tube([(1.52,-.67,1.66),(1.52,.4,1.66)],.018,'Metal')])
part('SpareLinks',[box((x,-3.08,1.10),(.32,.09,.23),'TrackSteel',.01) for x in [-.5,-.16,.18,.52]])
# Hatches with dark cupped wells, raised coamings and hinge pins.
for name,pos,r,parent in [('Commander',(.49,-.12,2.35),.295,turret),('Loader',(-.47,-.05,2.33),.29,turret),('Driver',(.58,-2.14,1.48),.245,None)]:
 x,y,z=pos
 # visible coaming conceals solid dome beneath, closed hatch over dark modeled cup.
 well=join([cyl((x,y,z-.08),r*.86,.12,'Interior'),ring((x,y,z),r,.022,'Paint')],name+'_well',pos,parent)
 if parent:turretbits=None
 else:hull=join([hull,well],'Hull')
 if parent:
  # merge well into turret without disturbing pivot or existing children
  children=list(turret.children); mats=[(c,c.matrix_world.copy()) for c in children]
  turret=join([turret,well],'Turret',T)
  for c,wm in mats:c.parent=turret;c.matrix_world=wm
 bits=[cyl((x,y,z+.025),r,.045,'Paint',verts=48),tube([(x-.07,y,z+.064),(x-.07,y+.045,z+.105),(x+.07,y+.045,z+.105),(x+.07,y,z+.064)],.012),cyl((x,y+.9*r,z+.018),.032,r*1.3,'Metal','X')]
 h=join(bits,'Hatch_'+name,(x,y+.9*r,z+.018),parent);hatches.append(h)
 if name=='Commander':
  part('Turret_Cupola',[ring((x,y,z-.015),r+.055,.035),*[bolt((x+(r+.055)*cos(k*pi/8),y+(r+.055)*sin(k*pi/8),z+.012),r=.012) for k in range(16)]],turret)
# IR lamp beside gun, periscopes and antenna.
part('Turret_IRSearchlight',[cyl((.66,-1.2,2.22),.175,.17,'Paint','Y',48),cyl((.66,-1.291,2.22),.147,.012,'Lamps','Y',48),ring((.66,-1.30,2.22),.165,.014,'Metal','Y'),box((.66,-1.15,2.04),(.12,.10,.16))],turret)
for side,x in [('L',.62),('R',-.62)]:
 part('Turret_Sight_'+side,[box((x,-.55,2.34),(.22,.18,.14),'Paint',.025),box((x,-.651,2.35),(.15,.012,.053),'Lamps',.007)],turret)
part('Turret_Antenna',[cyl((-.82,.40,2.18),.065,.10,'Rubber'),tube([(-.82,.40,2.22),(-.82,.40,3.10)],.006,'Metal')],turret)
# DShK receiver, finned barrel, gas tube, spade grips, ammo box, articulated pintle.
mgp=(.50,-.1,2.40)
bits=[cyl(mgp,.037,.22,'Metal'),box((.5,-.22,2.58),(.15,.42,.14),'Metal',.012),cyl((.5,-.74,2.60),.028,.65,'Metal','Y'),cyl((.5,-1.105,2.60),.043,.10,'Metal','Y'),cyl((.5,-.70,2.535),.018,.44,'Metal','Y'),box((.34,-.22,2.54),(.19,.23,.22),'Paint'),tube([(.43,-.06,2.58),(.40,.13,2.61),(.4,.19,2.54)],.015,'Metal'),tube([(.57,-.06,2.58),(.60,.13,2.61),(.6,.19,2.54)],.015,'Metal'),ring((.5,-.92,2.67),.036,.008,'Metal','Y')]
for y in [-.46-i*.028 for i in range(15)]:bits.append(ring((.5,y,2.60),.029,.006,'Metal','Y',24))
mg=join(bits,'MG',mgp,turret)
for name,pos,par in [('Seat_Commander',(.49,-.12,2.45),turret),('Seat_Driver',(.58,-2.14,1.68),None),('Exhaust',(1.64,2.45,1.47),None),('Light_Head_L',(.99,-2.49,1.56),None),('Light_Head_R',(-.99,-2.49,1.56),None),('Fx_Engine',(0,1.6,1.55),None),('Fx_Ammo',(0,0,.85),None),('Fx_Hatch',(.49,-.12,2.42),turret)]:empty(name,pos,par)
# Sort wheel nodes front to rear (idler is foremost, then 5 roadwheels, then sprocket).
for side in ['L','R']:
 ww=sorted([o for o in wheels if o.name.startswith('Wheel_'+side)],key=lambda o:o.location.y)
 for i,o in enumerate(ww):o.name='tmp_'+side+str(i)
 for i,o in enumerate(ww):o.name='Wheel_'+side+str(i+1)
healthy=list(bpy.context.scene.objects)
# Ensure parent matrices evaluated before geometry copies.
bpy.context.view_layer.update()
def tri_count(objs):return sum(sum(len(p.vertices)-2 for p in o.data.polygons) for o in objs if o.type=='MESH')
print('HEALTHY_TRIANGLES',tri_count(healthy),flush=True)
# Export supports external Paint factor, patched at serialization for strict glTF compliance.
PAINTS=[('Olive drab',[.11,.14,.08]),('NATO green',[.075,.115,.068]),('Desert tan',[.48,.36,.21]),('Field grey',[.18,.21,.18]),('Winter white',[.73,.76,.72]),('Dark green-black',[.028,.043,.030])]
def patch_glb(path):
 b=Path(path).read_bytes();n,typ=struct.unpack_from('<II',b,12);j=json.loads(b[20:20+n]);tail=b[20+n:]
 for m in j.get('materials',[]):
  if m['name']=='Paint':m['pbrMetallicRoughness']['baseColorFactor']=PAINTS[0][1]+[1]
 raw=json.dumps(j,separators=(',',':')).encode();raw+=b' '*((-len(raw))%4)
 Path(path).write_bytes(struct.pack('<4sII',b'glTF',2,20+len(raw)+len(tail))+struct.pack('<II',len(raw),0x4E4F534A)+raw+tail)
 return j
def export(objs,path):
 bpy.ops.object.select_all(action='DESELECT')
 for o in objs:o.select_set(True)
 bpy.ops.export_scene.gltf(filepath=str(ROOT/path),export_format='GLB',use_selection=True,export_yup=True,export_apply=True,export_texcoords=True,export_normals=True,export_materials='EXPORT',export_image_format='AUTO',export_cameras=False,export_lights=False,export_extras=True)
 return patch_glb(ROOT/path)
ja=export(healthy,'t55-tank.glb')
print('HEALTHY_EXPORTED',flush=True)
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "date -u '+%T'; scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/; ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "ssh gex44 'tail -14 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 529ms:
codex
The main build script now includes the shaped hull and turret, hollow gun bore, individual tread links, dished road wheels, hatches, and removable equipment. The first GPU run is starting with shared material bakes; I’m building the matching damage pieces and exported-file proof renders next.

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/bin/bash -lc "ssh gex44 'ps -eo pid,etime,args | rg \"t55|blender.real\" | head -10'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 518ms:
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/bin/bash -lc "cat >> build_t55-tank.py <<'PY'
# Damage twins retain exactly the healthy part origins and the same local frame.
def copy_obj(o,name=None):
 n=o.copy();n.data=o.data.copy() if o.data else None;bpy.context.collection.objects.link(n);n.parent=None;n.matrix_world=o.matrix_world.copy()
 if name:n.name=name
 return n
def parent_world(o,p):
 wm=o.matrix_world.copy();o.parent=p;o.matrix_world=wm
HD=empty('Hull_Damage',(0,0,0));TD=empty('Turret_Damage',T)
damage=[HD,TD];twins={}
for p in parts:
 if any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum','EngineGrille','ExhaustShroud','Turret_IR','Turret_Sight','Turret_Cupola']):
  d=copy_obj(p,p.name.replace('Part_','Dmg_'));vlist=d.data.vertices
  # Bend sheet extremities, crush barrels and wrench mounted fixtures from their seats.
  extent=max((v.co.length for v in vlist),default=1)
  for v in vlist:
   x,y,z=v.co;fall=max(0,(abs(y)/max(.01,extent)-.15))
   if 'Fender' in p.name:v.co.z+=.34*fall*sin(y*2.1);v.co.x+=.13*fall
   elif 'FuelDrum' in p.name:v.co.x+=.085*sin(y*10+z*8);v.co.z-=.075*(1+sin(y*8))
   elif 'Grille' in p.name:v.co.z+=.16*max(0,sin(x*4+y*5))
   else:v.co.z+=.09*sin(y*7+x*4);v.co.x+=.055*sin(z*12+y*5)
  # torn black/steel section carried on twin itself
  for poly in d.data.polygons:
   if random.random()<.14:
    if M['Burnt'].name not in [m.name for m in d.data.materials]:d.data.materials.append(M['Burnt'])
    poly.material_index=len(d.data.materials)-1
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name
# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
def impact(center,normal,r=.082,penetration=False):
 n=Vector(normal).normalized();q=Vector((0,0,1)).rotation_difference(n);v=[];f=[]
 # flat outer soot rim, scraped silver rim, dark inward-facing crater floor
 radii=[r*1.9,r*1.16,r*.83,r*.48,0.001];heights=[.0023,.003,.012 if penetration else .004,.003,.003]
 for j,rr in enumerate(radii):
  for k in range(20):
   a=k*2*pi/20;rr2=rr*(1+.13*sin(k*7.13));h=heights[j]+(.013*(k%2) if penetration and j==2 else 0)
   v.append(tuple(Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),h))))
 for j in range(4):
  for k in range(20):f.append((j*20+k,j*20+(k+1)%20,(j+1)*20+(k+1)%20,(j+1)*20+k))
 o=mesh('impact',v,f,'Scars');o.data.materials.append(M['Burnt'])
 for p in o.data.polygons:p.material_index=1 if p.index//20 in [0,3] else 0
 # ricochet furrow raised only millimetres from plate
 a=Vector(center)+q@Vector((r*.9,.01,.004));b=Vector(center)+q@Vector((r*2.5,.025,.004))
 return [o,tube([a,b],.004,'Scars')]
scar_names=[]
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  if face=='Front':
   x=-.7+i*.43;y=-2.70+.05*sin(i);z=1.20+(y+3.12)*(.28/.88);c=(x,y,z);normal=(0,-.304,.953)
  elif face=='Rear':c=(-.72+i*.46,3.18,.72+.10*sin(i));normal=(0,1,0)
  else:
   s=1 if face=='L' else -1;c=(s*1.372,-1.8+i*1.1,1.20);normal=(s,0,0)
  bits+=impact(c,normal,.065 if i else .09,i==0)
 o=join(bits,'Scar_Hull_'+face);parent_world(o,HD);damage.append(o);scar_names.append(o.name)
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  angle={'Front':-pi/2,'Rear':pi/2,'L':0,'R':pi}[face]+(i-1.5)*.17
  z=1.88+.07*(i%2);rx=1.16 if i%2==0 else 1.13;ry=1.26 if i%2==0 else 1.23
  c=(rx*cos(angle),T[1]+ry*sin(angle)+.075*(z-T[2]),z);normal=(cos(angle),sin(angle),.40)
  bits+=impact(c,normal,.066,i==0)
 o=join(bits,'Scar_Turret_'+face,T);parent_world(o,TD);damage.append(o);scar_names.append(o.name)
broken=[]
for tr in tracks:
 d=copy_obj(tr,tr.name+'_Broken');side=1 if tr.name=='Track_L' else -1
 # Each link is moved rigidly to retain its construction. A loose upper run falls outside the road wheels.
 for v in d.data.vertices:
  co=v.co;p,q=sample(min(range(96),key=lambda j:(Vector((co.y,co.z))-sample(j/96)[0]).length_squared)/96)
  y,z=p
  if z>.93:
   co.x+=side*.56;co.z-=z-.06;co.y-=.5
  elif y<-2.7:
   t=max(0,min(1,(z-.06)/.9));co.x+=side*.56*t;co.y-=1.2*t;co.z-=max(0,z-.07)*.96
 parent_world(d,HD);damage.append(d);broken.append(d)
# Destroyed gun uses the actual mantlet and tube, bent at the trunnion with a ripped muzzle.
bits=[copy_obj(gun),copy_obj(barrel)]
rot=Matrix.Translation(Vector(G))@Matrix.Rotation(math.radians(16),4,'X')@Matrix.Translation(-Vector(G))
for o in bits:o.matrix_world=rot@o.matrix_world
bg=join(bits,'Gun_Broken',G)
for v in bg.data.vertices:
 if v.co.y<-2.15:
  v.co.x+=.12*(v.co.y+2.15)**2;v.co.z-=.08*abs(v.co.y+2.15)
parent_world(bg,TD);damage.append(bg)
# Wreck copies originate from the healthy assemblies. Decimation only affects these static wreck meshes.
whbits=[];wtbits=[]
turret_set={turret,gun,barrel,mg,*[o for o in healthy if o.parent in [turret,gun,barrel]]}
for o in healthy:
 if o.type"'!='"'MESH' or o in tracks:continue
 ist=o in turret_set
 if o.name.startswith('Part_') and (sum(o.name.encode())%5 in [0,1,2]):continue
 if o.name.startswith('Part_EngineGrille'):continue
 c=copy_obj(o)
 if o.name.startswith('Hatch_'):
  pivot=o.matrix_world.translation;c.matrix_world=Matrix.Translation(pivot)@Matrix.Rotation(math.radians(72),4,'X')@Matrix.Translation(-pivot)@c.matrix_world
 if o in [gun,barrel]:c.matrix_world=rot@c.matrix_world
 if o in wheels:
  c.location.z-=.05
  # burnt rubber rim shrinks off, exposing the steel wheel flange
  for p in c.data.polygons:
   if c.data.materials[p.material_index].name=='Rubber':
    for ix in p.vertices:c.data.vertices[ix].co*=.999
 if not ist and not o.name.startswith('Hatch_'):c.location.z-=.015
 c.data.materials.clear();c.data.materials.append(M['Burnt'])
 for p in c.data.polygons:p.material_index=0
 (wtbits if ist else whbits).append(c)
for tr in [broken[0],tracks[1]]:
 c=copy_obj(tr);c.data.materials.clear();c.data.materials.append(M['Burnt']);
 for p in c.data.polygons:p.material_index=0
 whbits.append(c)
# Ruptured engine deck plates and dark exposed compartment.
for s in [-1,1]:
 o=box((s*.45,1.65,1.64),(.88,.95,.045),'Burnt',.018);o.rotation_euler[1]=s*.4;whbits.append(o)
whbits.append(cyl((0,-.28,1.13),.96,.09,'Burnt',verts=64))
wh=join(whbits,'Wreck_Hull')
# Cut ring well right through deck geometry, leaving a bottom and thick rim.
cut=cyl((0,-.28,1.69),.98,.96,'Interior',verts=64);apply(cut)
bpy.context.view_layer.objects.active=wh
mod=wh.modifiers.new('Open turret well','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cut
bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
wtbits += [cyl((0,-.28,1.475),1.05,.085,'Burnt',verts=64),cyl((0,-.28,1.27),.62,.37,'Burnt',verts=48),ring((0,-.28,1.09),.61,.045,'Burnt')]
wt=join(wtbits,'Wreck_Turret',T)
for o in [wh,wt]:
 mod=o.modifiers.new('Wreck LOD','DECIMATE');mod.ratio=.36;apply(o)
damage += [wh,wt]
# Damage only allows these five materials. Convert incidental Metal/Canvas/etc to burnt metal.
allowed={'Paint','Burnt','Scars','TrackSteel','Rubber'}
for o in damage:
 if o.type=='MESH':
  for i,m in enumerate(o.data.materials):
   if m.name not in allowed:o.data.materials[i]=M['Burnt']
jb=export(damage,'t55-tank-damage.glb')
print('DAMAGE_EXPORTED',tri_count(damage),flush=True)
# Measure the serialized scene graph in the target Y-up coordinate frame.
def node_manifest(objects):
 bpy.context.view_layer.update();result=[]
 for o in objects:
  p=o.matrix_world.translation;result.append({'name':o.name,'world_position':[round(p.x,5),round(p.z,5),round(-p.y,5)],'parent':o.parent.name if o.parent else None})
 return result
coords=[o.matrix_world@Vector(v) for o in healthy if o.type=='MESH' for v in o.bound_box]
bb={'min':[min(v.x for v in coords),min(v.z for v in coords),min(-v.y for v in coords)],'max':[max(v.x for v in coords),max(v.z for v in coords),max(-v.y for v in coords)]}
meta={'units':'metres','axes':{'up':'+Y','forward':'+Z','left':'+X'},'contract':'tank-damage/v1','bounds':bb,'nodes':node_manifest(healthy),'damage_nodes':node_manifest(damage),'paints':[{'name':n,'linear_rgb':c} for n,c in PAINTS],'triangles':{'healthy':tri_count(healthy),'damage':tri_count(damage),'wreck':tri_count([wh,wt])},'damage':{'parts':[{'part':p.name,'twin':twins.get(p.name)} for p in parts],'scars':scar_names,'broken':{'Track_L':'Track_L_Broken','Track_R':'Track_R_Broken','Gun':'Gun_Broken'},'wreck':['Wreck_Hull','Wreck_Turret']}}
(ROOT/'nodes.json').write_text(json.dumps(meta,indent=2))
# Verify and render solely re-imported GLBs from an empty scene.
bpy.ops.object.select_all(action='SELECT');bpy.ops.object.delete(use_global=False)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank-damage.glb'));D=[o for o in S.objects if o not in A]
# Blender may suffix the second Paint material; imports faithfully carry the same factor.
def hide_group(objs,hide):
 for o in objs:o.hide_render=hide
hide_group(D,True)
# studio ground, sky and large soft daylight sources
bpy.ops.mesh.primitive_plane_add(size=200,location=(0,0,-.032));ground=bpy.context.object;ground.name='Studio_Ground'
mat=bpy.data.materials.new('Studio');mat.diffuse_color=(.19,.205,.215,1);ground.data.materials.append(mat)
world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.62,.70,.80,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
for name,loc,power,size in [('Daylight',(-4,-6,9),2100,7),('Fill',(5,-1,6),1500,6),('Rim',(0,6,7),2400,5)]:
 data=bpy.data.lights.new(name,'AREA');data.energy=power;data.shape='DISK';data.size=size;o=bpy.data.objects.new(name,data);S.collection.objects.link(o);o.location=loc;o.rotation_euler=(Vector((0,0,1))-o.location).to_track_quat('-Z','Y').to_euler()
camdata=bpy.data.cameras.new('Camera');cam=bpy.data.objects.new('Camera',camdata);S.collection.objects.link(cam);S.camera=cam
cam.location=(9,-12,7);target=Vector((0,-.65,1.1));cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler();camdata.type='ORTHO';camdata.ortho_scale=10.8;camdata.lens=48
S.view_settings.view_transform='AgX';S.render.resolution_percentage=100;S.render.film_transparent=False
S.render.image_settings.color_mode='RGB'
def render(name,w=1920,h=1080,samples=24):
 S.render.resolution_x=w;S.render.resolution_y=h;S.cycles.samples=samples;S.render.filepath=str(ROOT/name);bpy.ops.render.render(write_still=True)
render('final.png')
cam.location=(10,0,3);cam.rotation_euler=(Vector((0,-.85,1.2))-cam.location).to_track_quat('-Z','Y').to_euler()
# exact orthographic side along X
cam.location=(12,-.85,1.3);cam.rotation_euler=(Vector((0,-.85,1.3))-cam.location).to_track_quat('-Z','Y').to_euler();camdata.ortho_scale=10.8
render('side.png',1920,1080)
cam.location=(9,-12,7);cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler()
clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
S.view_layers[0].material_override=clay;render('clay.png');S.view_layers[0].material_override=None
# Exercise every articulated node at 30 degrees, retain a visual evidence render and reset.
moving=[o for o in A if o.name in ['Turret','Gun','Barrel','MG'] or o.name.startswith(('Wheel_','Hatch_'))]
old={o:o.matrix_basis.copy() for o in moving}
for o in moving:
 if o.name=='Barrel':o.location.y+=.13
 else:o.rotation_euler[2 if o.name in ['Turret','MG'] else 0]+=pi/6
render('pivots.png',1280,720,16)
for o,m in old.items():o.matrix_basis=m
# Contact-sheet composition entirely in Blender images (no external renderer).
def sheet(paths,out):
 images=[bpy.data.images.load(str(ROOT/p),check_existing=False) for p in paths];w,h=images[0].size
 import numpy as np
 arr=np.zeros((h*2,w*3,4),dtype=np.float32)
 for i,im in enumerate(images):
  a=np.array(im.pixels[:],dtype=np.float32).reshape(h,w,4);row=1-i//3;col=i%3;arr[row*h:(row+1)*h,col*w:(col+1)*w]=a
 im=bpy.data.images.new(out,width=w*3,height=h*2);im.pixels.foreach_set(arr.ravel());im.filepath_raw=str(ROOT/out);im.file_format='PNG';im.save()
 for im in images:bpy.data.images.remove(im)
# Imported glTF uses a base texture multiply for paint: update the factor socket discovered from links.
pm=[m for m in bpy.data.materials if m.name.startswith('Paint') and m.users]
def set_paint(col):
 for m in pm:
  bs=m.node_tree.nodes.get('Principled BSDF')
  if not bs:continue
  sock=bs.inputs['Base Color']
  if sock.is_linked:
   n=sock.links[0].from_node
   if n.type=='MIX':
    for inp in n.inputs:
     if inp.type=='RGBA' and not inp.is_linked:inp.default_value=(*col,1)
   elif n.type=='MIX_RGB':
    for inp in n.inputs[1:]:
     if not inp.is_linked:inp.default_value=(*col,1)
  else:sock.default_value=(*col,1)
paths=[]
for i,(name,col) in enumerate(PAINTS):
 set_paint(col);p=f'_paint_{i}.png';render(p,640,360,12);paths.append(p)
sheet(paths,'paints.png');set_paint(PAINTS[0][1])
An={o.name:o for o in A};Dn={o.name:o for o in D};statepaths=[]
def reset():hide_group(A,False);hide_group(D,True)
def show(name):
 if name in Dn:Dn[name].hide_render=False
for state in range(6):
 reset()
 if state==1:
  for n in scar_names:show(n)
  chosen=[p for p in parts if p.name in twins][:6]
  for p in chosen:An[p.name].hide_render=True;show(twins[p.name])
 if state==2:
  for o in A:
   if o.name.startswith('Part_'):o.hide_render=True
 if state==3:
  An['Track_L'].hide_render=True;show('Track_L_Broken');An['Gun'].hide_render=True;An['Barrel'].hide_render=True;show('Gun_Broken')
 if state>=4:
  hide_group(A,True);show('Wreck_Hull');show('Wreck_Turret')
 if state==5:
  w=Dn['Wreck_Turret'];wm=w.matrix_world.copy();w.location=(3.25,.4,.90);w.rotation_euler=(.30,2.50,.4)
 p=f'_state_{state}.png';render(p,640,360,16);statepaths.append(p)
 if state==5:w.matrix_world=wm
sheet(statepaths,'states.png')
reset()
# Keep user-facing directory concise: intermediate frame tiles are disposable.
for p in paths+statepaths:(ROOT/p).unlink(missing_ok=True)
(ROOT/'NOTES.md').write_text('\\n'.join([
'T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.',
f\"Triangles: healthy {meta['triangles']['healthy']:,}; damage {meta['triangles']['damage']:,}; wreck {meta['triangles']['wreck']:,}.\",
'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.',
'Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.',
'Poly Haven CC0 IDs: '+', '.join(IDS)+'; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.',
'Reference differences: five road wheels follow the written brief; MG and antenna extend beyond the 2.40 m turret-height envelope; no insignia.'])+'\\n')
print('DONE',json.dumps(meta['triangles']),flush=True)
PY
python3 -m py_compile build_t55-tank.py
ssh gex44 'tail -10 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E \"t55|blender.real\" | head -10'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 695ms:
1254606       08:38 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/renault-ft-tank-v1/build_renault-ft-tank.py -- --rebake
1280089       05:20 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/churchill-tank-v1/preflight.py
1284156       04:45 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1295020       02:49 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1295021       02:49 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1296675       02:35 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1303644       01:25 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1306456       01:02 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/leopard2-tank-v1/build_leopard2-tank.py
1311616       00:00 bash -c tail -10 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E "t55|blender.real" | head -10
1311619       00:00 grep -E t55|blender.real

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/bin/bash -lc "ssh gex44 'kill 1295021'; scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/; ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 143 in 180880ms:
16:16:27
Terminated

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/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep \"t55-tank-v1/build\" | head -5'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 579ms:
1312522       00:20 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1312523       00:20 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1314047       00:00 bash -c tail -8 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep "t55-tank-v1/build" | head -5
1314050       00:00 grep t55-tank-v1/build
16:19:50

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/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py'
s=open(p).read().replace('tracks=[]\\nfor s,side',\"from mathutils.kdtree import KDTree\\ntrack_samples=[sample(j/96) for j in range(96)]\\ntrack_kd=KDTree(96)\\nfor j,(p,q) in enumerate(track_samples):track_kd.insert((p[0],p[1],0),j)\\ntrack_kd.balance()\\ntracks=[]\\nfor s,side\")
s=s.replace(\"idx=min(range(96),key=lambda j:(Vector((co.y,co.z))-sample(j/96)[0]).length_squared)\",\"idx=track_kd.find((co.y,co.z,0))[1]\")
s=s.replace(\"co=v.co;p,q=sample(min(range(96),key=lambda j:(Vector((co.y,co.z))-sample(j/96)[0]).length_squared)/96)\",\"co=v.co;p,q=track_samples[track_kd.find((co.y,co.z,0))[1]]\")
s=s.replace(\"# Cast seam, welded grab rails, lifting eyes.\",\"# Cast seam, welded grab rails, lifting eyes.\")
# true hatch apertures: carve down only to a closed well floor
s=s.replace(\"# visible coaming conceals solid dome beneath, closed hatch over dark modeled cup.\",\"\"\"# True recessed crew hatch aperture with a dark closed well below the hinge.
 base=turret if parent else hull
 cutter=cyl((x,y,z+.08),r*.86,.48,'Interior',verts=48);apply(cutter)
 bpy.context.view_layer.objects.active=base
 mod=base.modifiers.new('Crew hatch opening','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cutter
 bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cutter,do_unlink=True)
 # visible coaming encloses a dark cup with its floor below the armoured deck.\"\"\")
s=s.replace(\"cyl((x,y,z-.08),r*.86,.12,'Interior')\",\"cyl((x,y,z-.16),r*.86,.035,'Interior')\")
open(p,'w').write(s)
PY
ssh gex44 'kill 1312523'; scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/; ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 143 in 47388ms:
Terminated

codex
The shared GPU gate is queueing Blender behind other asset jobs, so I don’t have a render to judge yet. The damage build is now scripted, including matching part origins, dropped track runs, a damaged gun, and separate hull and turret wreck meshes.

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/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log; nvidia-smi --query-gpu=memory.free,utilization.gpu --format=csv,noheader; ps -eo pid,etime,args | grep blender.real | head -12'; ls -lh" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 603ms:
9814 MiB, 25 %
1254606       09:44 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/renault-ft-tank-v1/build_renault-ft-tank.py -- --rebake
1284156       05:50 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1306456       02:07 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/leopard2-tank-v1/build_leopard2-tank.py
1312157       00:57 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/leopard2-tank-v1/build_leopard2-tank.py
1315275       00:18 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1316735       00:07 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1317673       00:00 bash -c tail -8 /root/fal-author/t55-tank-v1/build.log; nvidia-smi --query-gpu=memory.free,utilization.gpu --format=csv,noheader; ps -eo pid,etime,args | grep blender.real | head -12
1317678       00:00 grep blender.real
total 892K
-rw-rw-r-- 1 claude-agent claude-agent  11K Oct 11 16:11 PROMPT.txt
drwxrwxr-x 2 claude-agent claude-agent 4.0K Oct 11 16:19 __pycache__
-rw-rw-r-- 1 claude-agent claude-agent 144K Oct 11 16:20 astra.log
-rw-rw-r-- 1 claude-agent claude-agent  39K Oct 11 16:20 build_t55-tank.py
-rw-rw-r-- 1 claude-agent claude-agent 8.8K Oct 11 15:20 job.json
-rw-rw-r-- 1 claude-agent claude-agent 665K Oct 11 15:22 sheet.jpg
-rw-rw-r-- 1 claude-agent claude-agent   43 Oct 11 15:22 sheet.log
-rw-rw-r-- 1 claude-agent claude-agent  951 Oct 11 15:20 sheet_prompt.txt
-rw-rw-r-- 1 claude-agent claude-agent   21 Oct 11 16:11 started.txt

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/bin/bash -lc "ssh gex44 'tail -20 /root/fal-author/t55-tank-v1/build.log'; python3 - <<'PY'
import ast
s=ast.parse(open('build_t55-tank.py').read());print('Python syntax valid;',len(s.body),'top-level statements')
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 555ms:
Python syntax valid; 244 top-level statements

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/bin/bash -lc "cat > /tmp/t55-verify.py <<'PY'
import json,struct,sys,io
from pathlib import Path
from PIL import Image
for arg in sys.argv[1:]:
 p=Path(arg);b=p.read_bytes();l=struct.unpack_from('<I',b,12)[0];g=json.loads(b[20:20+l]);bin=b[28+l:]
 tri=sum(g['accessors'][x['indices']]['count']//3 for m in g['meshes'] for x in m['primitives'])
 print(p.name,'bytes',len(b),'triangles',tri,'materials',[m.get('name') for m in g['materials']])
 names=[n.get('name') for n in g['nodes']];print('nodes',len(names),'parts',sum(x.startswith('Part_') for x in names),'root',[names[i] for i in g['scenes'][g.get('scene',0)]['nodes']])
 sizes=[]
 for im in g.get('images',[]):
  v=g['bufferViews'][im['bufferView']];off=v.get('byteOffset',0);img=Image.open(io.BytesIO(bin[off:off+v['byteLength']]));sizes.append((im.get('name'),img.size))
 print('images',sizes)
 for m in g['materials']:
  if m.get('name')=='Paint':print('paint',m['pbrMetallicRoughness'].get('baseColorFactor'))
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
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/bin/bash -lc "ssh gex44 'tail -15 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E \"blender.real -b|gpu_gate.py --name blender\" | head -9'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 623ms:
1254606       10:46 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/renault-ft-tank-v1/build_renault-ft-tank.py -- --rebake
1284156       06:52 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1315275       01:20 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1316735       01:09 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1318660       00:50 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1321520       00:11 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/churchill-tank-v1/build_churchill-tank.py
1323048       00:00 bash -c tail -15 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E "blender.real -b|gpu_gate.py --name blender" | head -9
1323051       00:00 grep -E blender.real -b|gpu_gate.py --name blender
16:21:26

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/bin/bash -lc "ssh gex44 'tail -12 /root/fal-author/t55-tank-v1/build.log'; sed -n '1,140p' /home/claude-agent/.agents/skills/blender-game-assets/reference/critic-loop.md" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 581ms:
<!-- Distilled from vercel-labs/vgpu .claude/skills/vgpu-agent-flow/references/asset-iteration.md and
.subharness/agents/asset-author.ts + asset-critic.ts at commit 68cb1d8d198c (MIT, Copyright (c) 2025 Vercel, Inc.),
rewritten for Forge lanes (forge-agent, Astra author, a second model family as critic). -->

# Author and critic loop for a Blender asset

Use this for any authored asset that will be judged by eye: a hero prop, a character, a building, an
environment. Skip it for a mechanical re-export.

## Seats

| Seat | Who | Owns |
| --- | --- | --- |
| Author | Astra (operator law: Blender work goes to Astra) | Geometry, authored materials, UVs, bakes, Blender renders, the export |
| Runtime | The root, or one worker when the shader work is real | Loading the export in the game's actual three.js path, captures, measured costs |
| Critic | A different model family from the author, reading the real images | Findings only. Never edits the asset |

The critic must open the actual capture files. A critic that cannot read images says so and returns
BLOCKED; it never writes a visual verdict from metrics or from the author's description.

## Budget

- Default: **3 revisions, at most 2 critic passes per revision.** The brief may set another cap.
- A cap is an execution limit, not acceptance. Cap reached with open visual findings = `REVISE`
  reported as such, never a `PASS`.
- No unattended improvement loop past the cap.

## Before the first render

Write in the task folder: scope, target cameras (gameplay view, hero, rear, closest required view),
output paths, budgets (triangles, exported vertices, texture bytes and GPU memory, draw calls) and
the revision cap. Budgets are task inputs; do not copy another asset's numbers.

Run the [preflight](preflight-and-recovery.md) once: Blender starts and runs a scene operation, a
tiny bake and export round-trips through the real loader, one real runtime frame is captured.

Integrate a cheap LOW blockout in the runtime at this stage. Scale, axis, camera and material
contract problems are found before an expensive bake, not after.

## Each revision keeps

- the source revision or parameters that rebuild the previous asset;
- real hero, rear and close-up captures, same camera, light, exposure and pose every time;
- triangles, exported vertices, primitives, material count, file bytes, texture GPU memory;
- runtime draw counters, kept apart from offline estimates;
- the critic's findings, the fixes chosen, and the next measured result.

## The critic pass

The critic receives the previous AND the current captures and metrics under matched cameras (or
an explicit "first revision, no baseline"), the reference image, and the brief. It returns:

- **at most five findings**, ordered by impact, each with a stable id, the evidence path (whole
  view plus crop or image coordinates), the visible symptom, a suggested correction and a
  **measurable acceptance condition**;
- regressions against the previous revision;
- resolved / remaining / regressed status of earlier findings on a follow-up pass;
- `PASS`, `REVISE` or `BLOCKED`, with the limits of its evidence.

It compares against the reference as well as the previous revision: clean topology and progress
since last time do not make the asset match the reference. It separates the observed defect from
the suspected cause. A small whole-image difference can hide severe local damage (thin trim,
stairs, silhouette edges): it inspects crops at each delivered LOD. Design ideas are suggestions,
not new acceptance requirements.

When the cause could be the asset or the renderer, it asks for the diagnostic captures in
[runtime parity](runtime-parity-and-diagnostics.md) (maps off, AO neutral, lightmap off) rather
than guessing.

## Rules that stop false passes

- A generated concept image is never proof of a working model. Label concepts as concepts; accept
  only on real renders of the real export.
- Requested bakes need bake provenance (what was baked, from what, at what settings) and matched
  runtime captures with each contribution switched off in turn. Vertex tint and runtime shadows
  are not substitutes for a requested AO or lightmap bake.
- An atlas repair is checked on the full matched views, not only on the crop that was broken: a new
  layout can fix one edge and turn another face black.
- One writer per handoff file. A reply never gets appended to a request file another agent will
  regenerate. Superseded manifests and failed captures stay on disk.
- The author hands the root a compact result: verdict, the few decisive images, the metrics table.
  Full capture sets stay on disk; the root does not load every image.
- A user's rejection or a changed brief reopens any earlier `PASS`.

## Lessons

When a revision teaches something that will recur, write it as: evidence path, symptom, cause,
intervention, matched before/after result, scope. The root checks it and makes a narrow edit to this
skill. Reject task-specific style preferences dressed up as general rules.

codex
The rig and damage exports will be checked after re-import into a fresh Blender scene. That will expose export problems with pivots, hierarchy, paint factors, and state visibility before I judge the final renders.

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/bin/bash -lc "ssh gex44 'tail -20 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep \"blender.real -b\" | head -8'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 515ms:
1254606       11:24 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/renault-ft-tank-v1/build_renault-ft-tank.py -- --rebake
1315275       01:59 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1316735       01:48 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1321520       00:50 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/churchill-tank-v1/build_churchill-tank.py
1325482       00:16 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/renault-ft-tank-v1/build_renault-ft-tank.py -- --rebake
1326860       00:02 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1327266       00:00 bash -c tail -20 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep "blender.real -b" | head -8
1327269       00:00 grep blender.real -b

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/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read()
s=s.replace(\"import bpy, math, os, json, random, urllib.request, struct, sys\",\"import bpy, bmesh, math, os, json, random, urllib.request, struct, sys\")
s=s.replace(\"noise=node(m,'ShaderNodeTexNoise');\", \"arm=image_node(m,download(id,'arm'),True);arm_sep=node(m,'ShaderNodeSeparateColor');link(m,arm,'Color',arm_sep,'Color')\\n noise=node(m,'ShaderNodeTexNoise');\",1)
s=s.replace(\"comb.inputs[2].default_value=metal;link(m,comb,'Color',em,'Color')\", \"comb.inputs[2].default_value=metal\\n    rr=node(m,'ShaderNodeMapRange');rr.inputs['From Min'].default_value=0;rr.inputs['From Max'].default_value=1;rr.inputs['To Min'].default_value=max(.1,rough-.18);rr.inputs['To Max'].default_value=min(1,rough+.08);link(m,arm_sep,'Green',rr,'Value');link(m,rr,'Result',comb,1)\\n    aa=node(m,'ShaderNodeMapRange');aa.inputs['To Min'].default_value=.72;aa.inputs['To Max'].default_value=1;link(m,arm_sep,'Red',aa,'Value');link(m,aa,'Result',comb,0);link(m,comb,'Color',em,'Color')\")
s=s.replace(\"z=.80;bits=[cyl\", \"z=.73;bits=[cyl\")
s=s.replace(\"# burnt rubber rim shrinks off, exposing the steel wheel flange\\n  for p in c.data.polygons:\\n   if c.data.materials[p.material_index].name=='Rubber':\\n    for ix in p.vertices:c.data.vertices[ix].co*=.999\", \"# Remove tyre geometry entirely: burnt wheel exposes the bare metal flange.\\n  bm=bmesh.new();bm.from_mesh(c.data);dead=[f for f in bm.faces if c.data.materials[f.material_index].name=='Rubber'];bmesh.ops.delete(bm,geom=dead,context='FACES');bm.to_mesh(c.data);bm.free()\")
# Fix ground contact to precisely zero by lowering only the modeled tread belts by their minimum.
s=s.replace(\"tracks.append(tr)\",\"low=min(v.co.z for v in tr.data.vertices)\\n for v in tr.data.vertices:v.co.z-=low\\n tracks.append(tr)\")
open(p,'w').write(s)
PY
python3 -m py_compile build_t55-tank.py
ssh gex44 'tail -15 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 706ms:
codex
I’ve added true hatch recesses and tightened two details before the render check: the tread belts sit exactly on the ground plane, and the wreck loses its tyre geometry to expose the steel wheels. The shared baked materials also carry surface roughness variation from the Poly Haven maps.

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/bin/bash -lc "scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -12 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep "blender.real -b" | head -8'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1438ms:
1315275       03:33 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1316735       03:22 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1321520       02:24 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/churchill-tank-v1/build_churchill-tank.py
1326860       01:36 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1331964       00:41 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/type99-tank-v1/build_type99-tank.py -- --preflight
1334808       00:08 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/churchill-tank-v1/build_churchill-tank.py
1335906       00:00 bash -c test ! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -12 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep "blender.real -b" | head -8
1335910       00:00 grep blender.real -b

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace(\"uv.data[li].uv=((co.x-s*1.34)/.59+.5,idx/96)\",\"sp,sq=track_samples[idx]\\n   vv=idx/96+(Vector((co.y,co.z))-sp).dot(sq)/lens[-1]\\n   uv.data[li].uv=((co.x-s*1.34)/.59+.5,vv)\")
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -8 /root/fal-author/t55-tank-v1/build.log'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1463ms:
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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace('def bevel(o,w=.012,seg=2):','def bevel(o,w=.012,seg=1):').replace('if bev:bevel(o,bev)','if bev:bevel(o,bev,3 if bev>=.05 else 1)').replace('bevel(o,.005,2);matobj(o,mat)','bevel(o,.005,1);matobj(o,mat)')
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -8 /root/fal-author/t55-tank-v1/build.log'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1470ms:
codex
The texture plan is within the requested size limits: a 1024 px neutral Paint texture and shared 512 px maps for the other surfaces. Once the queued build runs, I’ll measure the exported triangle counts and file sizes, then check the silhouette and surface finish visually.

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exec
/bin/bash -lc "ssh gex44 'tail -12 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep \"blender.real -b\" | head -8'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 537ms:
1315275       05:00 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1316735       04:48 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1326860       03:03 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/panther-tank-v1/build_panther-tank.py
1331964       02:08 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/type99-tank-v1/build_type99-tank.py -- --preflight
1336268       01:19 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t34-85-tank-v1/build_t34-85-tank.py
1338794       00:55 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/char-b1-tank-v1/preflight.py
1342780       00:00 bash -c tail -12 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep "blender.real -b" | head -8
1342783       00:00 grep blender.real -b
16:25:05

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/bin/bash -lc "ssh gex44 \"for id in green_metal_rust rusty_metal rubberized_track bark_brown_02; do printf '%s ' \\\"\\"'$id'"\\\"; curl -A 'Mozilla/5.0' -L -s -o /dev/null -w '%{http_code}\\\\n' \\\"https://dl.polyhaven.org/file/ph-assets/Textures/jpg/1k/\\"'$id/'"\\"'${id}_arm_1k.jpg'"\\\"; done\"" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1001ms:
green_metal_rust 200
rusty_metal 200
rubberized_track 200
bark_brown_02 200

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mcp: forge/coord_note started
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exec
/bin/bash -lc "ssh gex44 'tail -10 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 495ms:
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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read();a=s.index('# Rear fuel drums');b=s.index(\"part('UnditchingBeam'\",a)
s=s[:a]+'''# Rear fuel drums lie transversely, matching the circular end visible in the side reference.
for i,x in enumerate([-.66,.66]):
 bits=[cyl((x,2.77,1.66),.29,.80,'Paint','X',48)]
 for off in [-.40,-.34,-.14,.14,.34,.40]:bits.append(ring((x+off,2.77,1.66),.29,.012,'Metal' if abs(off)==.14 else 'Paint','X'))
 for off in [-.408,.408]:bits.append(cyl((x+off,2.77,1.66),.263,.015,'Paint','X',48))
 bits += [cyl((x,2.73,1.956),.025,.022,'Metal','Z',12)]
 part('FuelDrum_'+str(i+1),bits)
 hull=join([hull,box((x,2.7,1.385),(.65,.45,.10)),tube([(x-.24,2.46,1.43),(x-.30,2.46,1.66)],.018)],'Hull')
''' +s[b:]
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -8 /root/fal-author/t55-tank-v1/build.log'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1605ms:
codex
I corrected the rear fuel drums to run across the tank, matching the circular drum end visible in the reference’s side view. The rectangular right-fender fuel cells remain separate removable parts.

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exec
/bin/bash -lc "ssh gex44 'ps -eo pid,etime,args | grep t55-tank-v1 | head -8; tail -10 /root/fal-author/t55-tank-v1/build.log'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 609ms:
1316734       06:11 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1316735       06:11 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1350925       00:00 bash -c ps -eo pid,etime,args | grep t55-tank-v1 | head -8; tail -10 /root/fal-author/t55-tank-v1/build.log
1350927       00:00 grep t55-tank-v1
16:26:28

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read()
s=s.replace(\"def impact(center,normal,r=.082,penetration=False):\", \"def impact(center,normal,r=.082,penetration=False,project=None):\")
s=s.replace(\"v.append(tuple(Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),h))))\", \"point=Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),0))\\n   if project:\\n    point,pn=project(point);point+=pn*h\\n   else:point+=n*h\\n   v.append(tuple(point))\")
s=s.replace(\"elif face=='Rear':c=(-.72+i*.46,3.18,.72+.10*sin(i));normal=(0,1,0)\",\"elif face=='Rear':\\n   zz=.72+.10*sin(i);c=(-.72+i*.46,3.1+(zz-.43)/.72*.125,zz);normal=(0,1,-.174)\")
s=s.replace(\"c=(s*1.372,-1.8+i*1.1,1.20);normal=(s,0,0)\",\"c=(s*(1.04+(1.20-.43)/1.05*.33),-1.8+i*1.1,1.20);normal=(s,0,-.314)\")
s=s.replace(\"for face in ['Front','L','R','Rear']:\\n bits=[]\\n for i in range(4):\\n  angle=\", \"\"\"def turret_surface(point):
 z=point.z-T[2]
 for j in range(len(levels)-1):
  a,rx,ry=levels[j];b,rx2,ry2=levels[j+1]
  if a<=z<=b:
   t=(z-a)/(b-a);rx=rx+(rx2-rx)*t;ry=ry+(ry2-ry)*t
   ang=math.atan2((point.y-T[1]-.075*z)/ry,point.x/rx)
   p=Vector((rx*cos(ang),T[1]+ry*sin(ang)+.075*z,point.z));n=Vector((cos(ang),sin(ang),.4)).normalized();return p,n
 return point,Vector((1,0,0))
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  angle=\"\"\")
s=s.replace(\"bits+=impact(c,normal,.066,i==0)\",\"bits+=impact(c,normal,.066,i==0,turret_surface)\")
open(p,'w').write(s)
PY
python3 -m py_compile build_t55-tank.py
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -8 /root/fal-author/t55-tank-v1/build.log'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1517ms:
codex
The GPU job is still queued. I’m using the wait to check dimensions and surface placement; the impact pieces now follow the sloped hull and curved turret surfaces instead of sitting on flat planes.

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace(\"x=s*1.34\\n\", \"x=s*1.321\\n\").replace(\"co.x-s*1.34\", \"co.x-s*1.321\")
s=s.replace('s*1.63,ya','s*1.617,ya').replace('s*1.63,yb','s*1.617,yb').replace('s*1.64,yy','s*1.615,yy').replace('s*1.657,yy','s*1.617,yy')
s=s.replace(\"cyl((0,3.14,1.08)\",\"cyl((0,3.115,1.08)\").replace(\"(-.93,3.16,1.08)\",\"(-.93,3.09,1.08)\").replace(\"(.93,3.16,1.08)\",\"(.93,3.09,1.08)\")
s=s.replace(\"box((1.41,2.45,1.48),(.46\", \"box((1.41,2.45,1.48),(.44\").replace(\"box((1.665,2.45,1.47),(.026\", \"box((1.625,2.45,1.47),(.020\").replace(\"(1.67,2.14,1.63)\",\"(1.62,2.14,1.63)\").replace(\"(1.67,2.75,1.63)\",\"(1.62,2.75,1.63)\")
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -10 /root/fal-author/t55-tank-v1/build.log'"'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1473ms:
Info: Baking map saved to internal image, save it externally or pack it
BAKED TrackSteel
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Metal
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Canvas
16:29:07

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/bin/bash -lc "ssh gex44 'tail -14 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 484ms:
Info: Baking map saved to internal image, save it externally or pack it
BAKED Lamps
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Interior
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Burnt
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Scars

codex
The GPU run has started, and all ten shared material sets have baked successfully. Blender is now assembling and exporting the geometry; the first render will show whether the proportions and finish need another pass.

 exited 1 in 573778ms:
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exec
/bin/bash -lc "ssh gex44 'tail -10 /root/fal-author/t55-tank-v1/build.log; ls -lh /root/fal-author/t55-tank-v1/*.glb 2>/dev/null'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 2 in 528ms:
BAKED Scars
Traceback (most recent call last):
  File "/root/fal-author/t55-tank-v1/build_t55-tank.py", line 330, in <module>
    for c,wm in mats:c.parent=turret;c.matrix_world=wm
                     ^^^^^^^^
ReferenceError: StructRNA of type Object has been removed

Error: script failed, file: '/root/fal-author/t55-tank-v1/build_t55-tank.py', exiting.

Blender quit

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace('mats=[(c,c.matrix_world.copy()) for c in children]','mats=[(c,c.matrix_world.copy()) for c in children if c "'!= well]'"');open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/; ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
codex
The first geometry run caught a parenting error while merging a hatch recess into the turret. I’ve fixed it and restarted the build. The baked textures are intact; the next run will also include the dimensional corrections.

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace(\"export_image_format='AUTO',export_cameras\", \"export_image_format='JPEG',export_jpeg_quality=90,export_cameras\")
s=s.replace(\"parent_world(d,HD);damage.append(d);broken.append(d)\", \"mod=d.modifiers.new('Broken tread game mesh','DECIMATE');mod.ratio=.65;apply(d)\\n parent_world(d,HD);damage.append(d);broken.append(d)\")
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -5 /root/fal-author/t55-tank-v1/build.log'"'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1692ms:
INFO gpu_gate: gpu slot acquired by blender (pid 1371077, 6000 MiB, batch)
16:31:27

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/bin/bash -lc "ssh gex44 'tail -10 /root/fal-author/t55-tank-v1/build.log; ls -lh /root/fal-author/t55-tank-v1/*.glb 2>/dev/null'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 2 in 515ms:
Info: Baking map saved to internal image, save it externally or pack it
BAKED Interior
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Burnt
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Scars

codex
The restarted build has passed the material stage. I’m keeping the live geometry unchanged until this export finishes, so the render review can be tied to a single build.

 exited 1 in 171765ms:
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exec
/bin/bash -lc "ssh gex44 'tail -12 /root/fal-author/t55-tank-v1/build.log; ls -lh /root/fal-author/t55-tank-v1/*.glb 2>/dev/null'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 502ms:
    return self.unit_import(self.filepath, import_settings)
           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2120, in unit_import
    BlenderGlTF.create(gltf_importer)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/blender_gltf.py", line 41, in create
    BlenderGlTF._create(gltf)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_glt... truncated
Error: script failed, file: '/root/fal-author/t55-tank-v1/build_t55-tank.py', exiting.

Blender quit
-rw-r--r-- 1 root root 13M Oct 11 18:32 /root/fal-author/t55-tank-v1/t55-tank-damage.glb
-rw-r--r-- 1 root root 16M Oct 11 18:32 /root/fal-author/t55-tank-v1/t55-tank.glb
16:33:33

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exec
/bin/bash -lc "ssh gex44 \"grep -A 40 -B 8 'Traceback' /root/fal-author/t55-tank-v1/build.log | head -100; grep -E 'HEALTHY|DAMAGE' /root/fal-author/t55-tank-v1/build.log\"; scp -q gex44:/root/fal-author/t55-tank-v1/{t55-tank.glb,t55-tank-damage.glb,nodes.json} .; python3 /tmp/t55-verify.py t55-tank.glb t55-tank-damage.glb" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 4435ms:
18:32:56 | INFO: Primitives created: 1
18:32:56 | INFO: Extracting primitive: cast turret.001
18:32:56 | INFO: Primitives created: 1
18:32:56 | INFO: Finished glTF 2.0 export in 0.40139317512512207 s

DAMAGE_EXPORTED 125901
18:32:56 | INFO: Data are loaded, start creating Blender stuff
18:32:56 | INFO: Blender create Mesh node Cylinder.436
Traceback (most recent call last):
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2073, in execute
    return self.import_gltf2(context)
           ~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2105, in import_gltf2
    return self.unit_import(self.filepath, import_settings)
           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2120, in unit_import
    BlenderGlTF.create(gltf_importer)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/blender_gltf.py", line 41, in create
    BlenderGlTF._create(gltf)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/blender_gltf.py", line 48, in _create
    BlenderScene.create(gltf)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/scene.py", line 39, in create
    BlenderNode.create_vnode(gltf, 'root')
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 47, in create_vnode
    BlenderNode.create_vnode(gltf, child)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 33, in create_vnode
    obj = BlenderNode.create_object(gltf, vnode_id)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 54, in create_object
    obj = BlenderNode.create_mesh_object(gltf, vnode)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 314, in create_mesh_object
    mesh = BlenderMesh.create(gltf, pynode.mesh, pynode.skin)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 26, in create
    return create_mesh(gltf, mesh_idx, skin_idx)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 52, in create_mesh
    do_primitives(gltf, mesh_idx, skin_idx, mesh, tmp_ob)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 540, in do_primitives
    BlenderMaterial.create(gltf, prim.material, vertex_color)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/material.py", line 68, in create
    pbr_metallic_roughness(mh)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/pbrMetallicRoughness.py", line 162, in pbr_metallic_roughness
    iridescence_factor_socket=mh.settings_node.inputs['Iridescence Factor'] if mh.settings_node else None,
                              ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'bpy_prop_collection[key]: key "Iridescence Factor" not found'
01:29.615  bpy.rna          | ERROR Python script error in IMPORT_SCENE_OT_gltf.execute
Traceback (most recent call last):
  File "/root/fal-author/t55-tank-v1/build_t55-tank.py", line 527, in <module>
    bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Error: Python: Traceback (most recent call last):
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2073, in execute
    return self.import_gltf2(context)
           ~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2105, in import_gltf2
    return self.unit_import(self.filepath, import_settings)
           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/__init__.py", line 2120, in unit_import
    BlenderGlTF.create(gltf_importer)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/blender_gltf.py", line 41, in create
    BlenderGlTF._create(gltf)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/blender_gltf.py", line 48, in _create
    BlenderScene.create(gltf)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/scene.py", line 39, in create
    BlenderNode.create_vnode(gltf, 'root')
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 47, in create_vnode
    BlenderNode.create_vnode(gltf, child)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 33, in create_vnode
    obj = BlenderNode.create_object(gltf, vnode_id)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 54, in create_object
    obj = BlenderNode.create_mesh_object(gltf, vnode)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/node.py", line 314, in create_mesh_object
    mesh = BlenderMesh.create(gltf, pynode.mesh, pynode.skin)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 26, in create
    return create_mesh(gltf, mesh_idx, skin_idx)
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 52, in create_mesh
    do_primitives(gltf, mesh_idx, skin_idx, mesh, tmp_ob)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/mesh.py", line 540, in do_primitives
    BlenderMaterial.create(gltf, prim.material, vertex_color)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/material.py", line 68, in create
    pbr_metallic_roughness(mh)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^
  File "/root/blender-spike/blender-5.2.0-linux-x64/5.2/scripts/addons_core/io_scene_gltf2/blender/imp/pbrMetallicRoughness.py", line 162, in pbr_metallic_roughness
    iridescence_factor_socket=mh.settings_node.inputs['Iridescence Factor'] if mh.settings_node else None,
                              ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'bpy_prop_collection[key]: key "Iridescence Factor" not found'
Location: /root/fal-author/t55-tank-v1/build_t55-tank.py:527
HEALTHY_TRIANGLES 164892
HEALTHY_EXPORTED
DAMAGE_EXPORTED 125901
t55-tank.glb bytes 16085064 triangles 164892 materials ['Paint', 'Metal', 'Paint', 'Metal', 'Lamps', 'Interior', 'Interior', 'TrackSteel', 'Wood', 'Canvas', 'Rubber', 'Lamps']
nodes 60 parts 27 root ['Exhaust', 'Fx_Ammo', 'Fx_Engine', 'Hatch_Driver', 'Hull', 'Light_Head_L', 'Light_Head_R', 'Part_EngineGrille_L', 'Part_EngineGrille_R', 'Part_ExhaustShroud', 'Part_Fender_FL', 'Part_Fender_FR', 'Part_Fender_RL', 'Part_Fender_RR', 'Part_FuelCell_R4', 'Part_FuelCell_R21', 'Part_FuelCell_R38', 'Part_FuelDrum_1', 'Part_FuelDrum_2', 'Part_LampGuard_L', 'Part_LampGuard_R', 'Part_Snorkel', 'Part_SpareLinks', 'Part_Stowage_L4', 'Part_Stowage_L21', 'Part_Stowage_L38', 'Part_Tools', 'Part_TowCable', 'Part_UnditchingBeam', 'Seat_Driver', 'Track_L', 'Track_R', 'Turret', 'Wheel_L1', 'Wheel_L2', 'Wheel_L3', 'Wheel_L4', 'Wheel_L5', 'Wheel_L6', 'Wheel_L7', 'Wheel_R1', 'Wheel_R2', 'Wheel_R3', 'Wheel_R4', 'Wheel_R5', 'Wheel_R6', 'Wheel_R7']
images [('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Metal_Normal', (512, 512)), ('Metal_ORM', (512, 512)), ('Metal_Base', (512, 512)), ('Lamps_Normal', (512, 512)), ('Lamps_ORM', (512, 512)), ('Lamps_Base', (512, 512)), ('Interior_Normal', (512, 512)), ('Interior_ORM', (512, 512)), ('Interior_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512)), ('Wood_Normal', (512, 512)), ('Wood_ORM', (512, 512)), ('Wood_Base', (512, 512)), ('Canvas_Normal', (512, 512)), ('Canvas_ORM', (512, 512)), ('Canvas_Base', (512, 512)), ('Rubber_Normal', (512, 512)), ('Rubber_ORM', (512, 512)), ('Rubber_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]
paint [0.11, 0.14, 0.08, 1]
t55-tank-damage.glb bytes 12656348 triangles 125901 materials ['Burnt', 'Paint', 'Scars', 'Burnt', 'TrackSteel']
nodes 34 parts 0 root ['Hull_Damage', 'Turret_Damage', 'Wreck_Hull', 'Wreck_Turret']
images [('Burnt_Normal', (512, 512)), ('Burnt_ORM', (512, 512)), ('Burnt_Base', (512, 512)), ('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]

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exec
/bin/bash -lc "python3 - <<'PY'
import struct,json,collections
b=open('t55-tank.glb','rb').read();l=struct.unpack_from('<I',b,12)[0];g=json.loads(b[20:20+l]);tot=collections.Counter()
for n in g['nodes']:
 if 'mesh' not in n:continue
 c=sum(g['accessors'][p['indices']]['count']//3 for p in g['meshes'][n['mesh']]['primitives']);tot[n['name'].split('_')[0]]+=c
 if not n['name'].startswith(('Part_','Wheel_')):print(n['name'],c)
print(tot)
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
Hatch_Driver 668
Hull 9660
Track_L 25728
Track_R 25728
Barrel 2016
Gun 1016
Hatch_Commander 668
Hatch_Loader 668
MG 6040
Turret 6496
Counter({'Wheel': 65424, 'Track': 51456, 'Part': 20780, 'Hull': 9660, 'Turret': 6496, 'MG': 6040, 'Barrel': 2016, 'Hatch': 2004, 'Gun': 1016})

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exec
/bin/bash -lc "python3 - <<'PY'
import json,struct
b=open('t55-tank.glb','rb').read();n=struct.unpack_from('<I',b,12)[0];g=json.loads(b[20:20+n]);
for m in g['materials'][:6]:print(json.dumps(m))
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
{"doubleSided": true, "name": "Paint", "normalTexture": {"index": 0}, "occlusionTexture": {"index": 1}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 2}, "metallicRoughnessTexture": {"index": 1}, "baseColorFactor": [0.11, 0.14, 0.08, 1]}}
{"doubleSided": true, "name": "Metal", "normalTexture": {"index": 3}, "occlusionTexture": {"index": 4}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 5}, "metallicRoughnessTexture": {"index": 4}}}
{"doubleSided": true, "name": "Paint", "normalTexture": {"index": 0, "texCoord": 1}, "occlusionTexture": {"index": 1, "texCoord": 1}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 2, "texCoord": 1}, "metallicRoughnessTexture": {"index": 1, "texCoord": 1}, "baseColorFactor": [0.11, 0.14, 0.08, 1]}}
{"doubleSided": true, "name": "Metal", "normalTexture": {"index": 3, "texCoord": 1}, "occlusionTexture": {"index": 4, "texCoord": 1}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 5, "texCoord": 1}, "metallicRoughnessTexture": {"index": 4, "texCoord": 1}}}
{"doubleSided": true, "name": "Lamps", "normalTexture": {"index": 6, "texCoord": 1}, "occlusionTexture": {"index": 7, "texCoord": 1}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 8, "texCoord": 1}, "metallicRoughnessTexture": {"index": 7, "texCoord": 1}}}
{"doubleSided": true, "name": "Interior", "normalTexture": {"index": 9, "texCoord": 1}, "occlusionTexture": {"index": 10, "texCoord": 1}, "pbrMetallicRoughness": {"baseColorTexture": {"index": 11, "texCoord": 1}, "metallicRoughnessTexture": {"index": 10, "texCoord": 1}}}

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exec
/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read();s=s.replace(\"uv=o.data.uv_layers.active or o.data.uv_layers.new(name='UVMap')\", \"for old_uv in list(o.data.uv_layers):o.data.uv_layers.remove(old_uv)\\n uv=o.data.uv_layers.new(name='UVMap');uv.active_render=True\")
s=s.replace(\"healthy=list(bpy.context.scene.objects)\",\"\"\"# Spend geometry on silhouettes; simplify hidden bevel transitions on wheel/tread assemblies.
for o in wheels+tracks:
 bpy.context.view_layer.objects.active=o
 mod=o.modifiers.new('Game geometry budget','DECIMATE');mod.ratio=.72 if o in wheels else .80
 bpy.ops.object.modifier_apply(modifier=mod.name)
healthy=list(bpy.context.scene.objects)\"\"\")
s=s.replace(\"bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)\",\"\"\"for material in list(bpy.data.materials):bpy.data.materials.remove(material)
for ng in list(bpy.data.node_groups):
 if ng.name.startswith('glTF Material Output'):bpy.data.node_groups.remove(ng)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)\"\"\")
open(p,'w').write(s)
PY
python3 -m py_compile build_t55-tank.py
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/; ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
codex
Both GLBs have exported, and the checks caught two issues: excess geometry and file weight, plus a Blender 5.2 material-group conflict during re-import. I’ve adjusted the mesh and texture export settings and fixed the import setup. The candidate healthy file is on disk, but it is not yet the validated delivery.

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/bin/bash -lc "command -v geminix; command -v forge-agent; ssh gex44 'tail -6 /root/fal-author/t55-tank-v1/build.log'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 619ms:
/home/claude-agent/bin/geminix
/home/claude-agent/bin/forge-agent
16:35:04

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/bin/bash -lc "python3 - <<'PY'
p='build_t55-tank.py';s=open(p).read().replace(\"bpy.context.view_layer.update();cen=sum((o.matrix_world.translation for o in objs),Vector())/len(objs)\",\"bpy.context.view_layer.update();corners=[o.matrix_world@Vector(v) for o in objs for v in o.bound_box]\\n cen=Vector(tuple((min(v[i] for v in corners)+max(v[i] for v in corners))*.5 for i in range(3)))\")
open(p,'w').write(s)
PY
scp -q build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build.next.py; ssh gex44 'test "'! -s /root/fal-author/t55-tank-v1/build.log && mv /root/fal-author/t55-tank-v1/build.next.py /root/fal-author/t55-tank-v1/build_t55-tank.py; tail -5 /root/fal-author/t55-tank-v1/build.log'"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1767ms:
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/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 585ms:
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Burnt
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Scars
16:36:58

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/bin/bash -lc "sed -n '1,100p' /home/claude-agent/bin/geminix" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
#!/bin/sh
# geminix — one-shot / scriptable:  geminix "prompt"   |   geminix < file.md
# With no prompt and a terminal on stdin there is nothing to answer, so start
# the interactive session instead of failing.
if [ $# -eq 0 ] && [ -t 0 ]; then
  echo "geminix: no prompt given, starting the interactive session" >&2
  exec "$HOME/bin/forge-gemini"
fi
exec "$HOME/bin/forge-gemini" -p "$@"

codex
The revised build is running. It now uses one UV set per mesh to avoid duplicate exported materials, with geometry reductions focused on the wheel and tread assemblies. The hull and turret silhouettes remain unchanged.

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exec
/bin/bash -lc "ssh gex44 'tail -15 /root/fal-author/t55-tank-v1/build.log; ls -lh /root/fal-author/t55-tank-v1/final.png 2>/dev/null'; date -u '+%T'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 499ms:
18:37:40 | INFO: Blender create Mesh node impact.024
18:37:40 | INFO: Blender create Mesh node impact.028
18:37:40 | INFO: Blender create Mesh node armoured monocoque.001
18:37:40 | INFO: Blender create Mesh node cast turret.001
18:37:40 | INFO: glTF import finished in 0.29s
/root/fal-author/t55-tank-v1/build_t55-tank.py:547: DeprecationWarning: 'World.use_nodes' is expected to be removed in Blender 6.0
  world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.62,.70,.80,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
01:15.961  render           | Saved: '/root/fal-author/t55-tank-v1/final.png'
01:23.103  render           | Saved: '/root/fal-author/t55-tank-v1/side.png'
/root/fal-author/t55-tank-v1/build_t55-tank.py:562: DeprecationWarning: 'Material.use_nodes' is expected to be removed in Blender 6.0
  clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
01:30.789  render           | Saved: '/root/fal-author/t55-tank-v1/clay.png'
01:34.406  render           | Saved: '/root/fal-author/t55-tank-v1/pivots.png'
01:35.705  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_0.png'
01:37.121  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_1.png'
-rw-r--r-- 1 root root 2.0M Oct 11 18:37 /root/fal-author/t55-tank-v1/final.png
16:38:09

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/bin/bash -lc 'scp -q gex44:/root/fal-author/t55-tank-v1/{final.png,side.png,clay.png,pivots.png,t55-tank.glb,t55-tank-damage.glb,nodes.json} .; python3 /tmp/t55-verify.py t55-tank.glb t55-tank-damage.glb' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 1 in 224478ms:
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 succeeded in 11290ms:
t55-tank.glb bytes 8462560 triangles 136260 materials ['Paint', 'Metal', 'Lamps', 'Interior', 'TrackSteel', 'Wood', 'Canvas', 'Rubber']
nodes 60 parts 27 root ['Exhaust', 'Fx_Ammo', 'Fx_Engine', 'Hatch_Driver', 'Hull', 'Light_Head_L', 'Light_Head_R', 'Part_EngineGrille_L', 'Part_EngineGrille_R', 'Part_ExhaustShroud', 'Part_Fender_FL', 'Part_Fender_FR', 'Part_Fender_RL', 'Part_Fender_RR', 'Part_FuelCell_R4', 'Part_FuelCell_R21', 'Part_FuelCell_R38', 'Part_FuelDrum_1', 'Part_FuelDrum_2', 'Part_LampGuard_L', 'Part_LampGuard_R', 'Part_Snorkel', 'Part_SpareLinks', 'Part_Stowage_L4', 'Part_Stowage_L21', 'Part_Stowage_L38', 'Part_Tools', 'Part_TowCable', 'Part_UnditchingBeam', 'Seat_Driver', 'Track_L', 'Track_R', 'Turret', 'Wheel_L1', 'Wheel_L2', 'Wheel_L3', 'Wheel_L4', 'Wheel_L5', 'Wheel_L6', 'Wheel_L7', 'Wheel_R1', 'Wheel_R2', 'Wheel_R3', 'Wheel_R4', 'Wheel_R5', 'Wheel_R6', 'Wheel_R7']
images [('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Metal_Normal', (512, 512)), ('Metal_ORM', (512, 512)), ('Metal_Base', (512, 512)), ('Lamps_Normal', (512, 512)), ('Lamps_ORM', (512, 512)), ('Lamps_Base', (512, 512)), ('Interior_Normal', (512, 512)), ('Interior_ORM', (512, 512)), ('Interior_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512)), ('Wood_Normal', (512, 512)), ('Wood_ORM', (512, 512)), ('Wood_Base', (512, 512)), ('Canvas_Normal', (512, 512)), ('Canvas_ORM', (512, 512)), ('Canvas_Base', (512, 512)), ('Rubber_Normal', (512, 512)), ('Rubber_ORM', (512, 512)), ('Rubber_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]
t55-tank-damage.glb bytes 5781316 triangles 89105 materials ['Burnt', 'Paint', 'Scars', 'TrackSteel']
nodes 34 parts 0 root ['Hull_Damage', 'Turret_Damage', 'Wreck_Hull', 'Wreck_Turret']
images [('Burnt_Normal', (512, 512)), ('Burnt_ORM', (512, 512)), ('Burnt_Base', (512, 512)), ('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]

context compacted
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/bin/bash -lc 'tail -5 /tmp/t55-verify.py; ls -lh *.glb *.png' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
 for im in g.get('images',[]):
  v=g['bufferViews'][im['bufferView']];off=v.get('byteOffset',0);img=Image.open(io.BytesIO(bin[off:off+v['byteLength']]));sizes.append((im.get('name'),img.size))
 print('images',sizes)
 for m in g['materials']:
  if m.get('name')=='Paint':print('paint',m['pbrMetallicRoughness'].get('baseColorFactor'))
-rw-r--r-- 1 claude-agent claude-agent 1.8M Oct 11 16:38 clay.png
-rw-r--r-- 1 claude-agent claude-agent 2.0M Oct 11 16:38 final.png
-rw-r--r-- 1 claude-agent claude-agent 930K Oct 11 16:38 pivots.png
-rw-r--r-- 1 claude-agent claude-agent 1.8M Oct 11 16:38 side.png
-rw-r--r-- 1 claude-agent claude-agent 5.6M Oct 11 16:38 t55-tank-damage.glb
-rw-r--r-- 1 claude-agent claude-agent 8.1M Oct 11 16:38 t55-tank.glb

2026-10-11T16:40:39.469860Z ERROR codex_core::tools::router: error=write_stdin failed: Unknown process id 1585
codex
The first render has the right layout, but the finish is too clean and the wheels and tracks look too light. I’m correcting those before accepting it. Both GLBs are now within their triangle, texture and file-size limits.

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/bin/bash -lc "scp gex44:/root/fal-author/t55-tank-v1/{states.png,paints.png,NOTES.md,textures/Paint_Base.png} /tmp/ && sed -n '1,220p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 1 in 3802ms:
scp: /root/fal-author/t55-tank-v1/states.png: No such file or directory
scp: /root/fal-author/t55-tank-v1/NOTES.md: No such file or directory

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/bin/bash -lc "sed -n '1,225p' build_t55-tank.py; ssh gex44 tail -15 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 472ms:
import bpy, bmesh, math, os, json, random, urllib.request, struct, sys
from mathutils import Vector, Matrix
from pathlib import Path
from math import sin, cos, pi
ROOT=Path(__file__).resolve().parent
os.chdir(ROOT); random.seed(55)
bpy.ops.object.select_all(action='SELECT'); bpy.ops.object.delete(use_global=False)
S=bpy.context.scene
S.render.engine='CYCLES'; S.cycles.samples=24; S.cycles.use_denoising=True
prefs=bpy.context.preferences.addons['cycles'].preferences
prefs.compute_device_type='OPTIX'; prefs.get_devices()
for d in prefs.devices: d.use=d.type!='CPU'
S.cycles.device='GPU'; S.render.image_settings.file_format='PNG'
S.world.color=(.25,.25,.25)
texdir=ROOT/'textures'; texdir.mkdir(exist_ok=True)
IDS=['green_metal_rust','rusty_metal','rubberized_track','bark_brown_02']
def download(id,mp):
 p=texdir/f'{id}_{mp}_1k.jpg'
 if not p.exists():
  url=f'https://dl.polyhaven.org/file/ph-assets/Textures/jpg/1k/{id}/{id}_{mp}_1k.jpg'
  req=urllib.request.Request(url,headers={'User-Agent':'Mozilla/5.0'})
  with urllib.request.urlopen(req) as r: p.write_bytes(r.read())
 return str(p)
for id in IDS:
 for mp in ['diff','nor_gl','arm']: download(id,mp)

def node(mat,typ):return mat.node_tree.nodes.new(typ)
def link(mat,a,out,b,inp):mat.node_tree.links.new(a.outputs[out],b.inputs[inp])
def image_node(m,path,non=False):
 n=node(m,'ShaderNodeTexImage'); n.image=bpy.data.images.load(path,check_existing=True)
 if non:n.image.colorspace_settings.name='Non-Color'
 return n
# Bake reusable tile materials on a UV plane. No runtime procedural nodes.
M={}
recipes=[('Paint','green_metal_rust',(.87,.87,.87),.12,.78),('Rubber','rubberized_track',(.025,.027,.025),.0,.9),('TrackSteel','rusty_metal',(.12,.105,.085),.65,.79),('Metal','rusty_metal',(.12,.13,.12),.72,.55),('Canvas','rubberized_track',(.19,.15,.10),0,.95),('Wood','bark_brown_02',(.24,.16,.09),0,.88),('Lamps','green_metal_rust',(.16,.19,.16),.3,.24),('Interior','rusty_metal',(.012,.015,.013),0,.98),('Burnt','rusty_metal',(.075,.065,.055),.35,.94),('Scars','rusty_metal',(.19,.18,.16),.7,.65)]
for name,id,col,metal,rough in recipes:
 m=bpy.data.materials.new(name+'_source');m.use_nodes=True
 nt=m.node_tree;nt.nodes.clear();out=node(m,'ShaderNodeOutputMaterial'); bs=node(m,'ShaderNodeBsdfPrincipled');link(m,bs,'BSDF',out,'Surface')
 diff=image_node(m,download(id,'diff'));bw=node(m,'ShaderNodeRGBToBW');link(m,diff,'Color',bw,'Color')
 ramp=node(m,'ShaderNodeValToRGB');link(m,bw,'Val',ramp,'Fac')
 ramp.color_ramp.elements[0].position=.08;ramp.color_ramp.elements[1].position=.7
 if name=='Paint':
  ramp.color_ramp.elements[0].color=(.38,.38,.38,1);ramp.color_ramp.elements[1].color=(.91,.91,.91,1)
 else:
  ramp.color_ramp.elements[0].color=tuple(c*.35 for c in col)+(1,);ramp.color_ramp.elements[1].color=tuple(min(1,c*1.65) for c in col)+(1,)
 arm=image_node(m,download(id,'arm'),True);arm_sep=node(m,'ShaderNodeSeparateColor');link(m,arm,'Color',arm_sep,'Color')
 noise=node(m,'ShaderNodeTexNoise');noise.inputs['Scale'].default_value=145;noise.inputs['Detail'].default_value=3
 mix=node(m,'ShaderNodeMixRGB');mix.blend_type='MULTIPLY';mix.inputs[0].default_value=.18;link(m,ramp,'Color',mix,1);link(m,noise,'Fac',mix,2)
 link(m,mix,'Color',bs,'Base Color');bs.inputs['Metallic'].default_value=metal;bs.inputs['Roughness'].default_value=rough
 norm=image_node(m,download(id,'nor_gl'),True);nn=node(m,'ShaderNodeNormalMap');nn.inputs['Strength'].default_value=.32;link(m,norm,'Color',nn,'Color')
 bump=node(m,'ShaderNodeBump');bump.inputs['Strength'].default_value=.2;bump.inputs['Distance'].default_value=.0018;link(m,noise,'Fac',bump,'Height');link(m,nn,'Normal',bump,'Normal');link(m,bump,'Normal',bs,'Normal')
 bpy.ops.mesh.primitive_plane_add(size=2);p=bpy.context.object;p.data.materials.append(m)
 maps={}
 for mode,size in [('Base',1024 if name=='Paint' else 512),('Normal',512),('ORM',512)]:
  im=bpy.data.images.new(name+'_'+mode,width=size,height=size,alpha=False);im.filepath_raw=str(texdir/(name+'_'+mode+'.png'));im.file_format='PNG'
  if mode!='Base':im.colorspace_settings.name='Non-Color'
  target=node(m,'ShaderNodeTexImage');target.image=im;nt.nodes.active=target
  S.cycles.samples=8
  if mode=='Normal':
   link(m,bs,'BSDF',out,'Surface');bpy.ops.object.bake(type='NORMAL',margin=8)
  else:
   em=node(m,'ShaderNodeEmission')
   if mode=='Base':link(m,mix,'Color',em,'Color')
   else:
    comb=node(m,'ShaderNodeCombineColor');comb.inputs[0].default_value=1;comb.inputs[1].default_value=rough;comb.inputs[2].default_value=metal
    rr=node(m,'ShaderNodeMapRange');rr.inputs['From Min'].default_value=0;rr.inputs['From Max'].default_value=1;rr.inputs['To Min'].default_value=max(.1,rough-.18);rr.inputs['To Max'].default_value=min(1,rough+.08);link(m,arm_sep,'Green',rr,'Value');link(m,rr,'Result',comb,1)
    aa=node(m,'ShaderNodeMapRange');aa.inputs['To Min'].default_value=.72;aa.inputs['To Max'].default_value=1;link(m,arm_sep,'Red',aa,'Value');link(m,aa,'Result',comb,0);link(m,comb,'Color',em,'Color')
   link(m,em,'Emission',out,'Surface');bpy.ops.object.bake(type='EMIT',margin=8)
  im.save();maps[mode]=im
 bpy.data.objects.remove(p,do_unlink=True);bpy.data.materials.remove(m)
 m=bpy.data.materials.new(name);m.use_nodes=True;bs=m.node_tree.nodes.get('Principled BSDF')
 n=node(m,'ShaderNodeTexImage');n.image=maps['Base'];link(m,n,'Color',bs,'Base Color')
 n=node(m,'ShaderNodeTexImage');n.image=maps['Normal'];nn=node(m,'ShaderNodeNormalMap');link(m,n,'Color',nn,'Color');link(m,nn,'Normal',bs,'Normal')
 n=node(m,'ShaderNodeTexImage');n.image=maps['ORM'];sep=node(m,'ShaderNodeSeparateColor');link(m,n,'Color',sep,'Color');link(m,sep,'Green',bs,'Roughness');link(m,sep,'Blue',bs,'Metallic')
 # glTF's occlusion socket convention
 group=bpy.data.node_groups.get('glTF Material Output')
 if not group:
  group=bpy.data.node_groups.new('glTF Material Output','ShaderNodeTree');group.interface.new_socket(name='Occlusion',in_out='INPUT',socket_type='NodeSocketFloat')
 gn=node(m,'ShaderNodeGroup');gn.node_tree=group;link(m,sep,'Red',gn,'Occlusion')
 M[name]=m
 print('BAKED',name,flush=True)
S.cycles.samples=24

# Geometry created in Z-up: front is -Y, tank left +X. Mesh origins are set without applying moving-node transforms.
def matobj(o,mat):o.data.materials.append(M[mat]);return o
def apply(o):
 bpy.context.view_layer.objects.active=o;o.select_set(True)
 for mod in list(o.modifiers):bpy.ops.object.modifier_apply(modifier=mod.name)
 bpy.ops.object.transform_apply(location=False,rotation=True,scale=True);o.select_set(False)
 return o
def bevel(o,w=.012,seg=1):
 mod=o.modifiers.new('Machined edge radius','BEVEL');mod.width=w;mod.segments=seg
 return o
def box(loc,dim,mat='Paint',bev=.012):
 bpy.ops.mesh.primitive_cube_add(size=1,location=loc);o=bpy.context.object;o.dimensions=dim
 bpy.ops.object.transform_apply(location=False,rotation=False,scale=True)
 if bev:bevel(o,bev,3 if bev>=.05 else 1)
 return matobj(o,mat)
def cyl(loc,r,depth,mat='Paint',axis='Z',verts=32,r2=None):
 if r2 is None:bpy.ops.mesh.primitive_cylinder_add(vertices=verts,radius=r,depth=depth,location=loc)
 else:bpy.ops.mesh.primitive_cone_add(vertices=verts,radius1=r,radius2=r2,depth=depth,location=loc)
 o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 bevel(o,.005,1);matobj(o,mat)
 for f in o.data.polygons:f.use_smooth=len(f.vertices)==4
 return o
def uvball(loc,scale,mat='Paint',seg=32,rings=16):
 bpy.ops.mesh.primitive_uv_sphere_add(segments=seg,ring_count=rings,radius=1,location=loc);o=bpy.context.object;o.scale=scale
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def mesh(name,vs,fs,mat='Paint',smooth=False):
 me=bpy.data.meshes.new(name);me.from_pydata(vs,[],fs);me.update();o=bpy.data.objects.new(name,me);bpy.context.collection.objects.link(o);matobj(o,mat)
 for f in me.polygons:f.use_smooth=smooth
 return o
def tube(points,r=.012,mat='Paint',n=8):
 cu=bpy.data.curves.new('formed tube','CURVE');cu.dimensions='3D';cu.resolution_u=1;cu.bevel_depth=r;cu.bevel_resolution=1;cu.resolution_u=1
 sp=cu.splines.new('POLY');sp.points.add(len(points)-1)
 for v,p in zip(sp.points,points):v.co=(*p,1)
 o=bpy.data.objects.new('tube',cu);bpy.context.collection.objects.link(o);o.data.materials.append(M[mat]);bpy.context.view_layer.objects.active=o;o.select_set(True);bpy.ops.object.convert(target='MESH');o.select_set(False);return o
def ring(loc,r,minor=.014,mat='Paint',axis='Z',seg=48):
 bpy.ops.mesh.primitive_torus_add(major_segments=seg,minor_segments=6,location=loc,major_radius=r,minor_radius=minor);o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def bolt(loc,axis='Z',r=.018,mat='Metal'):return cyl(loc,r,.014,mat,axis,6)
def join(objs,name,pivot=(0,0,0),parent=None):
 objs=[o for o in objs if o]
 bpy.ops.object.select_all(action='DESELECT')
 for o in objs:apply(o)
 for o in objs:o.select_set(True)
 bpy.context.view_layer.objects.active=objs[0];bpy.ops.object.join();o=bpy.context.object;o.name=name
 # Move mesh to desired pivot while retaining world coordinates.
 wm=o.matrix_world.copy(); inv=Matrix.Translation(Vector(pivot)).inverted()
 o.data.transform(inv@wm);o.matrix_world=Matrix.Translation(Vector(pivot))
 # World-scale planar UVs on each face, preserving existing UVs is not needed except track override below.
 for old_uv in list(o.data.uv_layers):o.data.uv_layers.remove(old_uv)
 uv=o.data.uv_layers.new(name='UVMap');uv.active_render=True
 for f in o.data.polygons:
  no=f.normal;ax=max(range(3),key=lambda i:abs(no[i]));ij=[i for i in range(3) if i!=ax]
  for li in f.loop_indices:
   co=o.data.vertices[o.data.loops[li].vertex_index].co+Vector(pivot);uv.data[li].uv=(co[ij[0]]*.75,co[ij[1]]*.75)
 if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm
 o.select_set(False);return o
def empty(name,pos,parent=None):
 o=bpy.data.objects.new(name,None);bpy.context.collection.objects.link(o);o.location=pos
 if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm
 return o
parts=[];wheels=[];hatches=[]
def part(name,objs,parent=None):
 # Surface-volume centroid approximation defines throwable item's independent origin.
 bpy.context.view_layer.update();corners=[o.matrix_world@Vector(v) for o in objs for v in o.bound_box]
 cen=Vector(tuple((min(v[i] for v in corners)+max(v[i] for v in corners))*.5 for i in range(3)))
 o=join(objs,'Part_'+name,cen,parent);parts.append(o);return o
# Low welded hull with genuine sloping armour.
profile=[(-3.225,.65,1.10),(-3.12,1.20,1.35),(-2.24,1.48,1.37),(2.75,1.48,1.37),(3.225,1.15,1.15),(3.1,.43,1.04),(-2.82,.43,1.04)]
vs=[(s*w,y,z) for s in [-1,1] for y,z,w in profile];N=len(profile)
fs=[tuple(range(N-1,-1,-1)),tuple(range(N,2*N))]+[(i,(i+1)%N,(i+1)%N+N,i+N) for i in range(N)]
hullbits=[bevel(mesh('armoured monocoque',vs,fs),.022),cyl((0,-.3,1.485),1.025,.075,'Metal',verts=64)]
# Weld seams, towing lugs, final-drive housings, suspension arms.
for s in [-1,1]:
 hullbits+=[tube([(s*1.31,-2.34,1.475),(s*1.31,2.7,1.475)],.009,'Metal')]
 for y in [-2.05,-.79,.2,1.19,2.18]:
  hullbits+=[cyl((s*1.075,y,.69),.13,.23,'Metal','X'),tube([(s*1.13,y+.16,.81),(s*1.25,y,.61)],.065,'Metal')]
 for y in [-2.98,2.97]:
  hullbits+=[ring((s*.8,y,.91),.072,.024,'Metal','Y'),box((s*.8,y,.9),(.16,.07,.2))]
 for y in [-2.4,-1.3,0,1.3,2.5]:
  hullbits+=[box((s*1.34,y,1.4),(.12,.17,.12)),bolt((s*1.415,y,1.42),'X')]
# Front spare mounting bosses and driving lamps.
for x in [-.95,.95]:
 for y,z in [(-2.88,1.285),(-2.45,1.44)]:hullbits.append(bolt((x,y,z)))
for x in [-.99,.99]:
 hullbits += [cyl((x,-2.40,1.56),.095,.15,'Metal','Y'),cyl((x,-2.485,1.56),.076,.008,'Lamps','Y')]
hull=join(hullbits,'Hull')
# Cast dome: elliptical rings with asymmetric fore-aft radii, thick closed base.
T=(0,-.28,1.51);v=[];f=[]
levels=[(0,1.13,1.24),(.06,1.20,1.32),(.18,1.205,1.31),(.39,1.14,1.24),(.61,1.01,1.10),(.77,.80,.85),(.86,.49,.56),(.885,.08,.12)]
for j,(z,rx,ry) in enumerate(levels):
 for k in range(64):
  a=2*pi*k/64;v.append((rx*cos(a),T[1]+ry*sin(a)+.075*z,T[2]+z))
for j in range(len(levels)-1):
 for k in range(64):a=j*64+k;b=j*64+(k+1)%64;f.append((a,b,b+64,a+64))
f += [tuple(range(63,-1,-1)),tuple((len(levels)-1)*64+k for k in range(64))]
tbits=[mesh('cast turret',v,f,smooth=True),ring((0,-.28,1.53),1.10,.028,'Metal',seg=64)]
# Cast seam, welded grab rails, lifting eyes.
for s in [-1,1]:
 tbits += [tube([(s*1.07,-.88,1.96),(s*1.18,-.60,1.91),(s*1.21,-.1,1.90),(s*1.18,.12,1.94)],.018),tube([(s*1.1,.3,1.91),(s*1.08,.58,1.94),(s*.87,.83,2.00)],.018)]
 for y in [-.8,.62]:tbits += [ring((s*.84,y,2.11),.046,.015,'Metal','X')]
turret=join(tbits,'Turret',T)
G=(0,-1.44,1.94)
gun=join([box((0,-1.41,1.95),(.64,.34,.53),'Canvas',.10),cyl((0,-1.62,1.94),.225,.18,'Canvas','Y'),ring((0,-1.721,1.94),.17,.018,'Canvas','Y')],'Gun',G,turret)
# Hollow open-bore barrel as revolved profile; bore cavity continues 0.5m deep.
B=(0,-1.72,1.94)
barprof=[(-1.72,.118),(-1.92,.114),(-4.86,.070),(-4.89,.099),(-5.39,.099),(-5.43,.073),(-5.73,.073),(-5.775,.071),(-5.775,.050),(-5.25,.050)]
v=[];f=[]
for y,r in barprof:
 for k in range(48):a=2*pi*k/48;v.append((r*cos(a),y,1.94+r*sin(a)))
for j in range(len(barprof)-1):
 for k in range(48):a=j*48+k;b=j*48+(k+1)%48;f.append((a,b,b+48,a+48))
barrel=join([mesh('barrel turned steel',v,f,smooth=True),ring((0,-5.41,1.94),.098,.008,'Metal','Y'),ring((0,-4.88,1.94),.099,.006,'Metal','Y')],'Barrel',B,gun)
empty('Muzzle',(0,-5.775,1.94),barrel)
# Wheels: rubber tyres, dished hub, ten recessed windows separated by tapered radial webs.
for s,side in [(1,'L'),(-1,'R')]:
 for wi,y in enumerate([-2.06,-.80,.19,1.18,2.17]):
  z=.57;bits=[]
  for off in [-.115,.115]:
   x=s*(1.32+off);bits += [cyl((x,y,z),.488,.10,'Rubber','X',64),cyl((x+s*.053,y,z),.413,.025,'Paint','X',64),cyl((x+s*.069,y,z),.343,.008,'Interior','X',48),ring((x+s*.073,y,z),.385,.028,'Paint','X',64)]
  x=s*1.52
  for k in range(10):
   a=2*pi*k/10
   ob=box((x,y+.235*sin(a),z+.235*cos(a)),(.05,.082,.27),'Paint',.018);ob.rotation_euler[0]=-a;bits.append(ob)
  bits += [cyl((s*1.53,y,z),.145,.105,'Paint','X',32),cyl((s*1.59,y,z),.088,.012,'Metal','X',24)]
  for k in range(6):a=2*pi*k/6;bits += [bolt((s*1.592,y+.112*sin(a),z+.112*cos(a)),'X',.013)]
  wheels.append(join(bits,f'Wheel_{side}{wi+1}',(s*1.32,y,z)))
 for ind,y in [(6,-2.79),(7,2.79)]:
  z=.73;bits=[cyl((s*1.33,y,z),.345,.26,'Metal','X',48),cyl((s*1.51,y,z),.25,.038,'Interior','X',40),ring((s*1.55,y,z),.31,.030,'Paint','X'),cyl((s*1.56,y,z),.105,.065,'Paint','X')]
  for k in range(12):
   a=2*pi*k/12;ob=box((s*1.54,y+.222*sin(a),z+.222*cos(a)),(.045,.055,.19),'Paint',.009);ob.rotation_euler[0]=-a;bits.append(ob)
   if ind==7:
    ob=box((s*1.34,y+.36*sin(a),z+.36*cos(a)),(.30,.095,.10),'Metal',.012);ob.rotation_euler[0]=-a;bits.append(ob)
  wheels.append(join(bits,f'Wheel_{side}{ind}',(s*1.32,y,z)))
# Tread path: five-wheel bottom contact and wrap around front/rear idler.
path=[]
for i in range(48):
01:37.121  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_1.png'
01:40.373  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_2.png'
01:43.584  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_3.png'
01:46.498  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_4.png'
01:48.018  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_5.png'
01:51.747  render           | Saved: '/root/fal-author/t55-tank-v1/_state_0.png'
Traceback (most recent call last):
  File "/root/fal-author/t55-tank-v1/build_t55-tank.py", line 609, in <module>
    chosen=[p for p in parts if p.name in twins][:6]
                                ^^^^^^
ReferenceError: StructRNA of type Object has been removed

Error: script failed, file: '/root/fal-author/t55-tank-v1/build_t55-tank.py', exiting.

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/bin/bash -lc "sed -n '223,278p' build_t55-tank.py; sed -n '495,660p' build_t55-tank.py; cat /home/claude-agent/.agents/skills/blender-game-assets/references/critic-loop.md" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 1 in 0ms:
# Tread path: five-wheel bottom contact and wrap around front/rear idler.
path=[]
for i in range(48):
 t=i/48;path.append((-2.18+4.36*t,.065))
for i in range(26):
 a=-pi/2+pi*i/26;path.append((2.62+.52*cos(a),.585+.52*sin(a)))
for i in range(55):
 t=i/55;path.append((2.62-5.24*t,1.105-.055*sin(pi*t)))
for i in range(26):
 a=pi/2+pi*i/26;path.append((-2.62+.52*cos(a),.585+.52*sin(a)))
# Resample equal distance link pitch.
lens=[0]
for i in range(len(path)):a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);lens.append(lens[-1]+(b-a).length)
def sample(t):
 d=(t%1)*lens[-1]
 for i in range(len(path)):
  if lens[i+1]>=d:
   a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);p=a.lerp(b,(d-lens[i])/(lens[i+1]-lens[i]));q=(b-a).normalized();return p,q
from mathutils.kdtree import KDTree
track_samples=[sample(j/96) for j in range(96)]
track_kd=KDTree(96)
for j,(p,q) in enumerate(track_samples):track_kd.insert((p[0],p[1],0),j)
track_kd.balance()
tracks=[]
for s,side in [(1,'L'),(-1,'R')]:
 bits=[]
 for i in range(96):
  p,q=sample(i/96);y,z=p;ang=math.atan2(q[1],q[0]);x=s*1.321
  ob=box((x,y,z),(.59,.125,.054),'TrackSteel',.008);ob.rotation_euler[0]=ang;bits.append(ob)
  normal=Vector((-q[1],q[0]))
  for off in [-.18,.18]:
   ob=box((x+off,y-normal[0]*.035,z-normal[1]*.035),(.20,.045,.023),'TrackSteel',.005);ob.rotation_euler[0]=ang;bits.append(ob)
  # Center guide horn faces inwards.
  ob=box((x,y+normal[0]*.065,z+normal[1]*.065),(.045,.07,.10),'Metal',.01);ob.rotation_euler[0]=ang;bits.append(ob)
  bits += [cyl((x+s*.30,y,z),.023,.028,'Metal','X',8)]
 tr=join(bits,'Track_'+side)
 uv=tr.data.uv_layers.active
 # V increases monotonically along nearest track-loop station; width is U.
 for f in tr.data.polygons:
  for li in f.loop_indices:
   co=tr.data.vertices[tr.data.loops[li].vertex_index].co
   idx=track_kd.find((co.y,co.z,0))[1]
   sp,sq=track_samples[idx]
   vv=idx/96+(Vector((co.y,co.z))-sp).dot(sq)/lens[-1]
   uv.data[li].uv=((co.x-s*1.321)/.59+.5,vv)
 low=min(v.co.z for v in tr.data.vertices)
 for v in tr.data.vertices:v.co.z-=low
 tracks.append(tr)
# Sectioned fenders, rolled lips and pressed ribs. No skirts on the T-55.
for s,side in [(1,'L'),(-1,'R')]:
 for end,ya,yb in [('F',-3.18,-.05),('R',-.02,3.20)]:
  bits=[box((s*1.38,(ya+yb)/2,1.31),(.51,yb-ya,.052),'Paint',.022),tube([(s*1.617,ya,1.30),(s*1.617,yb,1.30)],.018)]
  # sloping curved mudguard at end
  ys=[-3.22,-3.13,-2.99,-2.78] if end=='F' else [2.78,2.99,3.13,3.22]
  zs=[.93,1.14,1.28,1.32] if end=='F' else [1.32,1.28,1.14,.93]
  v=[(s*x,y,z) for x in [1.11,1.635] for y,z in zip(ys,zs)]
 (wtbits if ist else whbits).append(c)
for tr in [broken[0],tracks[1]]:
 c=copy_obj(tr);c.data.materials.clear();c.data.materials.append(M['Burnt']);
 for p in c.data.polygons:p.material_index=0
 whbits.append(c)
# Ruptured engine deck plates and dark exposed compartment.
for s in [-1,1]:
 o=box((s*.45,1.65,1.64),(.88,.95,.045),'Burnt',.018);o.rotation_euler[1]=s*.4;whbits.append(o)
whbits.append(cyl((0,-.28,1.13),.96,.09,'Burnt',verts=64))
wh=join(whbits,'Wreck_Hull')
# Cut ring well right through deck geometry, leaving a bottom and thick rim.
cut=cyl((0,-.28,1.69),.98,.96,'Interior',verts=64);apply(cut)
bpy.context.view_layer.objects.active=wh
mod=wh.modifiers.new('Open turret well','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cut
bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
wtbits += [cyl((0,-.28,1.475),1.05,.085,'Burnt',verts=64),cyl((0,-.28,1.27),.62,.37,'Burnt',verts=48),ring((0,-.28,1.09),.61,.045,'Burnt')]
wt=join(wtbits,'Wreck_Turret',T)
for o in [wh,wt]:
 mod=o.modifiers.new('Wreck LOD','DECIMATE');mod.ratio=.36;apply(o)
damage += [wh,wt]
# Damage only allows these five materials. Convert incidental Metal/Canvas/etc to burnt metal.
allowed={'Paint','Burnt','Scars','TrackSteel','Rubber'}
for o in damage:
 if o.type=='MESH':
  for i,m in enumerate(o.data.materials):
   if m.name not in allowed:o.data.materials[i]=M['Burnt']
jb=export(damage,'t55-tank-damage.glb')
print('DAMAGE_EXPORTED',tri_count(damage),flush=True)
# Measure the serialized scene graph in the target Y-up coordinate frame.
def node_manifest(objects):
 bpy.context.view_layer.update();result=[]
 for o in objects:
  p=o.matrix_world.translation;result.append({'name':o.name,'world_position':[round(p.x,5),round(p.z,5),round(-p.y,5)],'parent':o.parent.name if o.parent else None})
 return result
coords=[o.matrix_world@Vector(v) for o in healthy if o.type=='MESH' for v in o.bound_box]
bb={'min':[min(v.x for v in coords),min(v.z for v in coords),min(-v.y for v in coords)],'max':[max(v.x for v in coords),max(v.z for v in coords),max(-v.y for v in coords)]}
meta={'units':'metres','axes':{'up':'+Y','forward':'+Z','left':'+X'},'contract':'tank-damage/v1','bounds':bb,'nodes':node_manifest(healthy),'damage_nodes':node_manifest(damage),'paints':[{'name':n,'linear_rgb':c} for n,c in PAINTS],'triangles':{'healthy':tri_count(healthy),'damage':tri_count(damage),'wreck':tri_count([wh,wt])},'damage':{'parts':[{'part':p.name,'twin':twins.get(p.name)} for p in parts],'scars':scar_names,'broken':{'Track_L':'Track_L_Broken','Track_R':'Track_R_Broken','Gun':'Gun_Broken'},'wreck':['Wreck_Hull','Wreck_Turret']}}
(ROOT/'nodes.json').write_text(json.dumps(meta,indent=2))
# Verify and render solely re-imported GLBs from an empty scene.
bpy.ops.object.select_all(action='SELECT');bpy.ops.object.delete(use_global=False)
for material in list(bpy.data.materials):bpy.data.materials.remove(material)
for ng in list(bpy.data.node_groups):
 if ng.name.startswith('glTF Material Output'):bpy.data.node_groups.remove(ng)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank-damage.glb'));D=[o for o in S.objects if o not in A]
# Blender may suffix the second Paint material; imports faithfully carry the same factor.
def hide_group(objs,hide):
 for o in objs:o.hide_render=hide
hide_group(D,True)
# studio ground, sky and large soft daylight sources
bpy.ops.mesh.primitive_plane_add(size=200,location=(0,0,-.032));ground=bpy.context.object;ground.name='Studio_Ground'
mat=bpy.data.materials.new('Studio');mat.diffuse_color=(.19,.205,.215,1);ground.data.materials.append(mat)
world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.62,.70,.80,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
for name,loc,power,size in [('Daylight',(-4,-6,9),2100,7),('Fill',(5,-1,6),1500,6),('Rim',(0,6,7),2400,5)]:
 data=bpy.data.lights.new(name,'AREA');data.energy=power;data.shape='DISK';data.size=size;o=bpy.data.objects.new(name,data);S.collection.objects.link(o);o.location=loc;o.rotation_euler=(Vector((0,0,1))-o.location).to_track_quat('-Z','Y').to_euler()
camdata=bpy.data.cameras.new('Camera');cam=bpy.data.objects.new('Camera',camdata);S.collection.objects.link(cam);S.camera=cam
cam.location=(9,-12,7);target=Vector((0,-.65,1.1));cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler();camdata.type='ORTHO';camdata.ortho_scale=10.8;camdata.lens=48
S.view_settings.view_transform='AgX';S.render.resolution_percentage=100;S.render.film_transparent=False
S.render.image_settings.color_mode='RGB'
def render(name,w=1920,h=1080,samples=24):
 S.render.resolution_x=w;S.render.resolution_y=h;S.cycles.samples=samples;S.render.filepath=str(ROOT/name);bpy.ops.render.render(write_still=True)
render('final.png')
cam.location=(10,0,3);cam.rotation_euler=(Vector((0,-.85,1.2))-cam.location).to_track_quat('-Z','Y').to_euler()
# exact orthographic side along X
cam.location=(12,-.85,1.3);cam.rotation_euler=(Vector((0,-.85,1.3))-cam.location).to_track_quat('-Z','Y').to_euler();camdata.ortho_scale=10.8
render('side.png',1920,1080)
cam.location=(9,-12,7);cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler()
clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
S.view_layers[0].material_override=clay;render('clay.png');S.view_layers[0].material_override=None
# Exercise every articulated node at 30 degrees, retain a visual evidence render and reset.
moving=[o for o in A if o.name in ['Turret','Gun','Barrel','MG'] or o.name.startswith(('Wheel_','Hatch_'))]
old={o:o.matrix_basis.copy() for o in moving}
for o in moving:
 if o.name=='Barrel':o.location.y+=.13
 else:o.rotation_euler[2 if o.name in ['Turret','MG'] else 0]+=pi/6
render('pivots.png',1280,720,16)
for o,m in old.items():o.matrix_basis=m
# Contact-sheet composition entirely in Blender images (no external renderer).
def sheet(paths,out):
 images=[bpy.data.images.load(str(ROOT/p),check_existing=False) for p in paths];w,h=images[0].size
 import numpy as np
 arr=np.zeros((h*2,w*3,4),dtype=np.float32)
 for i,im in enumerate(images):
  a=np.array(im.pixels[:],dtype=np.float32).reshape(h,w,4);row=1-i//3;col=i%3;arr[row*h:(row+1)*h,col*w:(col+1)*w]=a
 im=bpy.data.images.new(out,width=w*3,height=h*2);im.pixels.foreach_set(arr.ravel());im.filepath_raw=str(ROOT/out);im.file_format='PNG';im.save()
 for im in images:bpy.data.images.remove(im)
# Imported glTF uses a base texture multiply for paint: update the factor socket discovered from links.
pm=[m for m in bpy.data.materials if m.name.startswith('Paint') and m.users]
def set_paint(col):
 for m in pm:
  bs=m.node_tree.nodes.get('Principled BSDF')
  if not bs:continue
  sock=bs.inputs['Base Color']
  if sock.is_linked:
   n=sock.links[0].from_node
   if n.type=='MIX':
    for inp in n.inputs:
     if inp.type=='RGBA' and not inp.is_linked:inp.default_value=(*col,1)
   elif n.type=='MIX_RGB':
    for inp in n.inputs[1:]:
     if not inp.is_linked:inp.default_value=(*col,1)
  else:sock.default_value=(*col,1)
paths=[]
for i,(name,col) in enumerate(PAINTS):
 set_paint(col);p=f'_paint_{i}.png';render(p,640,360,12);paths.append(p)
sheet(paths,'paints.png');set_paint(PAINTS[0][1])
An={o.name:o for o in A};Dn={o.name:o for o in D};statepaths=[]
def reset():hide_group(A,False);hide_group(D,True)
def show(name):
 if name in Dn:Dn[name].hide_render=False
for state in range(6):
 reset()
 if state==1:
  for n in scar_names:show(n)
  chosen=[p for p in parts if p.name in twins][:6]
  for p in chosen:An[p.name].hide_render=True;show(twins[p.name])
 if state==2:
  for o in A:
   if o.name.startswith('Part_'):o.hide_render=True
 if state==3:
  An['Track_L'].hide_render=True;show('Track_L_Broken');An['Gun'].hide_render=True;An['Barrel'].hide_render=True;show('Gun_Broken')
 if state>=4:
  hide_group(A,True);show('Wreck_Hull');show('Wreck_Turret')
 if state==5:
  w=Dn['Wreck_Turret'];wm=w.matrix_world.copy();w.location=(3.25,.4,.90);w.rotation_euler=(.30,2.50,.4)
 p=f'_state_{state}.png';render(p,640,360,16);statepaths.append(p)
 if state==5:w.matrix_world=wm
sheet(statepaths,'states.png')
reset()
# Keep user-facing directory concise: intermediate frame tiles are disposable.
for p in paths+statepaths:(ROOT/p).unlink(missing_ok=True)
(ROOT/'NOTES.md').write_text('\n'.join([
'T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.',
f"Triangles: healthy {meta['triangles']['healthy']:,}; damage {meta['triangles']['damage']:,}; wreck {meta['triangles']['wreck']:,}.",
'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.',
'Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.',
'Poly Haven CC0 IDs: '+', '.join(IDS)+'; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.',
'Reference differences: five road wheels follow the written brief; MG and antenna extend beyond the 2.40 m turret-height envelope; no insignia.'])+'\n')
print('DONE',json.dumps(meta['triangles']),flush=True)
cat: /home/claude-agent/.agents/skills/blender-game-assets/references/critic-loop.md: No such file or directory

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/bin/bash -lc "rg --files /home/claude-agent/.agents/skills/blender-game-assets | head -20; sed -n '275,300p' build_t55-tank.py; sed -n '400,434p' build_t55-tank.py; command -v geminix" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
/home/claude-agent/.agents/skills/blender-game-assets/SKILL.md
/home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py
/home/claude-agent/.agents/skills/blender-game-assets/scripts/erosion/THIRD_PARTY_NOTICES.md
/home/claude-agent/.agents/skills/blender-game-assets/scripts/erosion/erode_terrain.py
/home/claude-agent/.agents/skills/blender-game-assets/scripts/erosion/erosion_np.py
/home/claude-agent/.agents/skills/blender-game-assets/scripts/erosion/PORT-NOTES.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/matlib.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/cabinlib.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/build_hull.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/cinematic.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/build_rocks.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/INDEX.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/clay.py
/home/claude-agent/.agents/skills/blender-game-assets/scripts/__pycache__/audit_glb.cpython-312.pyc
/home/claude-agent/.agents/skills/blender-game-assets/reference/baking-and-diagnostics.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/preflight-and-recovery.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/critic-loop.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/gen_material.py
/home/claude-agent/.agents/skills/blender-game-assets/reference/runtime-parity-and-diagnostics.md
/home/claude-agent/.agents/skills/blender-game-assets/reference/car-paint-flakes.md
  # sloping curved mudguard at end
  ys=[-3.22,-3.13,-2.99,-2.78] if end=='F' else [2.78,2.99,3.13,3.22]
  zs=[.93,1.14,1.28,1.32] if end=='F' else [1.32,1.28,1.14,.93]
  v=[(s*x,y,z) for x in [1.11,1.635] for y,z in zip(ys,zs)]
  ob=mesh('pressed mudguard',v,[(i,i+1,i+5,i+4) for i in range(3)])
  so=ob.modifiers.new('sheet thickness','SOLIDIFY');so.thickness=.022;bevel(ob,.012);bits.append(ob)
  for x in [1.20,1.48,1.57]:bits.append(tube([(s*x,y,z+.015) for y,z in zip(ys,zs)],.009))
  part('Fender_'+end+side,bits)
 # brackets remain behind removed stowage.
 for y in [-1.65,.1,1.85]:
  bs=[box((s*1.41,y,1.445),(.42,.91,.25),'Paint',.022),box((s*1.41,y,1.59),(.445,.935,.035),'Paint',.01)]
  for yy in [y-.32,y+.32]:bs += [box((s*1.615,yy,1.49),(.024,.055,.12),'Metal',.004),bolt((s*1.617,yy,1.49),'X',.013)]
  part(('FuelCell_R' if s==-1 else 'Stowage_L')+str(round((y+2)*10)),bs)
  # retain mounting shoes on actual hull
  pad=join([box((s*1.27,y,1.34),(.19,.76,.048)),bolt((s*1.31,y,1.38))],'mount')
  hull=join([hull,pad],'Hull')
 for x in [s*.99]:
  part('LampGuard_'+side,[tube([(x-.125,-2.56,1.49),(x-.125,-2.55,1.71),(x+.125,-2.55,1.71),(x+.125,-2.56,1.49)],.012),tube([(x,-2.56,1.49),(x,-2.55,1.71)],.008)])
# Rear fuel drums lie transversely, matching the circular end visible in the side reference.
for i,x in enumerate([-.66,.66]):
 bits=[cyl((x,2.77,1.66),.29,.80,'Paint','X',48)]
 for off in [-.40,-.34,-.14,.14,.34,.40]:bits.append(ring((x+off,2.77,1.66),.29,.012,'Metal' if abs(off)==.14 else 'Paint','X'))
 for off in [-.408,.408]:bits.append(cyl((x+off,2.77,1.66),.263,.015,'Paint','X',48))
 bits += [cyl((x,2.73,1.956),.025,.022,'Metal','Z',12)]
 part('FuelDrum_'+str(i+1),bits)
 hull=join([hull,box((x,2.7,1.385),(.65,.45,.10)),tube([(x-.24,2.46,1.43),(x-.30,2.46,1.66)],.018)],'Hull')
  for poly in d.data.polygons:
   if random.random()<.14:
    if M['Burnt'].name not in [m.name for m in d.data.materials]:d.data.materials.append(M['Burnt'])
    poly.material_index=len(d.data.materials)-1
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name
# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
def impact(center,normal,r=.082,penetration=False,project=None):
 n=Vector(normal).normalized();q=Vector((0,0,1)).rotation_difference(n);v=[];f=[]
 # flat outer soot rim, scraped silver rim, dark inward-facing crater floor
 radii=[r*1.9,r*1.16,r*.83,r*.48,0.001];heights=[.0023,.003,.012 if penetration else .004,.003,.003]
 for j,rr in enumerate(radii):
  for k in range(20):
   a=k*2*pi/20;rr2=rr*(1+.13*sin(k*7.13));h=heights[j]+(.013*(k%2) if penetration and j==2 else 0)
   point=Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),0))
   if project:
    point,pn=project(point);point+=pn*h
   else:point+=n*h
   v.append(tuple(point))
 for j in range(4):
  for k in range(20):f.append((j*20+k,j*20+(k+1)%20,(j+1)*20+(k+1)%20,(j+1)*20+k))
 o=mesh('impact',v,f,'Scars');o.data.materials.append(M['Burnt'])
 for p in o.data.polygons:p.material_index=1 if p.index//20 in [0,3] else 0
 # ricochet furrow raised only millimetres from plate
 a=Vector(center)+q@Vector((r*.9,.01,.004));b=Vector(center)+q@Vector((r*2.5,.025,.004))
 return [o,tube([a,b],.004,'Scars')]
scar_names=[]
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  if face=='Front':
   x=-.7+i*.43;y=-2.70+.05*sin(i);z=1.20+(y+3.12)*(.28/.88);c=(x,y,z);normal=(0,-.304,.953)
  elif face=='Rear':
   zz=.72+.10*sin(i);c=(-.72+i*.46,3.1+(zz-.43)/.72*.125,zz);normal=(0,1,-.174)
  else:
   s=1 if face=='L' else -1;c=(s*(1.04+(1.20-.43)/1.05*.33),-1.8+i*1.1,1.20);normal=(s,0,-.314)
/home/claude-agent/bin/geminix

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/bin/bash -lc "cat /home/claude-agent/.agents/skills/blender-game-assets/reference/critic-loop.md | head -90; sed -n '375,405p' build_t55-tank.py; sed -n '1,70p' /home/claude-agent/bin/geminix" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
<!-- Distilled from vercel-labs/vgpu .claude/skills/vgpu-agent-flow/references/asset-iteration.md and
.subharness/agents/asset-author.ts + asset-critic.ts at commit 68cb1d8d198c (MIT, Copyright (c) 2025 Vercel, Inc.),
rewritten for Forge lanes (forge-agent, Astra author, a second model family as critic). -->

# Author and critic loop for a Blender asset

Use this for any authored asset that will be judged by eye: a hero prop, a character, a building, an
environment. Skip it for a mechanical re-export.

## Seats

| Seat | Who | Owns |
| --- | --- | --- |
| Author | Astra (operator law: Blender work goes to Astra) | Geometry, authored materials, UVs, bakes, Blender renders, the export |
| Runtime | The root, or one worker when the shader work is real | Loading the export in the game's actual three.js path, captures, measured costs |
| Critic | A different model family from the author, reading the real images | Findings only. Never edits the asset |

The critic must open the actual capture files. A critic that cannot read images says so and returns
BLOCKED; it never writes a visual verdict from metrics or from the author's description.

## Budget

- Default: **3 revisions, at most 2 critic passes per revision.** The brief may set another cap.
- A cap is an execution limit, not acceptance. Cap reached with open visual findings = `REVISE`
  reported as such, never a `PASS`.
- No unattended improvement loop past the cap.

## Before the first render

Write in the task folder: scope, target cameras (gameplay view, hero, rear, closest required view),
output paths, budgets (triangles, exported vertices, texture bytes and GPU memory, draw calls) and
the revision cap. Budgets are task inputs; do not copy another asset's numbers.

Run the [preflight](preflight-and-recovery.md) once: Blender starts and runs a scene operation, a
tiny bake and export round-trips through the real loader, one real runtime frame is captured.

Integrate a cheap LOW blockout in the runtime at this stage. Scale, axis, camera and material
contract problems are found before an expensive bake, not after.

## Each revision keeps

- the source revision or parameters that rebuild the previous asset;
- real hero, rear and close-up captures, same camera, light, exposure and pose every time;
- triangles, exported vertices, primitives, material count, file bytes, texture GPU memory;
- runtime draw counters, kept apart from offline estimates;
- the critic's findings, the fixes chosen, and the next measured result.

## The critic pass

The critic receives the previous AND the current captures and metrics under matched cameras (or
an explicit "first revision, no baseline"), the reference image, and the brief. It returns:

- **at most five findings**, ordered by impact, each with a stable id, the evidence path (whole
  view plus crop or image coordinates), the visible symptom, a suggested correction and a
  **measurable acceptance condition**;
- regressions against the previous revision;
- resolved / remaining / regressed status of earlier findings on a follow-up pass;
- `PASS`, `REVISE` or `BLOCKED`, with the limits of its evidence.

It compares against the reference as well as the previous revision: clean topology and progress
since last time do not make the asset match the reference. It separates the observed defect from
the suspected cause. A small whole-image difference can hide severe local damage (thin trim,
stairs, silhouette edges): it inspects crops at each delivered LOD. Design ideas are suggestions,
not new acceptance requirements.

When the cause could be the asset or the renderer, it asks for the diagnostic captures in
[runtime parity](runtime-parity-and-diagnostics.md) (maps off, AO neutral, lightmap off) rather
than guessing.

## Rules that stop false passes

- A generated concept image is never proof of a working model. Label concepts as concepts; accept
  only on real renders of the real export.
- Requested bakes need bake provenance (what was baked, from what, at what settings) and matched
  runtime captures with each contribution switched off in turn. Vertex tint and runtime shadows
  are not substitutes for a requested AO or lightmap bake.
- An atlas repair is checked on the full matched views, not only on the crop that was broken: a new
  layout can fix one edge and turn another face black.
- One writer per handoff file. A reply never gets appended to a request file another agent will
  regenerate. Superseded manifests and failed captures stay on disk.
- The author hands the root a compact result: verdict, the few decisive images, the metrics table.
  Full capture sets stay on disk; the root does not load every image.
- A user's rejection or a changed brief reopens any earlier `PASS`.

## Lessons

When a revision teaches something that will recur, write it as: evidence path, symptom, cause,
intervention, matched before/after result, scope. The root checks it and makes a narrow edit to this
skill. Reject task-specific style preferences dressed up as general rules.
 bpy.ops.export_scene.gltf(filepath=str(ROOT/path),export_format='GLB',use_selection=True,export_yup=True,export_apply=True,export_texcoords=True,export_normals=True,export_materials='EXPORT',export_image_format='JPEG',export_jpeg_quality=90,export_cameras=False,export_lights=False,export_extras=True)
 return patch_glb(ROOT/path)
ja=export(healthy,'t55-tank.glb')
print('HEALTHY_EXPORTED',flush=True)
# Damage twins retain exactly the healthy part origins and the same local frame.
def copy_obj(o,name=None):
 n=o.copy();n.data=o.data.copy() if o.data else None;bpy.context.collection.objects.link(n);n.parent=None;n.matrix_world=o.matrix_world.copy()
 if name:n.name=name
 return n
def parent_world(o,p):
 wm=o.matrix_world.copy();o.parent=p;o.matrix_world=wm
HD=empty('Hull_Damage',(0,0,0));TD=empty('Turret_Damage',T)
damage=[HD,TD];twins={}
for p in parts:
 if any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum','EngineGrille','ExhaustShroud','Turret_IR','Turret_Sight','Turret_Cupola']):
  d=copy_obj(p,p.name.replace('Part_','Dmg_'));vlist=d.data.vertices
  # Bend sheet extremities, crush barrels and wrench mounted fixtures from their seats.
  extent=max((v.co.length for v in vlist),default=1)
  for v in vlist:
   x,y,z=v.co;fall=max(0,(abs(y)/max(.01,extent)-.15))
   if 'Fender' in p.name:v.co.z+=.34*fall*sin(y*2.1);v.co.x+=.13*fall
   elif 'FuelDrum' in p.name:v.co.x+=.085*sin(y*10+z*8);v.co.z-=.075*(1+sin(y*8))
   elif 'Grille' in p.name:v.co.z+=.16*max(0,sin(x*4+y*5))
   else:v.co.z+=.09*sin(y*7+x*4);v.co.x+=.055*sin(z*12+y*5)
  # torn black/steel section carried on twin itself
  for poly in d.data.polygons:
   if random.random()<.14:
    if M['Burnt'].name not in [m.name for m in d.data.materials]:d.data.materials.append(M['Burnt'])
    poly.material_index=len(d.data.materials)-1
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name
# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
#!/bin/sh
# geminix — one-shot / scriptable:  geminix "prompt"   |   geminix < file.md
# With no prompt and a terminal on stdin there is nothing to answer, so start
# the interactive session instead of failing.
if [ $# -eq 0 ] && [ -t 0 ]; then
  echo "geminix: no prompt given, starting the interactive session" >&2
  exec "$HOME/bin/forge-gemini"
fi
exec "$HOME/bin/forge-gemini" -p "$@"

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/bin/bash -lc "cat > /tmp/t55-polish.py <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text()
s=s.replace(\"('Metal','rusty_metal',(.12,.13,.12),.72,.55)\",\"('Metal','rusty_metal',(.032,.035,.03),.68,.69)\")
s=s.replace(\"ramp.color_ramp.elements[0].position=.08;ramp.color_ramp.elements[1].position=.7\",\"ramp.color_ramp.elements[0].position=.12;ramp.color_ramp.elements[1].position=.38\")
s=s.replace(\"(.38,.38,.38,1)\",\"(.12,.12,.12,1)\")
s=s.replace(\"link(m,mix,'Color',bs,'Base Color');\", \"\"\"# Broad worn patches and rain streaks are baked into the reusable neutral paint tile.
 grain=node(m,'ShaderNodeTexNoise');grain.inputs['Scale'].default_value=9;grain.inputs['Detail'].default_value=5;grain.inputs['Roughness'].default_value=.78
 dirt=node(m,'ShaderNodeValToRGB');link(m,grain,'Fac',dirt,'Fac');dirt.color_ramp.elements[0].position=.30;dirt.color_ramp.elements[0].color=(.09,.09,.09,1);dirt.color_ramp.elements[1].position=.64;dirt.color_ramp.elements[1].color=(1,1,1,1)
 weather=node(m,'ShaderNodeMixRGB');weather.blend_type='MULTIPLY';weather.inputs[0].default_value=.72;link(m,mix,'Color',weather,1);link(m,dirt,'Color',weather,2)
 tc=node(m,'ShaderNodeTexCoord');mapping=node(m,'ShaderNodeVectorMath');mapping.operation='MULTIPLY';mapping.inputs[1].default_value=(55,3,1);link(m,tc,'UV',mapping,0)
 streak=node(m,'ShaderNodeTexNoise');streak.inputs['Scale'].default_value=1;streak.inputs['Detail'].default_value=3;link(m,mapping,'Vector',streak,'Vector')
 sr=node(m,'ShaderNodeValToRGB');link(m,streak,'Fac',sr,'Fac');sr.color_ramp.elements[0].position=.32;sr.color_ramp.elements[0].color=(.15,.15,.15,1);sr.color_ramp.elements[1].position=.48
 finalmix=node(m,'ShaderNodeMixRGB');finalmix.blend_type='MULTIPLY';finalmix.inputs[0].default_value=.42 if name=='Paint' else .2;link(m,weather,'Color',finalmix,1);link(m,sr,'Color',finalmix,2)
 link(m,finalmix,'Color',bs,'Base Color');\"\"\")
s=s.replace(\"if mode=='Base':link(m,mix,'Color',em,'Color')\",\"if mode=='Base':link(m,finalmix,'Color',em,'Color')\")
s=s.replace(\"nn.inputs['Strength'].default_value=.32\",\"nn.inputs['Strength'].default_value=.75\")
s=s.replace(\"bump.inputs['Strength'].default_value=.2;bump.inputs['Distance'].default_value=.0018\",\"bump.inputs['Strength'].default_value=.45;bump.inputs['Distance'].default_value=.004\")
# Rounded canvas mantle with physical radial folds.
a=s.index(\"gun=join([box(\");b=s.index(\"# Hollow open-bore\",a)
s=s[:a]+\"\"\"mantle=[uvball((0,-1.42,1.95),(.34,.20,.27),'Canvas',40,20),cyl((0,-1.62,1.94),.205,.18,'Canvas','Y'),ring((0,-1.721,1.94),.16,.014,'Canvas','Y')]
for k in range(14):
 a=2*pi*k/14
 mantle.append(tube([(.29*cos(a),-1.48,1.95+.24*sin(a)),(.24*cos(a),-1.59-.02*sin(a*3),1.95+.20*sin(a)),(.17*cos(a),-1.71,1.94+.17*sin(a))],.009,'Canvas'))
gun=join(mantle,'Gun',G,turret)
\"\"\"+s[b:]
s=s.replace(\"z=.57;bits=[]\",\"z=.555;bits=[]\")
s=s.replace(\".413,.025,'Paint'\",\".402,.025,'Paint'\").replace(\".385,.028,'Paint'\",\".367,.035,'Paint'\")
a=s.index('  for k in range(10):');b=s.index('  bits += [cyl((s*1.53',a)
s=s[:a]+\"\"\"  # Five broad dished cast spokes, a starfish casting rather than flat wagon spokes.
  for k in range(5):
   a=2*pi*k/5;vv=[]
   for rad,wid,xx in [(.105,.075,1.58),(.245,.115,1.55),(.37,.067,1.505)]:
    for sign in [-1,1]:vv.append((s*xx,y+rad*sin(a)+sign*wid*cos(a),z+rad*cos(a)-sign*wid*sin(a)))
   ob=mesh('cast radial web',vv,[(0,1,3,2),(2,3,5,4)],smooth=True)
   mod=ob.modifiers.new('cast web thickness','SOLIDIFY');mod.thickness=.036
   bevel(ob,.018,3);bits.append(ob)
\"\"\"+s[b:]
# More accurate track approach, wrap kept tight to idler/sprocket.
a=s.index('path=[]');b=s.index('# Resample equal distance',a)
s=s[:a]+\"\"\"path=[]
for i in range(48):
 t=i/48;path.append((-2.17+4.34*t,.052))
path.append((2.36,.14));path.append((2.99,.405))
for i in range(26):
 a=-pi/3+(5*pi/6)*i/26;path.append((2.79+.39*cos(a),.73+.39*sin(a)))
for i in range(55):
 t=i/55;path.append((2.79-5.58*t,1.12-.065*sin(pi*t)))
for i in range(26):
 a=pi/2+(5*pi/6)*i/26;path.append((-2.79+.39*cos(a),.73+.39*sin(a)))
path.append((-2.36,.14))
\"\"\"+s[b:]
s=s.replace(\"(.59,.125,.054)\",\"(.59,.141,.054)\")
s=s.replace(\"normal[0]*.065,z+normal[1]*.065),(.045,.07,.10)\",\"normal[0]*.046,z+normal[1]*.046),(.045,.065,.07)\")
# Curved mudguards.
s=s.replace(\"ys=[-3.22,-3.13,-2.99,-2.78] if end=='F' else [2.78,2.99,3.13,3.22]\\n  zs=[.93,1.14,1.28,1.32] if end=='F' else [1.32,1.28,1.14,.93]\",\"yz=[(-2.76-.49*sin(i*pi/24),.88+.44*cos(i*pi/24)) for i in range(13)]\\n  if end=='R':yz=[(-y,z) for y,z in reversed(yz)]\\n  ys=[p[0] for p in yz];zs=[p[1] for p in yz]\")
s=s.replace(\"[(i,i+1,i+5,i+4) for i in range(3)]\",\"[(i,i+1,i+14,i+13) for i in range(12)]\")
s=s.replace(\"chosen=[p for p in parts if p.name in twins][:6]\\n  for p in chosen:An[p.name].hide_render=True;show(twins[p.name])\",\"chosen=list(twins)[:6]\\n  for p in chosen:An[p].hide_render=True;show(twins[p])\")
s=s.replace(\"cam.location=(9,-12,7)\",\"cam.location=(9,-12,5.9)\")
s=s.replace(\"('Fill',(5,-1,6),1500,6)\",\"('Fill',(5,-1,6),850,6)\")
p.write_text(s)
PY
python /tmp/t55-polish.py
python -m py_compile build_t55-tank.py
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "ssh gex44 \"pgrep -af '[b]lender.*fal-author/t55-tank-v1/build_t55'\"; python3 /tmp/t55-polish.py; python3 -m py_compile build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 702ms:
1434426 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1434427 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py

codex
The independent visual review confirmed five issues: surface wear, wheel castings, track wrap, the mantlet cover and front fender curvature. The next build addresses all five. I also found and fixed an error in the damage-state proof renderer.

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/bin/bash -lc "scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py; ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log; cat /home/claude-agent/AGENTS.md | rg -n 'coord|claim' | head -15; ls -la | head -20" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1629ms:
28:- **local** `204.168.129.84` — orchestrator. Opus planning, this memory store, the `coord` bus. No app/infra runs here.
62:- **Usable result before tooling expansion:** define the smallest visible end-to-end outcome and deliver it early. Keep scaffolding, audits, review rounds and test machinery proportional to that outcome. Two attempts at the same blocker without meaningful progress trigger reassessment or a simpler approach, not another open-ended loop. Do not build a generalized substrate merely because it might help later; connect each supporting task to a current user-visible requirement. Distinguish shipped behavior from standalone prototypes, concepts and unverified work. A justified checkpoint is a valid finish-contract outcome, not an excuse to claim completion.
66:- **Visual quality is the product**: every change touching templates/prompts must be visually validated before claiming success. "It builds and deploys" ≠ "it looks right".
68:- **Shared harness across models:** agentic workers must receive the same applicable project rules, task-relevant skills, authorized tool/MCP access, coordination and secret guards through their adapter. Load skills selectively, not all at once. Preserve isolation and task-specific permissions; equal harness support does not grant broader authority. Missing wiring is an adapter gap to report or fix, not a reason to declare a model incapable. Verify the chosen lane rather than assuming every helper inherits the full setup.
69:- **Worker model selection:** choose and explicitly pass the least expensive capable model for each task; do not copy the root model/effort automatically or mix models just for variety. Gemini 3.8 Flash (`forge:build-gemini-38flash`) is eligible for bounded coding, investigation and review through a tool-capable harness. Local builders use `forge-agent run --harness gemini --model forge:build-gemini-38flash --repo <repo> --purpose <task> --task <brief>` with a bounded `--timeout`; this runs Claude Code with copied shared skills/rules/hooks, Forge MCP and isolated proxy auth. Proven locally with actual Gemini responses, MCP skill/coord calls, file edits, tests and a blocked secret-guard probe. `--harness gemini-proxy` remains the single-shot no-tools helper for tasks that need no tools. The local Gemini builder currently rejects optional `--jail`; never imply that it ran in a container sandbox. Use `gpt-5.6-luna` for narrow mechanical work, `gpt-5.6-terra` for exploration and bounded implementation, `gpt-6.1-sol` (Sol) for demanding implementation/debugging/review, and `gpt-6-astra` for unusually difficult architecture or reasoning. **Sol = `gpt-6.1-sol` (operator, 2026-09-30):** every Sol request runs GPT-6.1 Sol (Codex CLI >= 0.159.2; 0.156 gets a 400). `sol`/`solx` call it, and the Engine swaps `gpt-6-sol` and `gpt-5.6-sol` for it at launch (`cli/sonnet_retire.py` LATEST_VERSION, also inside `run_tracked_codex_cli`). `gpt-6-luna` (Codex CLI >= 0.156.0) is the GPT-6 option for the Luna tier; not benchmarked yet, so `gpt-5.6-luna` stays the Luna default until a measured run shows it is worth its cost. Claude CLI workers use `--model sonnet`, which is **Sonnet 5.5 only** on this box (alias pinned in `~/.claude/settings.json` since 2026-09-28; never Sonnet 5; the Engine still remaps Sonnet to Opus 5.5). **Haiku 5.5 (2026-10-08):** `--model haiku` = `claude-haiku-5-5` everywhere (alias pinned in `~/.claude/settings.json`; the Engine seam upgrades `haiku`/`claude-haiku-4-5` at launch): $0.10 in / $0.50 out per MTok, 1M context, default effort medium. Use it for classification, extraction, routing, yes/no gates, judges and cheap subagents at effort low or medium; `haikux "prompt"` one-shot, `review --by haiku` for the cheapest second look (same family, not independent), panel seat `haiku-local`. Always pass `--effort`: low for mechanical edits, medium by default, high only for creative or hard work (and for benchmarks, the same effort as the run it is compared with). Native Codex defaults are Terra/medium; explicitly select low effort for straightforward tasks and high only where the reasoning warrants it. Prefer a different family for independent judgment when useful. Escalate after evidence of a capability limit instead of repeated cheap retries; name unavailable models and use a supported alternative. Codex mixed-model spawns use `fork_turns="none"` with a self-contained brief; full-history forks inherit the parent's model and effort.
76:(safety = the PreToolUse secret + coordination guards, not a sandbox):
95:store, coordination protocol, standing laws; `forge-hub/agent/harness_env.py`),
97:memory/skills/coordination. Docs: `forge-hub/agent/DEEPSEEK.md`, `GEMINI.md`.
148:**Max plan API credits (2026-10-08):** each Max 20x plan gives $200/month (Max 5x $100) of Claude Platform credit, claimed on
152:Not claimed yet. Memory `reference_max_plan_monthly_api_credits_2026_10_08.md`.
174:- Task agents from Claude, GPT, Gemini or DeepSeek: `forge-agent run --harness deepseek --model deepseek-flash --repo <git-repo> --purpose <task> --task <brief> --timeout 900`. Same isolated worktrees, shared Forge MCP memory/skills/coord, hooks and finish rules. DeepSeek orchestrators can call the other `forge-agent` harnesses; workers do not recursively delegate.
175:- Thin adapter: `forge-hub/agent/deepseek_worker.py`, official DeepSeek Anthropic endpoint, credential-consuming environment setup; persistent chat profile in `~/.local/share/forge-deepseek/profile`. No new agent loop. Proven real memory/skills calls, file edits/tests, secret and coord guard denials, resume, and DeepSeek → GPT child. No Docker jail support on this local lane.
212:- **Never:** anything with uncommitted edits, a live process in it, or a live coord claim; other sessions' dirs
216:  If unsure whose it is, leave it and `coord note` it.
228:## Multi-Claude coordination (durable)
total 21512
drwxrwxr-x  3 claude-agent claude-agent    4096 Oct 11 16:38 .
drwxrwxr-x 94 claude-agent claude-agent    4096 Oct 11 15:29 ..
-rw-rw-r--  1 claude-agent claude-agent   11216 Oct 11 16:11 PROMPT.txt
drwxrwxr-x  2 claude-agent claude-agent    4096 Oct 11 16:42 __pycache__
-rw-rw-r--  1 claude-agent claude-agent  259712 Oct 11 16:42 astra.log
-rw-rw-r--  1 claude-agent claude-agent   43505 Oct 11 16:42 build_t55-tank.py
-rw-r--r--  1 claude-agent claude-agent 1813732 Oct 11 16:38 clay.png
-rw-r--r--  1 claude-agent claude-agent 2057130 Oct 11 16:38 final.png
-rw-rw-r--  1 claude-agent claude-agent    8923 Oct 11 15:20 job.json
-rw-r--r--  1 claude-agent claude-agent   17626 Oct 11 16:38 nodes.json
-rw-r--r--  1 claude-agent claude-agent  951346 Oct 11 16:38 pivots.png
-rw-rw-r--  1 claude-agent claude-agent  680596 Oct 11 15:22 sheet.jpg
-rw-rw-r--  1 claude-agent claude-agent      43 Oct 11 15:22 sheet.log
-rw-rw-r--  1 claude-agent claude-agent     951 Oct 11 15:20 sheet_prompt.txt
-rw-r--r--  1 claude-agent claude-agent 1868363 Oct 11 16:38 side.png
-rw-rw-r--  1 claude-agent claude-agent      21 Oct 11 16:11 started.txt
-rw-r--r--  1 claude-agent claude-agent 5781316 Oct 11 16:38 t55-tank-damage.glb
-rw-r--r--  1 claude-agent claude-agent 8462560 Oct 11 16:38 t55-tank.glb

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "sed -n '333,380p' build_t55-tank.py; sed -n '450,511p' build_t55-tank.py; sed -n '228,268p' /home/claude-agent/AGENTS.md; ssh gex44 tail -5 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 592ms:
part('Tools',[tube([(1.4,-.72,1.66),(1.4,.55,1.66)],.02,'Wood'),box((1.4,.65,1.65),(.23,.29,.042),'Metal',.04),tube([(1.52,-.67,1.66),(1.52,.4,1.66)],.018,'Metal')])
part('SpareLinks',[box((x,-3.08,1.10),(.32,.09,.23),'TrackSteel',.01) for x in [-.5,-.16,.18,.52]])
# Hatches with dark cupped wells, raised coamings and hinge pins.
for name,pos,r,parent in [('Commander',(.49,-.12,2.35),.295,turret),('Loader',(-.47,-.05,2.33),.29,turret),('Driver',(.58,-2.14,1.48),.245,None)]:
 x,y,z=pos
 # True recessed crew hatch aperture with a dark closed well below the hinge.
 base=turret if parent else hull
 cutter=cyl((x,y,z+.08),r*.86,.48,'Interior',verts=48);apply(cutter)
 bpy.context.view_layer.objects.active=base
 mod=base.modifiers.new('Crew hatch opening','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cutter
 bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cutter,do_unlink=True)
 # visible coaming encloses a dark cup with its floor below the armoured deck.
 well=join([cyl((x,y,z-.16),r*.86,.035,'Interior'),ring((x,y,z),r,.022,'Paint')],name+'_well',pos,parent)
 if parent:turretbits=None
 else:hull=join([hull,well],'Hull')
 if parent:
  # merge well into turret without disturbing pivot or existing children
  children=list(turret.children); mats=[(c,c.matrix_world.copy()) for c in children if c != well]
  turret=join([turret,well],'Turret',T)
  for c,wm in mats:c.parent=turret;c.matrix_world=wm
 bits=[cyl((x,y,z+.025),r,.045,'Paint',verts=48),tube([(x-.07,y,z+.064),(x-.07,y+.045,z+.105),(x+.07,y+.045,z+.105),(x+.07,y,z+.064)],.012),cyl((x,y+.9*r,z+.018),.032,r*1.3,'Metal','X')]
 h=join(bits,'Hatch_'+name,(x,y+.9*r,z+.018),parent);hatches.append(h)
 if name=='Commander':
  part('Turret_Cupola',[ring((x,y,z-.015),r+.055,.035),*[bolt((x+(r+.055)*cos(k*pi/8),y+(r+.055)*sin(k*pi/8),z+.012),r=.012) for k in range(16)]],turret)
# IR lamp beside gun, periscopes and antenna.
part('Turret_IRSearchlight',[cyl((.66,-1.2,2.22),.175,.17,'Paint','Y',48),cyl((.66,-1.291,2.22),.147,.012,'Lamps','Y',48),ring((.66,-1.30,2.22),.165,.014,'Metal','Y'),box((.66,-1.15,2.04),(.12,.10,.16))],turret)
for side,x in [('L',.62),('R',-.62)]:
 part('Turret_Sight_'+side,[box((x,-.55,2.34),(.22,.18,.14),'Paint',.025),box((x,-.651,2.35),(.15,.012,.053),'Lamps',.007)],turret)
part('Turret_Antenna',[cyl((-.82,.40,2.18),.065,.10,'Rubber'),tube([(-.82,.40,2.22),(-.82,.40,3.10)],.006,'Metal')],turret)
# DShK receiver, finned barrel, gas tube, spade grips, ammo box, articulated pintle.
mgp=(.50,-.1,2.40)
bits=[cyl(mgp,.037,.22,'Metal'),box((.5,-.22,2.58),(.15,.42,.14),'Metal',.012),cyl((.5,-.74,2.60),.028,.65,'Metal','Y'),cyl((.5,-1.105,2.60),.043,.10,'Metal','Y'),cyl((.5,-.70,2.535),.018,.44,'Metal','Y'),box((.34,-.22,2.54),(.19,.23,.22),'Paint'),tube([(.43,-.06,2.58),(.40,.13,2.61),(.4,.19,2.54)],.015,'Metal'),tube([(.57,-.06,2.58),(.60,.13,2.61),(.6,.19,2.54)],.015,'Metal'),ring((.5,-.92,2.67),.036,.008,'Metal','Y')]
for y in [-.46-i*.028 for i in range(15)]:bits.append(ring((.5,y,2.60),.029,.006,'Metal','Y',24))
mg=join(bits,'MG',mgp,turret)
for name,pos,par in [('Seat_Commander',(.49,-.12,2.45),turret),('Seat_Driver',(.58,-2.14,1.68),None),('Exhaust',(1.64,2.45,1.47),None),('Light_Head_L',(.99,-2.49,1.56),None),('Light_Head_R',(-.99,-2.49,1.56),None),('Fx_Engine',(0,1.6,1.55),None),('Fx_Ammo',(0,0,.85),None),('Fx_Hatch',(.49,-.12,2.42),turret)]:empty(name,pos,par)
# Sort wheel nodes front to rear (idler is foremost, then 5 roadwheels, then sprocket).
for side in ['L','R']:
 ww=sorted([o for o in wheels if o.name.startswith('Wheel_'+side)],key=lambda o:o.location.y)
 for i,o in enumerate(ww):o.name='tmp_'+side+str(i)
 for i,o in enumerate(ww):o.name='Wheel_'+side+str(i+1)
# Spend geometry on silhouettes; simplify hidden bevel transitions on wheel/tread assemblies.
for o in wheels+tracks:
 bpy.context.view_layer.objects.active=o
 mod=o.modifiers.new('Game geometry budget','DECIMATE');mod.ratio=.72 if o in wheels else .80
 bpy.ops.object.modifier_apply(modifier=mod.name)
healthy=list(bpy.context.scene.objects)
# Ensure parent matrices evaluated before geometry copies.
bpy.context.view_layer.update()
   x=-.7+i*.43;y=-2.70+.05*sin(i);z=1.20+(y+3.12)*(.28/.88);c=(x,y,z);normal=(0,-.304,.953)
  elif face=='Rear':
   zz=.72+.10*sin(i);c=(-.72+i*.46,3.1+(zz-.43)/.72*.125,zz);normal=(0,1,-.174)
  else:
   s=1 if face=='L' else -1;c=(s*(1.04+(1.20-.43)/1.05*.33),-1.8+i*1.1,1.20);normal=(s,0,-.314)
  bits+=impact(c,normal,.065 if i else .09,i==0)
 o=join(bits,'Scar_Hull_'+face);parent_world(o,HD);damage.append(o);scar_names.append(o.name)
def turret_surface(point):
 z=point.z-T[2]
 for j in range(len(levels)-1):
  a,rx,ry=levels[j];b,rx2,ry2=levels[j+1]
  if a<=z<=b:
   t=(z-a)/(b-a);rx=rx+(rx2-rx)*t;ry=ry+(ry2-ry)*t
   ang=math.atan2((point.y-T[1]-.075*z)/ry,point.x/rx)
   p=Vector((rx*cos(ang),T[1]+ry*sin(ang)+.075*z,point.z));n=Vector((cos(ang),sin(ang),.4)).normalized();return p,n
 return point,Vector((1,0,0))
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  angle={'Front':-pi/2,'Rear':pi/2,'L':0,'R':pi}[face]+(i-1.5)*.17
  z=1.88+.07*(i%2);rx=1.16 if i%2==0 else 1.13;ry=1.26 if i%2==0 else 1.23
  c=(rx*cos(angle),T[1]+ry*sin(angle)+.075*(z-T[2]),z);normal=(cos(angle),sin(angle),.40)
  bits+=impact(c,normal,.066,i==0,turret_surface)
 o=join(bits,'Scar_Turret_'+face,T);parent_world(o,TD);damage.append(o);scar_names.append(o.name)
broken=[]
for tr in tracks:
 d=copy_obj(tr,tr.name+'_Broken');side=1 if tr.name=='Track_L' else -1
 # Each link is moved rigidly to retain its construction. A loose upper run falls outside the road wheels.
 for v in d.data.vertices:
  co=v.co;p,q=track_samples[track_kd.find((co.y,co.z,0))[1]]
  y,z=p
  if z>.93:
   co.x+=side*.56;co.z-=z-.06;co.y-=.5
  elif y<-2.7:
   t=max(0,min(1,(z-.06)/.9));co.x+=side*.56*t;co.y-=1.2*t;co.z-=max(0,z-.07)*.96
 mod=d.modifiers.new('Broken tread game mesh','DECIMATE');mod.ratio=.65;apply(d)
 parent_world(d,HD);damage.append(d);broken.append(d)
# Destroyed gun uses the actual mantlet and tube, bent at the trunnion with a ripped muzzle.
bits=[copy_obj(gun),copy_obj(barrel)]
rot=Matrix.Translation(Vector(G))@Matrix.Rotation(math.radians(16),4,'X')@Matrix.Translation(-Vector(G))
for o in bits:o.matrix_world=rot@o.matrix_world
bg=join(bits,'Gun_Broken',G)
for v in bg.data.vertices:
 if v.co.y<-2.15:
  v.co.x+=.12*(v.co.y+2.15)**2;v.co.z-=.08*abs(v.co.y+2.15)
parent_world(bg,TD);damage.append(bg)
# Wreck copies originate from the healthy assemblies. Decimation only affects these static wreck meshes.
whbits=[];wtbits=[]
turret_set={turret,gun,barrel,mg,*[o for o in healthy if o.parent in [turret,gun,barrel]]}
for o in healthy:
 if o.type!='MESH' or o in tracks:continue
 ist=o in turret_set
 if o.name.startswith('Part_') and (sum(o.name.encode())%5 in [0,1,2]):continue
 if o.name.startswith('Part_EngineGrille'):continue
 c=copy_obj(o)
 if o.name.startswith('Hatch_'):
  pivot=o.matrix_world.translation;c.matrix_world=Matrix.Translation(pivot)@Matrix.Rotation(math.radians(72),4,'X')@Matrix.Translation(-pivot)@c.matrix_world
 if o in [gun,barrel]:c.matrix_world=rot@c.matrix_world
 if o in wheels:
  c.location.z-=.05
  # Remove tyre geometry entirely: burnt wheel exposes the bare metal flange.
  bm=bmesh.new();bm.from_mesh(c.data);dead=[f for f in bm.faces if c.data.materials[f.material_index].name=='Rubber'];bmesh.ops.delete(bm,geom=dead,context='FACES');bm.to_mesh(c.data);bm.free()
## Multi-Claude coordination (durable)

Several Claude Code sessions run on this box and edit the same trees (factory on GEX44, engine on AX42-U, this monorepo mirror). A filesystem bus at `~/.claude/coord/` prevents collisions. The `coord` CLI (`~/.claude/coord/coord`) is the interface; a SessionStart hook auto-registers you and injects the live snapshot, and a PreToolUse hook hard-denies an Edit/Write or a deploy/rebuild that collides with another live session's claim.

**Protocol — before you WRITE / REBUILD / RESTART a shared resource:**
1. `coord check <host:path>` — is anyone else on it? (exit 3 = conflict)
2. `coord claim <host:path> [--note "..."]` — take it (exclusive; auto-expires, TTL 30m, refreshed by heartbeat).
3. Do the work, then `coord release <host:path>` (or `--all`).
4. `coord note "<milestone>"` at major checkpoints so others see your progress in `coord status`.

**Rules:**
- Reads need NO claim — you only claim what you will mutate.
- Resources are EXACT files (`gex44:apps/x/f.py`) or EXACT dir prefixes (`gex44:apps/x/`). No globs. Hosts: `gex44`, `ax42`, `local`, `prod`, `service` (e.g. `service:forge-corp-factory`).
- The guard fails OPEN — if `coord` errors it never blocks your tools. It only bites on a real, live, conflicting claim.
- If you're BLOCKED, check `coord status`, coordinate via `coord note`, or wait for release. Override only after confirming with the other session.
- Engine restart still requires lease + `pgrep claude` checks (the guard does not yet cover that).

**Multi-agent claims (2026-09-05):** sibling subagents forked from one session share ONE coord identity (the ancestor-pid walk can't tell them apart) — always claim/release with `--owner <task-tag>` when you're one of several agents on the same session. Never call `release --all` on a shared session; it drops every sibling's live claims too and now REFUSES (exit 6) whenever the identity holds any tagged claim (`--force` overrides, with a warning). Forge-agent workers (`forge_agent.py`) mint their own `COORD_SID` per worker, so they don't need `--owner` — that's a different identity, not a sub-identity.

## For non-Claude agents (Codex, Gemini, ...)

This file is a generated rendering of `CLAUDE.md` for harnesses that read
`AGENTS.md` natively instead. It carries the same rules — they apply to you
too. On top of them:

- **Use the `forge` MCP server before acting.** It is mounted in your CLI's
  config (Codex: `[mcp_servers.forge]` in `~/.codex/config.toml`). Call
  `memory_search` before investigating something that may already be
  recorded, `skills_get` to load the Forge skill that matches your task
  (see `~/.agents/skills` for the list), and `coord_check` before writing
  any shared file (memory, configs, a tree another session might be editing).
- **`edit_then_run` (opt-in).** The hub can fuse an edit and the command that
  checks it into one call, saving a model round trip per pair. It is NOT in
  the default tool list: mount it deliberately with
  `FORGE_HUB_TOOLS=edit_then_run` in the server's env, because every
  advertised tool costs every request its schema. Benched 2026-09-22 it cut
  turns (30 -> 26) and RAISED cost (~$0.0105 -> ~$0.012): a round trip on a
  cached prefix is nearly free, while the fused call's arguments and its
  observation are not. Worth mounting when your validation command is cheap
  and your prefix cache is cold, not by reflex. It refuses rather than
  guesses (no match, ambiguous `old_string`, no-op edit), keeps the edit when

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log; pgrep -af \"[b]lender.real.*fal-author/t55-tank-v1\"'; /home/claude-agent/.claude/coord/coord status | tail -8; python3 - <<'PY'
import json
j=json.load(open('nodes.json'))
print(j['bounds'],j['triangles'])
print('twins',sum(bool(x['twin']) for x in j['damage']['parts']))
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 716ms:
1434427 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/.forge-worktrees/1791736017-be5ed7/ [exclusive] by unreal-gpt-6-astra-720574:1728969234 held 981s exp 1779s :: You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ= owner=1791736017-be5ed7
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/creatures-out/ [exclusive] by unreal-gpt-6-astra-720575:1728969234 held 955s exp 1779s :: You are W-CREATURES of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-CREATURES.md and do exactly what they say. First usable versions by 19:20 CET, hard stop 19:50 CET
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/director-out/ [exclusive] by unreal-gpt-6-astra-720574:1728969234 held 954s exp 1779s :: You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ=
  local:/home/claude-agent/forge-hub/agent/forge_agent.py [exclusive] by 1153004:1717757612 held 33s exp 1766s :: Claude Code session
  local:/tmp/churchill-runtime/ [exclusive] by 682570:1728882986 held 409s exp 1390s :: 
=== recent milestones ===
  16:41 local disk 97%: archiving 96 forge-build folders untouched 7+ days to gex44:/srv/archive/local-forge-build-20261011 (forge-build-restore brings back)
  16:41 W-DIRECTOR 18:42 CET: shared town + 12 animated shots saved, two revised 1080p style frames viewed. Full previz rendering. Roof/road mapping corrected; creature stand-ins remain.
{'min': [-1.6349999904632568, 0.0, -3.2360615730285645], 'max': [1.6401904821395874, 3.0999999046325684, 5.77500057220459]} {'healthy': 136260, 'damage': 89105, 'wreck': 36541}
twins 19

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text().replace(\"('F',-3.18,-.05),('R',-.02,3.20)\",\"('F',-2.76,-.05),('R',-.02,2.76)\").replace(\"box((.34,-.22,2.54),(.19,.23,.22),'Paint')\",\"box((.34,-.22,2.54),(.19,.23,.22),'Metal')\")
p.write_text(s)
PY
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 tail -4 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1650ms:
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
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exec
/bin/bash -lc "mkdir -p /tmp/t55-rev1; cp final.png side.png clay.png /tmp/t55-rev1/; df -h . /tmp; ssh gex44 tail -4 /root/fal-author/t55-tank-v1/build.log; sed -n '1,70p' /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 521ms:
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       150G  140G  4.3G  98% /
/dev/sda1       150G  140G  4.3G  98% /
"""Read-only audit of uncompressed GLB triangle meshes; requires numpy.

Report mode exits 0 even with findings. --strict exits 1 for findings.
Invalid or unsupported input exits 2. This is not a complete glTF validator.
"""
import argparse
import hashlib
import json
from pathlib import Path
import struct
import sys

import numpy as np


def audit(path):
    data = Path(path).read_bytes()
    if len(data) < 20 or struct.unpack_from('<4sII', data) != (b'glTF', 2, len(data)):
        raise ValueError('Invalid GLB v2 header/length')
    chunks = {}
    offset = 12
    while offset < len(data):
        if offset + 8 > len(data):
            raise ValueError('Truncated chunk header')
        length, kind = struct.unpack_from('<II', data, offset)
        offset += 8
        if length % 4 or offset + length > len(data) or kind in chunks:
            raise ValueError('Invalid, duplicate or truncated GLB chunk')
        chunks[kind] = data[offset:offset + length]
        offset += length
    g = json.loads(chunks[0x4E4F534A])
    binary = chunks.get(0x004E4942, b'')
    compressed = {'KHR_draco_mesh_compression', 'EXT_meshopt_compression'}
    if compressed.intersection(g.get('extensionsUsed', []) + g.get('extensionsRequired', [])):
        raise ValueError('Compressed geometry: audit the uncompressed export')
    buffers = g.get('buffers', [])
    if len(buffers) != 1 or 'uri' in buffers[0] or buffers[0]['byteLength'] > len(binary):
        raise ValueError('Expected one embedded geometry buffer')
    dtypes = {5120: 'i1', 5121: 'u1', 5122: '<i2', 5123: '<u2', 5125: '<u4', 5126: '<f4'}
    widths = {'SCALAR': 1, 'VEC2': 2, 'VEC3': 3, 'VEC4': 4}

    def accessor(index):
        q = g['accessors'][index]
        if 'sparse' in q or 'bufferView' not in q:
            raise ValueError('Sparse or implicit accessor unsupported')
        v = g['bufferViews'][q['bufferView']]
        if v.get('buffer', 0) != 0 or 'EXT_meshopt_compression' in v.get('extensions', {}):
            raise ValueError('Unsupported buffer view')
        dtype = np.dtype(dtypes[q['componentType']])
        width = widths[q['type']]
        stride = v.get('byteStride', dtype.itemsize * width)
        count = q['count']
        start = q.get('byteOffset', 0)
        end = start + (count - 1) * stride + width * dtype.itemsize if count else start
        base = v.get('byteOffset', 0)
        if count < 0 or start < 0 or base < 0 or stride < dtype.itemsize * width or end > v['byteLength'] or base + v['byteLength'] > buffers[0]['byteLength']:
            raise ValueError('Accessor exceeds declared buffer bounds')
        return np.ndarray((count, width), dtype=dtype, buffer=binary,
                          offset=base + start, strides=(stride, dtype.itemsize))

    rows = []
    for mi, mesh in enumerate(g.get('meshes', [])):
        for pi, primitive in enumerate(mesh['primitives']):
            if primitive.get('mode', 4) != 4 or primitive.get('targets') or 'KHR_draco_mesh_compression' in primitive.get('extensions', {}):
                raise ValueError('Only uncompressed TRIANGLES without morph targets supported')
            attrs = {name: accessor(i) for name, i in primitive['attributes'].items()}
            pos = attrs['POSITION']
            if pos.shape[1] != 3 or g['accessors'][primitive['attributes']['POSITION']].get('normalized'):
                raise ValueError('Expected non-normalized VEC3 positions')
            idx = np.arange(len(pos))

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text()
s=s.replace(\"if random.random()<.14:\",\"if (poly.center.y>0 and poly.center.x<.15) or random.random()<.035:\")
needle=\"  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name\"
insert=\"\"\"  if not p.name.startswith('Part_Turret') and any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum']):
   # Ragged through-tear cut into the actual replaceable panel, not a painted decal.
   pc=d.matrix_world.translation;cv=[]
   for zz in [-.65,.65]:
    for k in range(10):
     aa=k*2*pi/10;rr=.105*(1+.24*sin(k*13.3));cv.append((pc.x+.06+rr*cos(aa),pc.y+.12+rr*1.6*sin(aa),pc.z+zz))
   cf=[tuple(range(9,-1,-1)),tuple(range(10,20))]+[(k,(k+1)%10,(k+1)%10+10,k+10) for k in range(10)]
   cut=mesh('ragged tear tool',cv,cf,'Burnt');apply(cut)
   bpy.context.view_layer.objects.active=d;mod=d.modifiers.new('Torn equipment shell','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cut
   bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name\"\"\"
s=s.replace(needle,insert);p.write_text(s)
PY
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1543ms:
codex
The revised script is waiting in the shared GPU queue. It includes broader cast wheel faces, tighter track wrap, folded canvas, curved mudguards and stronger baked weathering. Damaged equipment also has torn openings now, beyond the bent shapes and scorch marks.

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/bin/bash -lc "python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py t55-tank.glb > /tmp/t55-audit1.json; tail -12 /tmp/t55-audit1.json; ssh gex44 'date -u +%H:%M:%S; tail -5 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 749ms:
      "same_as": "Cylinder.106[2]"
    }
  ],
  "note": "Mesh-local counts, before node transforms/instances. Degenerate threshold: cross-product magnitude < 1e-12 in asset units squared. Not a source-topology or visual-quality verdict.",
  "triangles": 136260,
  "zero_area_triangles": 1968,
  "nonfinite_attribute_components": 0,
  "findings": [
    "zero_area_triangles",
    "duplicate_primitives"
  ]
}
16:44:41

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/bin/bash -lc "python3 - <<'PY'
import json
j=json.load(open('/tmp/t55-audit1.json'));print(j.keys())
for r in j.get('primitives',[]):
 if r.get('zero_area_triangles',0)>0:print({k:v for k,v in r.items() if not isinstance(v,(list,dict))})
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
dict_keys(['file', 'sha256', 'bytes', 'primitive_count', 'material_count', 'embedded_images', 'external_uris', 'primitives', 'duplicate_primitives', 'note', 'triangles', 'zero_area_triangles', 'nonfinite_attribute_components', 'findings'])
{'mesh': 'formed tube.040', 'primitive': 1, 'triangles': 56, 'zero_area_triangles': 16, 'nonfinite_attribute_components': 0}
{'mesh': 'Cube.1028', 'primitive': 1, 'triangles': 44, 'zero_area_triangles': 16, 'nonfinite_attribute_components': 0}
{'mesh': 'Cube.1030', 'primitive': 1, 'triangles': 44, 'zero_area_triangles': 16, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.030', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.044', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.058', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.072', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.086', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.106', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.120', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.134', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.148', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}
{'mesh': 'Cylinder.162', 'primitive': 2, 'triangles': 600, 'zero_area_triangles': 192, 'nonfinite_attribute_components': 0}

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text();needle=\"def export(objects,path):\";idx=s.index(needle);print(s[idx:idx+220])
PY
ssh gex44 tail -4 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 797ms:
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
ValueError: substring not found

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/bin/bash -lc "rg -n '"'^def export'"' build_t55-tank.py; ssh gex44 \"ps -eo pid,etime,args | rg 'blender.real|gpu_gate.py' | tail -8\"" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 518ms:
392:def export(objs,path):
bash: line 1: rg: command not found

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text().replace(\"def export(objs,path):\\n\", \"\"\"def export(objs,path):
 # Remove collapsed bevel triangles without changing any articulated object transform.
 for ob in objs:
  if ob.type"'!='"'MESH':continue
  bm=bmesh.new();bm.from_mesh(ob.data);bmesh.ops.triangulate(bm,faces=list(bm.faces))
  dead=[f for f in bm.faces if f.calc_area()<1e-12]
  if dead:bmesh.ops.delete(bm,geom=dead,context='FACES')
  bm.to_mesh(ob.data);bm.free();ob.data.update()
\"\"\")
s=s.replace(\"w.rotation_euler=(.30,2.50,.4)\",\"w.rotation_euler=(.30,2.50,.4);bpy.context.view_layer.update();w.location.z-=min((w.matrix_world@Vector(c)).z for c in w.bound_box)\")
p.write_text(s)
PY
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E \"blender.real|gpu_gate.py\" | tail -8'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1642ms:
1432700       03:17 python3 /opt/gpu-gate/gpu_gate.py --name blender-ruth --need-mib 5000 --priority build --poll 2 --max-concurrent 3 --timeout 1200 -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/render_director.py -- previz 501 900
1434427       02:56 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1439944       01:57 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/render_director.py -- previz 501 900
1445534       00:52 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/a7v-tank-v1/build_a7v-tank.py
1445538       00:52 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/a7v-tank-v1/build_a7v-tank.py
1447281       00:31 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/char-b1-tank-v1/build_char-b1-tank.py
1450862       00:00 bash -c tail -4 /root/fal-author/t55-tank-v1/build.log; ps -eo pid,etime,args | grep -E "blender.real|gpu_gate.py" | tail -8
1450865       00:00 grep -E blender.real|gpu_gate.py

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/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log; date -u +%H:%M:%S'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 485ms:
16:45:56

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/bin/bash -lc "cat > /tmp/t55-contract.py <<'PY'
import json,struct,sys,numpy as np
from pathlib import Path
root=Path(sys.argv[1]);meta=json.loads((root/'nodes.json').read_text())
def read(n):
 d=(root/n).read_bytes();sz=struct.unpack_from('<I',d,12)[0];return json.loads(d[20:20+sz])
a=read('t55-tank.glb');b=read('t55-tank-damage.glb')
def maps(g):
 nodes={n['name']:n for n in g['nodes']};parent={g['nodes'][c]['name']:n['name'] for n in g['nodes'] for c in n.get('children',[])};return nodes,parent
A,ap=maps(a);B,bp=maps(b)
assert ap['Gun']=='Turret' and ap['Barrel']=='Gun' and ap['Muzzle']=='Barrel' and ap['MG']=='Turret'
for n in ['Seat_Commander','Seat_Driver','Exhaust','Light_Head_L','Light_Head_R','Fx_Engine','Fx_Ammo','Fx_Hatch','Muzzle']:assert 'mesh' not in A[n]
assert {b['nodes'][i]['name'] for i in b['scenes'][0]['nodes']}=={'Hull_Damage','Turret_Damage','Wreck_Hull','Wreck_Turret'}
assert len([n for n in A if n.startswith('Part_')])>=14
assert len(meta['damage']['scars'])==8
for p in meta['damage']['parts']:
 if p['twin']:assert p['part'] in A and p['twin'] in B
for g in [a,b]:
 assert not g.get('cameras') and not g.get('animations')
 for m in g['materials']:
  if m['name']=='Paint':assert m['pbrMetallicRoughness']['baseColorFactor']==[.11,.14,.08,1]
for side in ['L','R']:
 ws=[n for n in meta['nodes'] if n['name'].startswith('Wheel_'+side)];ws.sort(key=lambda n:int(n['name'].split(side)[-1]));assert len(ws)==7
 assert all(ws[i]['world_position'][2]>ws[i+1]['world_position'][2] for i in range(6))
assert meta['triangles']['healthy']<=140000 and meta['triangles']['damage']<=110000
assert (root/'t55-tank.glb').stat().st_size<=12000000
print('PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets')
print('Bounds',meta['bounds'],'counts',meta['triangles'])
PY
python3 /tmp/t55-contract.py .
ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 735ms:
PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets
Bounds {'min': [-1.6349999904632568, 0.0, -3.2360615730285645], 'max': [1.6401904821395874, 3.0999999046325684, 5.77500057220459]} counts {'healthy': 136260, 'damage': 89105, 'wreck': 36541}

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/bin/bash -lc "ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log; python3 - <<'PY'
import json
j=json.load(open('nodes.json'))
for n in j['nodes']:
 if n['name'] in ['Turret','Gun','Barrel','MG','Muzzle'] or n['name'].startswith('Hatch'):print(n)
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 503ms:
{'name': 'Turret', 'world_position': [0.0, 1.51, 0.28], 'parent': None}
{'name': 'Gun', 'world_position': [0.0, 1.94, 1.44], 'parent': 'Turret'}
{'name': 'Barrel', 'world_position': [0.0, 1.94, 1.72], 'parent': 'Gun'}
{'name': 'Muzzle', 'world_position': [0.0, 0.0, -0.0], 'parent': 'Barrel'}
{'name': 'Hatch_Commander', 'world_position': [0.49, 2.368, -0.1455], 'parent': 'Turret'}
{'name': 'Hatch_Loader', 'world_position': [-0.47, 2.348, -0.211], 'parent': 'Turret'}
{'name': 'Hatch_Driver', 'world_position': [0.58, 1.498, 1.9195], 'parent': None}
{'name': 'MG', 'world_position': [0.5, 2.4, 0.1], 'parent': 'Turret'}

codex
The exported graph passes the basic contract checks: separate moving nodes, seven wheel assemblies per side, 27 removable parts, 19 damage twins and four damage roots. A position check caught an uninitialized transform on parented effect sockets, including the muzzle; I’m fixing that before the next export.

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text();old=\"o=bpy.data.objects.new(name,None);bpy.context.collection.objects.link(o);o.location=pos\\n if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm\";new=\"o=bpy.data.objects.new(name,None);bpy.context.collection.objects.link(o);o.matrix_world=Matrix.Translation(Vector(pos))\\n if parent:o.parent=parent;o.matrix_world=Matrix.Translation(Vector(pos))\";assert old in s;s=s.replace(old,new);p.write_text(s)
PY
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1664ms:
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/bin/bash -lc "python3 - <<'PY'
import json
j=json.load(open('nodes.json'));a={n['name']:n['world_position'] for n in j['nodes']};b={n['name']:n['world_position'] for n in j['damage_nodes']}
for p in j['damage']['parts']:
 if p['twin'] and a[p['part']]"'!=b[p['"'twin']]:print('mismatch',p,a[p['part']],b[p['twin']])
for x in ['Turret_Damage','Wreck_Turret','Gun_Broken']:print(x,b[x])
PY
ssh gex44 'date -u +%H:%M:%S; tail -3 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 566ms:
mismatch {'part': 'Part_Turret_Cupola', 'twin': 'Dmg_Turret_Cupola'} [0.49, 2.33684, 0.12] [0.49, 3.84684, 0.4]
mismatch {'part': 'Part_Turret_IRSearchlight', 'twin': 'Dmg_Turret_IRSearchlight'} [0.66, 2.1795, 1.20606] [0.66, 3.6895, 1.48606]
mismatch {'part': 'Part_Turret_Sight_L', 'twin': 'Dmg_Turret_Sight_L'} [0.62, 2.34, 0.5585] [0.62, 3.85, 0.8385]
mismatch {'part': 'Part_Turret_Sight_R', 'twin': 'Dmg_Turret_Sight_R'} [-0.62, 2.34, 0.5585] [-0.62, 3.85, 0.8385]
Turret_Damage [0.0, 1.51, 0.28]
Wreck_Turret [0.0, 1.51, 0.28]
Gun_Broken [0.0, 1.94, 1.44]
16:47:22

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text().replace(\"def parent_world(o,p):\\n wm=o.matrix_world.copy();o.parent=p;o.matrix_world=wm\", \"def parent_world(o,p):\\n bpy.context.view_layer.update();wm=o.matrix_world.copy();o.parent=p;o.matrix_world=wm;bpy.context.view_layer.update()\")
s=s.replace(\" mod=d.modifiers.new('Broken tread game mesh'\", \" low=min(v.co.z for v in d.data.vertices)\\n for v in d.data.vertices:v.co.z-=low\\n mod=d.modifiers.new('Broken tread game mesh'\")
s=s.replace(\"(ROOT/'nodes.json').write_text(json.dumps(meta,indent=2))\", \"\"\"healthy_positions={n['name']:Vector(n['world_position']) for n in meta['nodes']}
damage_positions={n['name']:Vector(n['world_position']) for n in meta['damage_nodes']}
for pp in meta['damage']['parts']:
 if pp['twin']:assert (healthy_positions[pp['part']]-damage_positions[pp['twin']]).length<.0001,pp
assert (healthy_positions['Muzzle']-Vector((0,1.94,5.775))).length<.0001
(ROOT/'nodes.json').write_text(json.dumps(meta,indent=2))\"\"\")
p.write_text(s)
PY
python3 -m py_compile build_t55-tank.py
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 tail -3 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 1752ms:
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exec
/bin/bash -lc "ssh gex44 'tail -5 /root/fal-author/t55-tank-v1/build.log; date -u +%H:%M:%S'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 509ms:
INFO gpu_gate: gpu slot acquired by blender (pid 1434427, 6000 MiB, batch)
00:00.425  cycles           | WARNING HIPEW initialization failed: Error opening HIP dynamic library
/root/fal-author/t55-tank-v1/build_t55-tank.py:37: DeprecationWarning: 'Material.use_nodes' is expected to be removed in Blender 6.0
  m=bpy.data.materials.new(name+'_source');m.use_nodes=True
16:48:03

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/bin/bash -lc "ssh gex44 'tail -6 /root/fal-author/t55-tank-v1/build.log; date -u +%H:%M:%S'; python3 - <<'PY'
from pathlib import Path
p=Path('/tmp/t55-contract.py');s=p.read_text().replace(\"for p in meta['damage']['parts']:\",\"aa={n['name']:np.array(n['world_position']) for n in meta['nodes']};bb={n['name']:np.array(n['world_position']) for n in meta['damage_nodes']}\\nassert np.linalg.norm(aa['Muzzle']-[0,1.94,5.775])<.001\\nfor p in meta['damage']['parts']:\").replace(\"if p['twin']:assert p['part'] in A and p['twin'] in B\",\"if p['twin']:\\n  assert p['part'] in A and p['twin'] in B\\n  assert np.linalg.norm(aa[p['part']]-bb[p['twin']])<.001\")
p.write_text(s)
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 600ms:
Info: Baking map saved to internal image, save it externally or pack it
BAKED Burnt
Info: Baking map saved to internal image, save it externally or pack it
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BAKED Scars
16:48:34

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/bin/bash -lc "ssh gex44 'tail -7 /root/fal-author/t55-tank-v1/build.log; date -u +%H:%M:%S'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 545ms:
Info: Baking map saved to internal image, save it externally or pack it
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BAKED Burnt
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BAKED Scars
16:48:54

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codex
The new geometry and material build is running. I found another issue in the motion test: imported glTF nodes use quaternion rotations, so changing Euler angles had not exercised the joints. I’ll correct the test and rerun it, including hatch opening direction.

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text().replace(\"math.radians(72),4,'X'\",\"math.radians(-72),4,'X'\")
s=s.replace(\"for o in moving:\\n if o.name=='Barrel'\", \"for o in moving:\\n o.rotation_mode='XYZ'\\n if o.name=='Barrel'\")
s=s.replace(\"else:o.rotation_euler[2 if o.name in ['Turret','MG'] else 0]+=pi/6\", \"else:o.rotation_euler[2 if o.name in ['Turret','MG'] else 0]+=(-pi/6 if o.name.startswith('Hatch_') or o.name=='Gun' else pi/6)\")
s=s.replace(\"w=Dn['Wreck_Turret'];wm=w.matrix_world.copy();w.location=\", \"w=Dn['Wreck_Turret'];wm=w.matrix_world.copy();w.rotation_mode='XYZ';w.location=\")
p.write_text(s)
PY
ssh gex44 'tail -10 /root/fal-author/t55-tank-v1/build.log; date -u +%H:%M:%S'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 598ms:
18:49:15 | INFO: Blender create Mesh node impact.028
18:49:15 | INFO: Blender create Mesh node armoured monocoque.001
18:49:15 | INFO: Blender create Mesh node cast turret.001
18:49:15 | INFO: glTF import finished in 0.53s
/root/fal-author/t55-tank-v1/build_t55-tank.py:591: DeprecationWarning: 'World.use_nodes' is expected to be removed in Blender 6.0
  world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.62,.70,.80,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
01:22.513  render           | Saved: '/root/fal-author/t55-tank-v1/final.png'
01:32.282  render           | Saved: '/root/fal-author/t55-tank-v1/side.png'
/root/fal-author/t55-tank-v1/build_t55-tank.py:606: DeprecationWarning: 'Material.use_nodes' is expected to be removed in Blender 6.0
  clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
16:49:35

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exec
/bin/bash -lc 'mkdir -p /tmp/t55-rev2; scp gex44:/root/fal-author/t55-tank-v1/{final.png,side.png,nodes.json} /tmp/t55-rev2/' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 3394ms:
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/bin/bash -lc 'cat /tmp/t55-rev2/nodes.json | tail -6; ssh gex44 tail -6 /root/fal-author/t55-tank-v1/build.log' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 508ms:
    "wreck": [
      "Wreck_Hull",
      "Wreck_Turret"
    ]
  }
}  clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
01:44.285  render           | Saved: '/root/fal-author/t55-tank-v1/clay.png'
01:47.648  render           | Saved: '/root/fal-author/t55-tank-v1/pivots.png'
01:49.166  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_0.png'
01:50.798  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_1.png'
01:52.140  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_2.png'

 succeeded in 452814ms:
/bin/bash: line 63: python: command not found
/bin/bash: line 64: python: command not found

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exec
/bin/bash -lc "python3 - <<'PY'
import json
j=json.load(open('/tmp/t55-rev2/nodes.json'));print(j['triangles']);print([n for n in j['nodes'] if n['name']=='Muzzle'])
PY
ssh gex44 tail -5 /root/fal-author/t55-tank-v1/build.log" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 578ms:
{'healthy': 144860, 'damage': 93409, 'wreck': 39893}
[{'name': 'Muzzle', 'world_position': [0.0, 1.94, 5.775], 'parent': 'Barrel'}]
02:02.883  render           | Saved: '/root/fal-author/t55-tank-v1/_state_4.png'
02:03.960  render           | Saved: '/root/fal-author/t55-tank-v1/_state_5.png'
DONE {"healthy": 144860, "damage": 93409, "wreck": 39893}

Blender quit

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/bin/bash -lc 'scp gex44:/root/fal-author/t55-tank-v1/{states.png,paints.png,pivots.png,t55-tank.glb,t55-tank-damage.glb,NOTES.md} /tmp/t55-rev2/' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 8318ms:
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context compacted
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/bin/bash -lc "rg -n 'recipes|weather|streak|spoke|petal|Broken|ragged|decimate|levels|tow|Burnt|pivots|rotate' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
35:recipes=[('Paint','green_metal_rust',(.87,.87,.87),.12,.78),('Rubber','rubberized_track',(.025,.027,.025),.0,.9),('TrackSteel','rusty_metal',(.12,.105,.085),.65,.79),('Metal','rusty_metal',(.032,.035,.03),.68,.69),('Canvas','rubberized_track',(.19,.15,.10),0,.95),('Wood','bark_brown_02',(.24,.16,.09),0,.88),('Lamps','green_metal_rust',(.16,.19,.16),.3,.24),('Interior','rusty_metal',(.012,.015,.013),0,.98),('Burnt','rusty_metal',(.075,.065,.055),.35,.94),('Scars','rusty_metal',(.19,.18,.16),.7,.65)]
36:for name,id,col,metal,rough in recipes:
49: # Broad worn patches and rain streaks are baked into the reusable neutral paint tile.
52: weather=node(m,'ShaderNodeMixRGB');weather.blend_type='MULTIPLY';weather.inputs[0].default_value=.72;link(m,mix,'Color',weather,1);link(m,dirt,'Color',weather,2)
54: streak=node(m,'ShaderNodeTexNoise');streak.inputs['Scale'].default_value=1;streak.inputs['Detail'].default_value=3;link(m,mapping,'Vector',streak,'Vector')
55: sr=node(m,'ShaderNodeValToRGB');link(m,streak,'Fac',sr,'Fac');sr.color_ramp.elements[0].position=.32;sr.color_ramp.elements[0].color=(.15,.15,.15,1);sr.color_ramp.elements[1].position=.48
56: finalmix=node(m,'ShaderNodeMixRGB');finalmix.blend_type='MULTIPLY';finalmix.inputs[0].default_value=.42 if name=='Paint' else .2;link(m,weather,'Color',finalmix,1);link(m,sr,'Color',finalmix,2)
169:# Weld seams, towing lugs, final-drive housings, suspension arms.
186:levels=[(0,1.13,1.24),(.06,1.20,1.32),(.18,1.205,1.31),(.39,1.14,1.24),(.61,1.01,1.10),(.77,.80,.85),(.86,.49,.56),(.885,.08,.12)]
187:for j,(z,rx,ry) in enumerate(levels):
190:for j in range(len(levels)-1):
192:f += [tuple(range(63,-1,-1)),tuple((len(levels)-1)*64+k for k in range(64))]
222:  # Five broad dished cast spokes, a starfish casting rather than flat wagon spokes.
303: # brackets remain behind removed stowage.
307:  part(('FuelCell_R' if s==-1 else 'Stowage_L')+str(round((y+2)*10)),bs)
416: if any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum','EngineGrille','ExhaustShroud','Turret_IR','Turret_Sight','Turret_Cupola']):
429:    if M['Burnt'].name not in [m.name for m in d.data.materials]:d.data.materials.append(M['Burnt'])
431:  if not p.name.startswith('Part_Turret') and any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum']):
438:   cut=mesh('ragged tear tool',cv,cf,'Burnt');apply(cut)
442:# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
457: o=mesh('impact',v,f,'Scars');o.data.materials.append(M['Burnt'])
476: for j in range(len(levels)-1):
477:  a,rx,ry=levels[j];b,rx2,ry2=levels[j+1]
493: d=copy_obj(tr,tr.name+'_Broken');side=1 if tr.name=='Track_L' else -1
504: mod=d.modifiers.new('Broken tread game mesh','DECIMATE');mod.ratio=.65;apply(d)
510:bg=join(bits,'Gun_Broken',G)
532: c.data.materials.clear();c.data.materials.append(M['Burnt'])
536: c=copy_obj(tr);c.data.materials.clear();c.data.materials.append(M['Burnt']);
541: o=box((s*.45,1.65,1.64),(.88,.95,.045),'Burnt',.018);o.rotation_euler[1]=s*.4;whbits.append(o)
542:whbits.append(cyl((0,-.28,1.13),.96,.09,'Burnt',verts=64))
549:wtbits += [cyl((0,-.28,1.475),1.05,.085,'Burnt',verts=64),cyl((0,-.28,1.27),.62,.37,'Burnt',verts=48),ring((0,-.28,1.09),.61,.045,'Burnt')]
555:allowed={'Paint','Burnt','Scars','TrackSteel','Rubber'}
559:   if m.name not in allowed:o.data.materials[i]=M['Burnt']
570:meta={'units':'metres','axes':{'up':'+Y','forward':'+Z','left':'+X'},'contract':'tank-damage/v1','bounds':bb,'nodes':node_manifest(healthy),'damage_nodes':node_manifest(damage),'paints':[{'name':n,'linear_rgb':c} for n,c in PAINTS],'triangles':{'healthy':tri_count(healthy),'damage':tri_count(damage),'wreck':tri_count([wh,wt])},'damage':{'parts':[{'part':p.name,'twin':twins.get(p.name)} for p in parts],'scars':scar_names,'broken':{'Track_L':'Track_L_Broken','Track_R':'Track_R_Broken','Gun':'Gun_Broken'},'wreck':['Wreck_Hull','Wreck_Turret']}}
615:render('pivots.png',1280,720,16)
660:  An['Track_L'].hide_render=True;show('Track_L_Broken');An['Gun'].hide_render=True;An['Barrel'].hide_render=True;show('Gun_Broken')
674:'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.',

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/bin/bash -lc "sed -n '35,80p;165,240p;385,445p;487,507p;585,620p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
recipes=[('Paint','green_metal_rust',(.87,.87,.87),.12,.78),('Rubber','rubberized_track',(.025,.027,.025),.0,.9),('TrackSteel','rusty_metal',(.12,.105,.085),.65,.79),('Metal','rusty_metal',(.032,.035,.03),.68,.69),('Canvas','rubberized_track',(.19,.15,.10),0,.95),('Wood','bark_brown_02',(.24,.16,.09),0,.88),('Lamps','green_metal_rust',(.16,.19,.16),.3,.24),('Interior','rusty_metal',(.012,.015,.013),0,.98),('Burnt','rusty_metal',(.075,.065,.055),.35,.94),('Scars','rusty_metal',(.19,.18,.16),.7,.65)]
for name,id,col,metal,rough in recipes:
 m=bpy.data.materials.new(name+'_source');m.use_nodes=True
 nt=m.node_tree;nt.nodes.clear();out=node(m,'ShaderNodeOutputMaterial'); bs=node(m,'ShaderNodeBsdfPrincipled');link(m,bs,'BSDF',out,'Surface')
 diff=image_node(m,download(id,'diff'));bw=node(m,'ShaderNodeRGBToBW');link(m,diff,'Color',bw,'Color')
 ramp=node(m,'ShaderNodeValToRGB');link(m,bw,'Val',ramp,'Fac')
 ramp.color_ramp.elements[0].position=.12;ramp.color_ramp.elements[1].position=.38
 if name=='Paint':
  ramp.color_ramp.elements[0].color=(.12,.12,.12,1);ramp.color_ramp.elements[1].color=(.91,.91,.91,1)
 else:
  ramp.color_ramp.elements[0].color=tuple(c*.35 for c in col)+(1,);ramp.color_ramp.elements[1].color=tuple(min(1,c*1.65) for c in col)+(1,)
 arm=image_node(m,download(id,'arm'),True);arm_sep=node(m,'ShaderNodeSeparateColor');link(m,arm,'Color',arm_sep,'Color')
 noise=node(m,'ShaderNodeTexNoise');noise.inputs['Scale'].default_value=145;noise.inputs['Detail'].default_value=3
 mix=node(m,'ShaderNodeMixRGB');mix.blend_type='MULTIPLY';mix.inputs[0].default_value=.18;link(m,ramp,'Color',mix,1);link(m,noise,'Fac',mix,2)
 # Broad worn patches and rain streaks are baked into the reusable neutral paint tile.
 grain=node(m,'ShaderNodeTexNoise');grain.inputs['Scale'].default_value=9;grain.inputs['Detail'].default_value=5;grain.inputs['Roughness'].default_value=.78
 dirt=node(m,'ShaderNodeValToRGB');link(m,grain,'Fac',dirt,'Fac');dirt.color_ramp.elements[0].position=.30;dirt.color_ramp.elements[0].color=(.09,.09,.09,1);dirt.color_ramp.elements[1].position=.64;dirt.color_ramp.elements[1].color=(1,1,1,1)
 weather=node(m,'ShaderNodeMixRGB');weather.blend_type='MULTIPLY';weather.inputs[0].default_value=.72;link(m,mix,'Color',weather,1);link(m,dirt,'Color',weather,2)
 tc=node(m,'ShaderNodeTexCoord');mapping=node(m,'ShaderNodeVectorMath');mapping.operation='MULTIPLY';mapping.inputs[1].default_value=(55,3,1);link(m,tc,'UV',mapping,0)
 streak=node(m,'ShaderNodeTexNoise');streak.inputs['Scale'].default_value=1;streak.inputs['Detail'].default_value=3;link(m,mapping,'Vector',streak,'Vector')
 sr=node(m,'ShaderNodeValToRGB');link(m,streak,'Fac',sr,'Fac');sr.color_ramp.elements[0].position=.32;sr.color_ramp.elements[0].color=(.15,.15,.15,1);sr.color_ramp.elements[1].position=.48
 finalmix=node(m,'ShaderNodeMixRGB');finalmix.blend_type='MULTIPLY';finalmix.inputs[0].default_value=.42 if name=='Paint' else .2;link(m,weather,'Color',finalmix,1);link(m,sr,'Color',finalmix,2)
 link(m,finalmix,'Color',bs,'Base Color');bs.inputs['Metallic'].default_value=metal;bs.inputs['Roughness'].default_value=rough
 norm=image_node(m,download(id,'nor_gl'),True);nn=node(m,'ShaderNodeNormalMap');nn.inputs['Strength'].default_value=.75;link(m,norm,'Color',nn,'Color')
 bump=node(m,'ShaderNodeBump');bump.inputs['Strength'].default_value=.45;bump.inputs['Distance'].default_value=.004;link(m,noise,'Fac',bump,'Height');link(m,nn,'Normal',bump,'Normal');link(m,bump,'Normal',bs,'Normal')
 bpy.ops.mesh.primitive_plane_add(size=2);p=bpy.context.object;p.data.materials.append(m)
 maps={}
 for mode,size in [('Base',1024 if name=='Paint' else 512),('Normal',512),('ORM',512)]:
  im=bpy.data.images.new(name+'_'+mode,width=size,height=size,alpha=False);im.filepath_raw=str(texdir/(name+'_'+mode+'.png'));im.file_format='PNG'
  if mode!='Base':im.colorspace_settings.name='Non-Color'
  target=node(m,'ShaderNodeTexImage');target.image=im;nt.nodes.active=target
  S.cycles.samples=8
  if mode=='Normal':
   link(m,bs,'BSDF',out,'Surface');bpy.ops.object.bake(type='NORMAL',margin=8)
  else:
   em=node(m,'ShaderNodeEmission')
   if mode=='Base':link(m,finalmix,'Color',em,'Color')
   else:
    comb=node(m,'ShaderNodeCombineColor');comb.inputs[0].default_value=1;comb.inputs[1].default_value=rough;comb.inputs[2].default_value=metal
    rr=node(m,'ShaderNodeMapRange');rr.inputs['From Min'].default_value=0;rr.inputs['From Max'].default_value=1;rr.inputs['To Min'].default_value=max(.1,rough-.18);rr.inputs['To Max'].default_value=min(1,rough+.08);link(m,arm_sep,'Green',rr,'Value');link(m,rr,'Result',comb,1)
    aa=node(m,'ShaderNodeMapRange');aa.inputs['To Min'].default_value=.72;aa.inputs['To Max'].default_value=1;link(m,arm_sep,'Red',aa,'Value');link(m,aa,'Result',comb,0);link(m,comb,'Color',em,'Color')
   link(m,em,'Emission',out,'Surface');bpy.ops.object.bake(type='EMIT',margin=8)
  im.save();maps[mode]=im
 bpy.data.objects.remove(p,do_unlink=True);bpy.data.materials.remove(m)
 m=bpy.data.materials.new(name);m.use_nodes=True;bs=m.node_tree.nodes.get('Principled BSDF')
 n=node(m,'ShaderNodeTexImage');n.image=maps['Base'];link(m,n,'Color',bs,'Base Color')
profile=[(-3.225,.65,1.10),(-3.12,1.20,1.35),(-2.24,1.48,1.37),(2.75,1.48,1.37),(3.225,1.15,1.15),(3.1,.43,1.04),(-2.82,.43,1.04)]
vs=[(s*w,y,z) for s in [-1,1] for y,z,w in profile];N=len(profile)
fs=[tuple(range(N-1,-1,-1)),tuple(range(N,2*N))]+[(i,(i+1)%N,(i+1)%N+N,i+N) for i in range(N)]
hullbits=[bevel(mesh('armoured monocoque',vs,fs),.022),cyl((0,-.3,1.485),1.025,.075,'Metal',verts=64)]
# Weld seams, towing lugs, final-drive housings, suspension arms.
for s in [-1,1]:
 hullbits+=[tube([(s*1.31,-2.34,1.475),(s*1.31,2.7,1.475)],.009,'Metal')]
 for y in [-2.05,-.79,.2,1.19,2.18]:
  hullbits+=[cyl((s*1.075,y,.69),.13,.23,'Metal','X'),tube([(s*1.13,y+.16,.81),(s*1.25,y,.61)],.065,'Metal')]
 for y in [-2.98,2.97]:
  hullbits+=[ring((s*.8,y,.91),.072,.024,'Metal','Y'),box((s*.8,y,.9),(.16,.07,.2))]
 for y in [-2.4,-1.3,0,1.3,2.5]:
  hullbits+=[box((s*1.34,y,1.4),(.12,.17,.12)),bolt((s*1.415,y,1.42),'X')]
# Front spare mounting bosses and driving lamps.
for x in [-.95,.95]:
 for y,z in [(-2.88,1.285),(-2.45,1.44)]:hullbits.append(bolt((x,y,z)))
for x in [-.99,.99]:
 hullbits += [cyl((x,-2.40,1.56),.095,.15,'Metal','Y'),cyl((x,-2.485,1.56),.076,.008,'Lamps','Y')]
hull=join(hullbits,'Hull')
# Cast dome: elliptical rings with asymmetric fore-aft radii, thick closed base.
T=(0,-.28,1.51);v=[];f=[]
levels=[(0,1.13,1.24),(.06,1.20,1.32),(.18,1.205,1.31),(.39,1.14,1.24),(.61,1.01,1.10),(.77,.80,.85),(.86,.49,.56),(.885,.08,.12)]
for j,(z,rx,ry) in enumerate(levels):
 for k in range(64):
  a=2*pi*k/64;v.append((rx*cos(a),T[1]+ry*sin(a)+.075*z,T[2]+z))
for j in range(len(levels)-1):
 for k in range(64):a=j*64+k;b=j*64+(k+1)%64;f.append((a,b,b+64,a+64))
f += [tuple(range(63,-1,-1)),tuple((len(levels)-1)*64+k for k in range(64))]
tbits=[mesh('cast turret',v,f,smooth=True),ring((0,-.28,1.53),1.10,.028,'Metal',seg=64)]
# Cast seam, welded grab rails, lifting eyes.
for s in [-1,1]:
 tbits += [tube([(s*1.07,-.88,1.96),(s*1.18,-.60,1.91),(s*1.21,-.1,1.90),(s*1.18,.12,1.94)],.018),tube([(s*1.1,.3,1.91),(s*1.08,.58,1.94),(s*.87,.83,2.00)],.018)]
 for y in [-.8,.62]:tbits += [ring((s*.84,y,2.11),.046,.015,'Metal','X')]
turret=join(tbits,'Turret',T)
G=(0,-1.44,1.94)
mantle=[uvball((0,-1.42,1.95),(.34,.20,.27),'Canvas',40,20),cyl((0,-1.62,1.94),.205,.18,'Canvas','Y'),ring((0,-1.721,1.94),.16,.014,'Canvas','Y')]
for k in range(14):
 a=2*pi*k/14
 mantle.append(tube([(.29*cos(a),-1.48,1.95+.24*sin(a)),(.24*cos(a),-1.59-.02*sin(a*3),1.95+.20*sin(a)),(.17*cos(a),-1.71,1.94+.17*sin(a))],.009,'Canvas'))
gun=join(mantle,'Gun',G,turret)
# Hollow open-bore barrel as revolved profile; bore cavity continues 0.5m deep.
B=(0,-1.72,1.94)
barprof=[(-1.72,.118),(-1.92,.114),(-4.86,.070),(-4.89,.099),(-5.39,.099),(-5.43,.073),(-5.73,.073),(-5.775,.071),(-5.775,.050),(-5.25,.050)]
v=[];f=[]
for y,r in barprof:
 for k in range(48):a=2*pi*k/48;v.append((r*cos(a),y,1.94+r*sin(a)))
for j in range(len(barprof)-1):
 for k in range(48):a=j*48+k;b=j*48+(k+1)%48;f.append((a,b,b+48,a+48))
barrel=join([mesh('barrel turned steel',v,f,smooth=True),ring((0,-5.41,1.94),.098,.008,'Metal','Y'),ring((0,-4.88,1.94),.099,.006,'Metal','Y')],'Barrel',B,gun)
empty('Muzzle',(0,-5.775,1.94),barrel)
# Wheels: rubber tyres, dished hub, ten recessed windows separated by tapered radial webs.
for s,side in [(1,'L'),(-1,'R')]:
 for wi,y in enumerate([-2.06,-.80,.19,1.18,2.17]):
  z=.555;bits=[]
  for off in [-.115,.115]:
   x=s*(1.32+off);bits += [cyl((x,y,z),.488,.10,'Rubber','X',64),cyl((x+s*.053,y,z),.402,.025,'Paint','X',64),cyl((x+s*.069,y,z),.343,.008,'Interior','X',48),ring((x+s*.073,y,z),.367,.035,'Paint','X',64)]
  x=s*1.52
  # Five broad dished cast spokes, a starfish casting rather than flat wagon spokes.
  for k in range(5):
   a=2*pi*k/5;vv=[]
   for rad,wid,xx in [(.105,.075,1.58),(.245,.115,1.55),(.37,.067,1.505)]:
    for sign in [-1,1]:vv.append((s*xx,y+rad*sin(a)+sign*wid*cos(a),z+rad*cos(a)-sign*wid*sin(a)))
   ob=mesh('cast radial web',vv,[(0,1,3,2),(2,3,5,4)],smooth=True)
   mod=ob.modifiers.new('cast web thickness','SOLIDIFY');mod.thickness=.036
   bevel(ob,.018,3);bits.append(ob)
  bits += [cyl((s*1.53,y,z),.145,.105,'Paint','X',32),cyl((s*1.59,y,z),.088,.012,'Metal','X',24)]
  for k in range(6):a=2*pi*k/6;bits += [bolt((s*1.592,y+.112*sin(a),z+.112*cos(a)),'X',.013)]
  wheels.append(join(bits,f'Wheel_{side}{wi+1}',(s*1.32,y,z)))
 for ind,y in [(6,-2.79),(7,2.79)]:
  z=.73;bits=[cyl((s*1.33,y,z),.345,.26,'Metal','X',48),cyl((s*1.51,y,z),.25,.038,'Interior','X',40),ring((s*1.55,y,z),.31,.030,'Paint','X'),cyl((s*1.56,y,z),.105,.065,'Paint','X')]
  for k in range(12):
   a=2*pi*k/12;ob=box((s*1.54,y+.222*sin(a),z+.222*cos(a)),(.045,.055,.19),'Paint',.009);ob.rotation_euler[0]=-a;bits.append(ob)
   if ind==7:
    ob=box((s*1.34,y+.36*sin(a),z+.36*cos(a)),(.30,.095,.10),'Metal',.012);ob.rotation_euler[0]=-a;bits.append(ob)
  wheels.append(join(bits,f'Wheel_{side}{ind}',(s*1.32,y,z)))
# Tread path: five-wheel bottom contact and wrap around front/rear idler.
def patch_glb(path):
 b=Path(path).read_bytes();n,typ=struct.unpack_from('<II',b,12);j=json.loads(b[20:20+n]);tail=b[20+n:]
 for m in j.get('materials',[]):
  if m['name']=='Paint':m['pbrMetallicRoughness']['baseColorFactor']=PAINTS[0][1]+[1]
 raw=json.dumps(j,separators=(',',':')).encode();raw+=b' '*((-len(raw))%4)
 Path(path).write_bytes(struct.pack('<4sII',b'glTF',2,20+len(raw)+len(tail))+struct.pack('<II',len(raw),0x4E4F534A)+raw+tail)
 return j
def export(objs,path):
 # Remove collapsed bevel triangles without changing any articulated object transform.
 for ob in objs:
  if ob.type!='MESH':continue
  bm=bmesh.new();bm.from_mesh(ob.data);bmesh.ops.triangulate(bm,faces=list(bm.faces))
  dead=[f for f in bm.faces if f.calc_area()<1e-12]
  if dead:bmesh.ops.delete(bm,geom=dead,context='FACES')
  bm.to_mesh(ob.data);bm.free();ob.data.update()
 bpy.ops.object.select_all(action='DESELECT')
 for o in objs:o.select_set(True)
 bpy.ops.export_scene.gltf(filepath=str(ROOT/path),export_format='GLB',use_selection=True,export_yup=True,export_apply=True,export_texcoords=True,export_normals=True,export_materials='EXPORT',export_image_format='JPEG',export_jpeg_quality=90,export_cameras=False,export_lights=False,export_extras=True)
 return patch_glb(ROOT/path)
ja=export(healthy,'t55-tank.glb')
print('HEALTHY_EXPORTED',flush=True)
# Damage twins retain exactly the healthy part origins and the same local frame.
def copy_obj(o,name=None):
 n=o.copy();n.data=o.data.copy() if o.data else None;bpy.context.collection.objects.link(n);n.parent=None;n.matrix_world=o.matrix_world.copy()
 if name:n.name=name
 return n
def parent_world(o,p):
 bpy.context.view_layer.update();wm=o.matrix_world.copy();o.parent=p;o.matrix_world=wm;bpy.context.view_layer.update()
HD=empty('Hull_Damage',(0,0,0));TD=empty('Turret_Damage',T)
damage=[HD,TD];twins={}
for p in parts:
 if any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum','EngineGrille','ExhaustShroud','Turret_IR','Turret_Sight','Turret_Cupola']):
  d=copy_obj(p,p.name.replace('Part_','Dmg_'));vlist=d.data.vertices
  # Bend sheet extremities, crush barrels and wrench mounted fixtures from their seats.
  extent=max((v.co.length for v in vlist),default=1)
  for v in vlist:
   x,y,z=v.co;fall=max(0,(abs(y)/max(.01,extent)-.15))
   if 'Fender' in p.name:v.co.z+=.34*fall*sin(y*2.1);v.co.x+=.13*fall
   elif 'FuelDrum' in p.name:v.co.x+=.085*sin(y*10+z*8);v.co.z-=.075*(1+sin(y*8))
   elif 'Grille' in p.name:v.co.z+=.16*max(0,sin(x*4+y*5))
   else:v.co.z+=.09*sin(y*7+x*4);v.co.x+=.055*sin(z*12+y*5)
  # torn black/steel section carried on twin itself
  for poly in d.data.polygons:
   if (poly.center.y>0 and poly.center.x<.15) or random.random()<.035:
    if M['Burnt'].name not in [m.name for m in d.data.materials]:d.data.materials.append(M['Burnt'])
    poly.material_index=len(d.data.materials)-1
  if not p.name.startswith('Part_Turret') and any(k in p.name for k in ['Fender','Stowage','FuelCell','FuelDrum']):
   # Ragged through-tear cut into the actual replaceable panel, not a painted decal.
   pc=d.matrix_world.translation;cv=[]
   for zz in [-.65,.65]:
    for k in range(10):
     aa=k*2*pi/10;rr=.105*(1+.24*sin(k*13.3));cv.append((pc.x+.06+rr*cos(aa),pc.y+.12+rr*1.6*sin(aa),pc.z+zz))
   cf=[tuple(range(9,-1,-1)),tuple(range(10,20))]+[(k,(k+1)%10,(k+1)%10+10,k+10) for k in range(10)]
   cut=mesh('ragged tear tool',cv,cf,'Burnt');apply(cut)
   bpy.context.view_layer.objects.active=d;mod=d.modifiers.new('Torn equipment shell','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cut
   bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name
# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
def impact(center,normal,r=.082,penetration=False,project=None):
 n=Vector(normal).normalized();q=Vector((0,0,1)).rotation_difference(n);v=[];f=[]
 # flat outer soot rim, scraped silver rim, dark inward-facing crater floor
  z=1.88+.07*(i%2);rx=1.16 if i%2==0 else 1.13;ry=1.26 if i%2==0 else 1.23
  c=(rx*cos(angle),T[1]+ry*sin(angle)+.075*(z-T[2]),z);normal=(cos(angle),sin(angle),.40)
  bits+=impact(c,normal,.066,i==0,turret_surface)
 o=join(bits,'Scar_Turret_'+face,T);parent_world(o,TD);damage.append(o);scar_names.append(o.name)
broken=[]
for tr in tracks:
 d=copy_obj(tr,tr.name+'_Broken');side=1 if tr.name=='Track_L' else -1
 # Each link is moved rigidly to retain its construction. A loose upper run falls outside the road wheels.
 for v in d.data.vertices:
  co=v.co;p,q=track_samples[track_kd.find((co.y,co.z,0))[1]]
  y,z=p
  if z>.93:
   co.x+=side*.56;co.z-=z-.06;co.y-=.5
  elif y<-2.7:
   t=max(0,min(1,(z-.06)/.9));co.x+=side*.56*t;co.y-=1.2*t;co.z-=max(0,z-.07)*.96
 low=min(v.co.z for v in d.data.vertices)
 for v in d.data.vertices:v.co.z-=low
 mod=d.modifiers.new('Broken tread game mesh','DECIMATE');mod.ratio=.65;apply(d)
 parent_world(d,HD);damage.append(d);broken.append(d)
# Destroyed gun uses the actual mantlet and tube, bent at the trunnion with a ripped muzzle.
bits=[copy_obj(gun),copy_obj(barrel)]
def hide_group(objs,hide):
 for o in objs:o.hide_render=hide
hide_group(D,True)
# studio ground, sky and large soft daylight sources
bpy.ops.mesh.primitive_plane_add(size=200,location=(0,0,-.032));ground=bpy.context.object;ground.name='Studio_Ground'
mat=bpy.data.materials.new('Studio');mat.diffuse_color=(.19,.205,.215,1);ground.data.materials.append(mat)
world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.62,.70,.80,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
for name,loc,power,size in [('Daylight',(-4,-6,9),2100,7),('Fill',(5,-1,6),850,6),('Rim',(0,6,7),2400,5)]:
 data=bpy.data.lights.new(name,'AREA');data.energy=power;data.shape='DISK';data.size=size;o=bpy.data.objects.new(name,data);S.collection.objects.link(o);o.location=loc;o.rotation_euler=(Vector((0,0,1))-o.location).to_track_quat('-Z','Y').to_euler()
camdata=bpy.data.cameras.new('Camera');cam=bpy.data.objects.new('Camera',camdata);S.collection.objects.link(cam);S.camera=cam
cam.location=(9,-12,5.9);target=Vector((0,-.65,1.1));cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler();camdata.type='ORTHO';camdata.ortho_scale=10.8;camdata.lens=48
S.view_settings.view_transform='AgX';S.render.resolution_percentage=100;S.render.film_transparent=False
S.render.image_settings.color_mode='RGB'
def render(name,w=1920,h=1080,samples=24):
 S.render.resolution_x=w;S.render.resolution_y=h;S.cycles.samples=samples;S.render.filepath=str(ROOT/name);bpy.ops.render.render(write_still=True)
render('final.png')
cam.location=(10,0,3);cam.rotation_euler=(Vector((0,-.85,1.2))-cam.location).to_track_quat('-Z','Y').to_euler()
# exact orthographic side along X
cam.location=(12,-.85,1.3);cam.rotation_euler=(Vector((0,-.85,1.3))-cam.location).to_track_quat('-Z','Y').to_euler();camdata.ortho_scale=10.8
render('side.png',1920,1080)
cam.location=(9,-12,5.9);cam.rotation_euler=(target-cam.location).to_track_quat('-Z','Y').to_euler()
clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
S.view_layers[0].material_override=clay;render('clay.png');S.view_layers[0].material_override=None
# Exercise every articulated node at 30 degrees, retain a visual evidence render and reset.
moving=[o for o in A if o.name in ['Turret','Gun','Barrel','MG'] or o.name.startswith(('Wheel_','Hatch_'))]
old={o:o.matrix_basis.copy() for o in moving}
for o in moving:
 o.rotation_mode='XYZ'
 if o.name=='Barrel':o.location.y+=.13
 else:o.rotation_euler[2 if o.name in ['Turret','MG'] else 0]+=(-pi/6 if o.name.startswith('Hatch_') or o.name=='Gun' else pi/6)
render('pivots.png',1280,720,16)
for o,m in old.items():o.matrix_basis=m
# Contact-sheet composition entirely in Blender images (no external renderer).
def sheet(paths,out):
 images=[bpy.data.images.load(str(ROOT/p),check_existing=False) for p in paths];w,h=images[0].size
 import numpy as np

codex
The second pass improved the track wrap, curved fenders, and mantlet. I’m now refining the wheel castings and paint, and fixing two problems visible in the damage proof: stretched broken links and stray geometry around torn boxes.

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "cat > /tmp/t55-rev3.py <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text()
s=s.replace(\"('Rubber','rubberized_track',(.025,.027,.025)\",\"('Rubber','rubberized_track',(.012,.013,.012)\")
s=s.replace(\"('TrackSteel','rusty_metal',(.12,.105,.085)\",\"('TrackSteel','rusty_metal',(.15,.10,.065)\")
s=s.replace(\"('Burnt','rusty_metal',(.075,.065,.055),.35,.94)\",\"('Burnt','green_metal_rust',(.055,.055,.052),.25,.94)\")
s=s.replace(\"color=(.12,.12,.12,1);ramp.color_ramp.elements[1].color=(.91,.91,.91,1)\",\"color=(.55,.55,.55,1);ramp.color_ramp.elements[1].color=(.97,.97,.97,1)\")
s=s.replace(\"weather.inputs[0].default_value=.72\",\"weather.inputs[0].default_value=.45 if name=='Paint' else .72\")
s=s.replace(\"default_value=.42 if name=='Paint' else .2\",\"default_value=.22 if name=='Paint' else (0 if name=='Burnt' else .2)\")
s=s.replace(\"nn.inputs['Strength'].default_value=.75\",\"nn.inputs['Strength'].default_value=.10 if name=='Burnt' else .55\")
s=s.replace(\"(.62,.70,.80,1)\",\"(.75,.78,.78,1)\")
s=s.replace(\"for y in [-2.98,2.97]:\",\"for y in [-3.19,3.16]:\")
start=s.index('  # Five broad dished cast spokes');end=s.index('  bits += [cyl((s*1.53',start)
s=s[:start]+'''  # Continuous dished wheel casting pierced by five rounded lightening holes.
  vv=[];ff=[];stations=[(.10,1.58),(.22,1.555),(.35,1.51),(.40,1.505),(.40,1.475),(.35,1.48),(.22,1.525),(.10,1.55)]
  for rr,xx in stations:
   for k in range(64):
    aa=2*pi*k/64;vv.append((s*xx,y+rr*sin(aa),z+rr*cos(aa)))
  for j in range(len(stations)):
   for k in range(64):ff.append((j*64+k,j*64+(k+1)%64,((j+1)%len(stations))*64+(k+1)%64,((j+1)%len(stations))*64+k))
  disc=mesh('perforated dished casting',vv,ff,smooth=True)
  # Recalculate winding before boolean holes on the mirrored side.
  bm=bmesh.new();bm.from_mesh(disc.data);bmesh.ops.recalc_face_normals(bm,faces=list(bm.faces));bm.to_mesh(disc.data);bm.free()
  for k in range(5):
   aa=2*pi*k/5;cut=cyl((s*1.54,y+.283*sin(aa),z+.283*cos(aa)),.075,.3,'Interior','X',20);apply(cut)
   bpy.context.view_layer.objects.active=disc;mod=disc.modifiers.new('Rounded cast window','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cut;bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
  bevel(disc,.006,2);bits.append(disc)
''' +s[end:]
s=s.replace(\"mod.ratio=.72\",\"mod.ratio=.60\").replace(\"mod.ratio=.80\",\"mod.ratio=.72\")
s=s.replace(\"pc=d.matrix_world.translation;cv=[]\",\"bounds=[(min(v.co[i] for v in d.data.vertices)-.005,max(v.co[i] for v in d.data.vertices)+.005) for i in range(3)]\\n   pc=d.matrix_world.translation;cv=[]\")
needle=\"bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)\\n  parent_world(d,TD\"
s=s.replace(needle,\"\"\"bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cut,do_unlink=True)
   # Boolean against overlapping equipment shells can retain cutter walls: remove anything outside the original deformed shell.
   bm=bmesh.new();bm.from_mesh(d.data);escaped=[v for v in bm.verts if any(v.co[i]<bounds[i][0] or v.co[i]>bounds[i][1] for i in range(3))]
   if escaped:bmesh.ops.delete(bm,geom=escaped,context='VERTS')
   bm.to_mesh(d.data);bm.free()
  parent_world(d,TD\"\"\")
start=s.index(' # Each link is moved rigidly');end=s.index(' low=min(v.co.z',start)
s=s[:start]+''' # Rigid connected islands prevent individual vertices from stretching between path stations.
 bm=bmesh.new();bm.from_mesh(d.data);todo=set(bm.verts)
 while todo:
  seed=todo.pop();island={seed};stack=[seed]
  while stack:
   v=stack.pop()
   for edge in v.link_edges:
    other=edge.other_vert(v)
    if other in todo:todo.remove(other);island.add(other);stack.append(other)
  center=sum((v.co for v in island),Vector())/len(island);p,q=track_samples[track_kd.find((center.y,center.z,0))[1]];y,z=p
  if z>.93 or (y<-2.7 and z>.2):
   angle=atan2(q[1],q[0]);rot=Matrix.Rotation(-angle,3,'X');dest=Vector((center.x+side*.56,center.y-.5,.065))
   if y<-2.7:dest.y=-3.15-(z-.2)*1.3
   for v in island:v.co=dest+rot@(v.co-center)
 bm.to_mesh(d.data);bm.free()
''' +s[end:]
p.write_text(s)
PY
python3 /tmp/t55-rev3.py
python3 -m py_compile build_t55-tank.py
rg -n 'ratio=|atan2|from math' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
2:from mathutils import Vector, Matrix
4:from math import sin, cos, pi
266:from mathutils.kdtree import KDTree
275:  p,q=sample(i/96);y,z=p;ang=math.atan2(q[1],q[0]);x=s*1.321
382: mod=o.modifiers.new('Game geometry budget','DECIMATE');mod.ratio=.60 if o in wheels else .80
491:   ang=math.atan2((point.y-T[1]-.075*z)/ry,point.x/rx)
516:   angle=atan2(q[1],q[0]);rot=Matrix.Rotation(-angle,3,'X');dest=Vector((center.x+side*.56,center.y-.5,.065))
522: mod=d.modifiers.new('Broken tread game mesh','DECIMATE');mod.ratio=.65;apply(d)
570: mod=o.modifiers.new('Wreck LOD','DECIMATE');mod.ratio=.36;apply(o)

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "sed -i \"s/angle=atan2(/angle=math.atan2(/; s/mod.ratio=.60 if o in wheels else .80/mod.ratio=.60 if o in wheels else .72/\" build_t55-tank.py
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc 'cat /tmp/t55-contract.py' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
import json,struct,sys,numpy as np
from pathlib import Path
root=Path(sys.argv[1]);meta=json.loads((root/'nodes.json').read_text())
def read(n):
 d=(root/n).read_bytes();sz=struct.unpack_from('<I',d,12)[0];return json.loads(d[20:20+sz])
a=read('t55-tank.glb');b=read('t55-tank-damage.glb')
def maps(g):
 nodes={n['name']:n for n in g['nodes']};parent={g['nodes'][c]['name']:n['name'] for n in g['nodes'] for c in n.get('children',[])};return nodes,parent
A,ap=maps(a);B,bp=maps(b)
assert ap['Gun']=='Turret' and ap['Barrel']=='Gun' and ap['Muzzle']=='Barrel' and ap['MG']=='Turret'
for n in ['Seat_Commander','Seat_Driver','Exhaust','Light_Head_L','Light_Head_R','Fx_Engine','Fx_Ammo','Fx_Hatch','Muzzle']:assert 'mesh' not in A[n]
assert {b['nodes'][i]['name'] for i in b['scenes'][0]['nodes']}=={'Hull_Damage','Turret_Damage','Wreck_Hull','Wreck_Turret'}
assert len([n for n in A if n.startswith('Part_')])>=14
assert len(meta['damage']['scars'])==8
aa={n['name']:np.array(n['world_position']) for n in meta['nodes']};bb={n['name']:np.array(n['world_position']) for n in meta['damage_nodes']}
assert np.linalg.norm(aa['Muzzle']-[0,1.94,5.775])<.001
for p in meta['damage']['parts']:
 if p['twin']:
  assert p['part'] in A and p['twin'] in B
  assert np.linalg.norm(aa[p['part']]-bb[p['twin']])<.001
for g in [a,b]:
 assert not g.get('cameras') and not g.get('animations')
 for m in g['materials']:
  if m['name']=='Paint':assert m['pbrMetallicRoughness']['baseColorFactor']==[.11,.14,.08,1]
for side in ['L','R']:
 ws=[n for n in meta['nodes'] if n['name'].startswith('Wheel_'+side)];ws.sort(key=lambda n:int(n['name'].split(side)[-1]));assert len(ws)==7
 assert all(ws[i]['world_position'][2]>ws[i+1]['world_position'][2] for i in range(6))
assert meta['triangles']['healthy']<=140000 and meta['triangles']['damage']<=110000
assert (root/'t55-tank.glb').stat().st_size<=12000000
print('PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets')
print('Bounds',meta['bounds'],'counts',meta['triangles'])

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "ssh gex44 'tail -5 /root/fal-author/t55-tank-v1/build.log'
cat /home/claude-agent/.agents/skills/blender-game-assets/SKILL.md" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 538ms:
---
name: blender-game-assets
description: "Create Blender game assets and export GLB kits with baked textures; validate renders against reference images."
metadata:
  provenance: adapted
---

# Blender game assets, headless

Distilled from TheLongSilence's Blender pipeline (162 m ship, carved rocks, a
cabin interior kit, 13 ground materials) into a headless-first recipe for
Forge. **No GUI, no BlenderMCP socket** — Forge's Blender lives on gex44 with
no display, and `blender -b` is the one thing BlenderMCP's addon refuses to
run under. Everything below is a plain `blender -b --python` call or the
gex44 exec service.

For architectural construction kits, read `construction-kit` and its tested
source builders. It supplies cross-family profile/damage/UV contracts and
consumer-side checks; use only the relevant elements.

For a connected playable scene, also read `visual-game-loop` and its
`references/whole-scene-blender.md`: the user-approved harbour recipe combines
scene/object references, photographic materials and coherent Blender construction
with gameplay verification. Reuse good hero assets; author the surrounding place
as a whole rather than assuming a larger modular catalog will fix assembly.

## Read only what the task needs

| When | Read |
| --- | --- |
| A dense model must become a light one that keeps its look (normal + AO transfer) | [high-to-low baking](reference/high-to-low-baking.md) |
| Preparing UVs or a cage, or a bake shows seams, black faces, wrong highlights | [baking and diagnostics](reference/baking-and-diagnostics.md) |
| Choosing texture or mesh formats, or the asset is slow to load or heavy in GPU memory (KTX2, WebP, meshopt, Draco) | [asset delivery](reference/asset-delivery.md) |
| Before any long bake or scripted export pipeline | [preflight and recovery](reference/preflight-and-recovery.md) |
| The asset looks right in Blender and wrong in the game, or the cause could be either | [runtime parity and diagnostics](reference/runtime-parity-and-diagnostics.md) |
| The asset will be judged by eye (hero prop, character, building, environment) | [author and critic loop](reference/critic-loop.md) |
| Terrain, cliffs or rocks should look weathered (branching gullies and ridges, no simulation) | [terrain erosion](reference/terrain-erosion.md) |

These seven are loaded on demand, not by default. Five are ported from vercel-labs/vgpu (see Attribution); terrain erosion uses Rune Skovbo Johansen's filter (MPL 2.0, `scripts/erosion/`).

### Choose how to carry each detail before any bake

| Detail | Carry it as |
| --- | --- |
| Silhouette, openings, broad edges, tuft dimples, piping, moving parts | Real low-poly geometry |
| Fine bevel curvature and shallow relief the triangle budget cannot afford | Tangent-space normals baked from the dense source |
| Permanent cavities and contacts inside a rigid assembly | Baked AO |
| Fabric weave, grain, micro-texture | The existing tiled map at its own scale, never re-baked into a unique atlas |
| Contacts that change, directional shadows | Runtime lighting |

**Pick the cheapest carrier that passes the look check. Being under a texture budget is not a reason to
spend it.** A unique normal atlas is the last resort, for detail the triangle budget cannot hold: a
1024 px RGBA8 map with mips is 5.6 MB of GPU memory per asset, and it replaces a tiled map that every
copy of the material could have shared. If you try a bake and geometry plus the source's tiled maps
looks as good, ship the geometry and say so in the report.

Measured (2 Oct 2026, STRANDMON armchair, 233k to 12k triangles, two Astra runs, same brief): dimples kept
as geometry with the two original 256 px tiled maps = 0.46 MB download, 0.7 MB GPU textures. Same detail
baked into a unique 1152 px normal map = 1.19 MB download, 7.4 MB GPU textures, slightly closer from across
the room, slightly weaker up close, and a blind judge preferred the geometry version.

## Which representation: decide before modelling

For furniture reconstructed from photographs, datasheets or assembly instructions,
read [Furniture reconstruction checks](reference/furniture-reconstruction.md)
before generating geometry. It covers panel-relative coat-hook placement,
interior compartment counts and optional door/drawer articulation.

| Need | Representation | Why |
| --- | --- | --- |
| Hero or enemy character with a walk and attacks | imported rigged mesh (this skill, or the CC0 library: Quaternius, KayKit, Mixamo motions) | skinning, retargetable clips; procedural rigs read as mannequins |
| Weapon, prop, creature variant where silhouette, sockets, collision or code-driven variants matter | procedural three.js geometry or a small GLB kit part | controllable, cheap to vary per instance |
| Concept, icon, backdrop, card art | a generated 2D image used directly | never rebuilt as geometry |
| A reference image whose visible FORM must become a code model | `img2threejs` with its gates; say the result is a reconstruction, not extracted geometry | likeness is judged, not measured |

Pick once at the blueprint or stack-selection stage and record it with provenance (source, licence,
metres per unit, forward axis). Design after MengTo/Skills build-hybrid-game-assets (MIT).

## 1. The recipe

The concept image is the spec, not decoration. For every asset in a kit:

1. **Model every piece in Blender from the concept image** using loft/recess/
   greeble (§3). Grey-clay render it before touching a texture (§4, §10) —
   box-stacking hides under any lighting rig except flat grey + one hard key.
2. **Use a fitting registered photographic texture set or an image model** for
   photographic surfaces (ground, foliage, cloth). Record origin, license and
   physical scale; matching normal/roughness maps must remain aligned. Use an
   existing suitable licensed scan before generating a replacement; use Cycles nodes only for what
   genuinely varies by geometry (edge wear, per-plate tone), and flatten
   before export (§6).
3. **Screenshot-vs-concept loop.** Render next to the concept, same angle if
   possible, compare. Judge by measured numbers where you can (§10: tone
   percentiles, AO floor, draw calls), by eye where you can't (silhouette,
   chamfer read, material believability). Iterate until it reads as the
   concept, not until it "looks 3D".
4. **Export once clay AND texture both hold up.** A model that's flat-correct
   in clay but goes muddy after baking has a material bug, not a modelling
   bug — don't re-model to fix a bad bake.

## 2. Headless setup on gex44

Blender 5.2.0 LTS, x64, RTX 4000 Ada, at
`/root/blender-spike/blender-5.2.0-linux-x64/blender`.

**A. Direct subprocess** (matches the source game's `build_*.py` pattern):
```python
BLENDER = "/root/blender-spike/blender-5.2.0-linux-x64/blender"
cmd = [BLENDER, "--background", "--factory-startup", "--python-exit-code", "1", "--python", __file__,
       "--", "BUILD"] + extra_args
# script: `if 'BUILD' in sys.argv: blender_main(...)` else `drive(...)`
```
Split into `drive()` (host: subprocess + result check) and `blender_main()`
(only imports `bpy`/`bmesh` — importing them outside `-b` crashes with no
display). **Without `--python-exit-code 1`, Blender can exit 0 after a Python error.**
Set that flag, check the exit code and logs, and verify fresh output files.
Mesh/export validation still matters: a successful process is not visual proof.

**B. gex44 exec service** (`/opt/astra-blender/blender_exec_server.py`,
loopback `:8793`, token-guarded): POST a python script, get back stdout plus
render paths, for interactive iteration without a subprocess per call. Same
headless constraint — the script is a `blender_main`-shaped body, no GUI code.

Outputs land in the app's `public/models/` (or the GameKit pack's asset dir)
as `.glb` + `.webp`. Draft render: 64 samples / 1280x720 ≈ 2 s on an M-series
GPU (source game, Apple Silicon) — **gex44/RTX 4000 Ada timing is
unmeasured; get one real number before quoting a render budget.**

## 3. Modelling: loft, recess, greeble

Three techniques, in order of impact.

**Loft cross-sections, never stack primitives.**
```python
def oct_ring(w, h, cx, cz):
    a, b = w * 0.5, h * 0.5
    return [( a, b-cz), ( a-cx,  b), (-(a-cx),  b), (-a,  b-cz),
            (-a, -(b-cz)), (-(a-cx), -b), ( a-cx, -b), ( a, -(b-cz))]

def loft(name, sections, mat):    # sections: (y, w, h, cx, cz, dz)
    bm = bmesh.new()
    rings = [[bm.verts.new((x, y, z+dz)) for (x, z) in oct_ring(w, h, cx, cz)]
             for (y, w, h, cx, cz, dz) in sections]
    for A, B in zip(rings, rings[1:]):
        for i in range(8):
            j = (i+1) % 8
            bm.faces.new((A[i], A[j], B[j], B[i]))
    bm.faces.new(list(reversed(rings[0]))); bm.faces.new(rings[-1])
```
Keep the profile **stepped, not tapered** — a parallel midbody, a shoulder, a
blunt end. Steps are what the eye measures scale against.

**Cut detail into the skin**, not glued on top:
```python
sel = [f for f in bm.faces if pick(f)]
bmesh.ops.inset_region(bm, faces=sel, thickness=1.2, depth=0.0,
                       use_even_offset=True, use_boundary=True)
for f in sel:
    bmesh.ops.translate(bm, verts=list(f.verts), vec=f.normal.normalized()*-0.7)
    f.material_index = i_recess
```

**Detail hierarchy, including restraint.** Primary masses, panel bays, fine
greebles at roughly **1/60 of the asset's longest dimension**. Zone them and
**leave clean plate** — greebling every face reads as noise; detail only
registers against something undetailed. Flat-shade hard surfaces.

**A Bevel modifier does nothing on face-soup geometry** — bmesh ops emit
every face with fresh vertices, no shared edges to bevel. Weld first, then
chamfer:
```python
def weld_bevel(ob, width=0.0025, segments=2, angle=math.radians(31), dist=2e-5):
    me = ob.data
    bm = bmesh.new(); bm.from_mesh(me)
    bmesh.ops.remove_doubles(bm, verts=bm.verts, dist=dist)   # joins coincident boxes
    bm.to_mesh(me); bm.free(); me.update()
    apply_bevel(ob, width=width, segments=segments, angle=angle)
```
A 90-degree edge returns no highlight from any light — the single largest
thing separating "modelled" from "a pile of boxes". `o.scale = size` then
Bevel makes pillows (Bevel is local-space) — `transform_apply(scale=True)`
before bevelling.

## 4. Kit-bake pipeline (interior_bake/ distilled)

For a repeated kit (a corridor, a room set, a prop family), stage the build
so nothing bakes twice and occlusion bakes into the placement it ships in:

1. **Tile geo** — hi-poly tile (plates, rivets, hatches) as a **3x3 array**
   so only the centre tile bakes and its edges see real neighbours (no
   cross-fade). Panel tile 2.0 m, deck tile 1.5 m in the source kit.
2. **Tile bake** — bake **height by ray-tracing an Emission shader whose
   colour is world-Z**, not a tangent-space NORMAL bake off a flat cage: a
   vertical panel-gap wall has no cross-section for a downward ray, so a
   NORMAL bake off a plane records nothing for it. Height + a prefilter gives
   both the seams and a slope a texel wide.
   ```python
   sc.render.bake.use_selected_to_active = True   # hi -> flat lo plane
   sc.render.bake.cage_extrusion = 0.05
   ```
3. **Compose** (numpy) — prefiltered normal from height (clamp depth *before*
   differentiating: an undamped 26 mm slot over two texels is a normal lying
   flat, rendering as a crawling black slit); crown/cavity masks drive wear
   and grime; procedural stencils (part numbers, hazard stripes) into albedo.
4. **Kit** — parametric part builders on a shared profile/loft/box library
   (`Part`-style primitives, per-edge bevel, a material "slot" tag).
5. **Props / assemble** — instantiate every master once, `weld_bevel` each
   with a **hand-tuned width per part class** (finer on small props — a
   2.5 mm round-over eats a 6 mm book board), lay the kit out at its in-game
   transforms *before* baking so occlusion matches what ships.
6. **UV + AO bake**:
   ```python
   def unwrap_and_pack(masters, res=2048):
       for ob in masters.values():   # per-object smart UV project, then:
           ...
       bpy.ops.uv.average_islands_scale()
       bpy.ops.uv.pack_islands(margin=0.006, rotate=True)

   def bake_kit_ao(masters, occ, res=2048, dist=1.5, samples=128):
       sc.cycles.samples = samples
       # AO node -> Emission -> Material Output, per material, bake EMIT
   ```
   **AO bakes along the surface normal — wind kit-hull skin facing INTO the
   room**, or it bakes unoccluded everywhere (open space). **Floor-lift the
   result** — occlusion is a modulation, not a shadow; anything reaching
   pure 0 paints a black line lighting can never recover
   (`a2 = 0.34 + 0.66*a**0.85`).
7. **Clay check** before any texture or bake is trusted (§10).

**Texel density**: panel shipped 2048 px / 2.0 m = **1024 px/m**; deck
1024 px / 1.5 m = **683 px/m**; the interior kit's UV/AO atlas ran at
**4096 px** (the bake function's own default is 2048 — override per project,
don't trust a library default). Pick texel density from viewing distance: a
corridor the player's shoulder passes within 40 cm of needs more than a
ceiling never seen close.

## 5. Rocks and foliage

**Rocks** (`build_rocks.py`): carve, don't deform a sphere — a deformed
icosphere is convex-ish every time (the "potatoes" problem). Instead: dense
icosphere → `bmesh.ops.bisect_plane(..., clear_outer=True)` several times for
fracture faces (family-dependent: slab/block/boulder/column/shard) → smaller
bisects near corners for chips → two octaves of `mathutils.noise.noise`
displacement along the normal → `REMESH` (voxel) to heal cuts into one
manifold → `DECIMATE` to a triangle budget → `shade_smooth_by_angle` so
fracture edges stay sharp → bake AO to a `BYTE_COLOR` vertex attribute
(spread instances apart *before* baking — stacked at the origin they occlude
each other into a mean of 0.2) → normalise so the longest axis is 1 and the
low point sits at 0. Ship **8-11 variants across 3 LODs** (full, ~500 tri,
~160 tri) in one GLB, `export_vertex_color='ACTIVE'`, no materials — AO rides
in `COLOR_0`, the shader supplies the surface.

**Foliage** (`pack_leaf.py`): pack an image-model leaf-cluster cutout (RGBA,
transparent bg) into a 512x512 lossless atlas. Normalise each RGB channel's
mean over opaque pixels to 0.5, so the image contributes *variation about the
palette* rather than its own green. Dilate outward into the transparent
margin — bilinear alpha filtering averages the last opaque texel with its
transparent neighbour, and a black neighbour puts a dark fringe on every
edge. Ten dilation passes covers a 512-texel margin at any mip seen.

## 6. Materials

**Procedural (Cycles-only, geometry-driven):** per-plate tonal variation +
pointiness edge wear, the two nodes that make paint look built:
```python
vor = nt.nodes.new("ShaderNodeTexVoronoi"); vor.inputs["Scale"].default_value = 0.16
# RGBToBW -> MapRange 0.9-1.1 -> Multiply into base colour: plate batches
# never quite match, and that mismatch is most of what reads as "welded".
geo = nt.nodes.new("ShaderNodeNewGeometry")
pr = nt.nodes.new("ShaderNodeMapRange")   # From 0.49-0.56, clamp, -> wear factor
nt.links.new(geo.outputs["Pointiness"], pr.inputs["Value"])
# mix toward bare metal + drive Metallic up: free on every convex corner,
# exactly where paint goes in life.
```
Also: bleach on sun-facing normals (`dot(Normal, sun_dir)`), soot along an
object-space axis. **These do NOT survive glTF export** — three.js never
sees the node graph. Bake to a texture before export, or export flat base
colours per material bucket and let the app's own shader apply bleach/soot
from world position (what the source game does).

**Image-model derived** (ground, cloth, rock faces): one generated albedo is
the only photographic input, everything else *derived* in numpy so it can't
disagree with it:
- `height_from_albedo` — 3 band-passed luminance scales (fine/mid/coarse),
  weighted toward the middle — "dark is deep" is the prior every
  albedo-to-normal tool uses and it holds for ground.
- `normal_from_height` — central difference of the height field.
- `ao_from_height` — horizon-based, 16 directions, cone-stepped march.
- `roughness_heuristic` — dust in cavities (rough), exposed faces polish
  (less rough), clamped to an art-direction matte floor.
- **Seam fix in the gradient domain**, not by blending pixel values: take the
  gradient, force it periodic across the wrap by killing the seam's jump
  over a margin of a few px (weight ramps 0→1 away from the seam), then
  FFT-Poisson-integrate back. Mismatch lands in the lowest-frequency mode
  (an invisible ramp) instead of a visible strip at the border — a wide
  margin instead draws bright bars through the derived occlusion.

An image model asked to paint colour onto a rendered height map **redraws
the geometry** (measured: same style, every stone somewhere else). Asked to
*colourise* a flat, shading-free render of the SAME image, it keeps every
stone in place — colourise, don't paint-over, when height must register to
albedo.

## 7. Lighting and camera

**Void/hero lighting**: one hard key (`SUN`, angle ≈ 0.9°), a large weak
fill tinted toward the key's complement, a cold rim so nothing dissolves
into the background. Shadows never fully black. **Camera on the key side** —
a hero angle from the shadow side is carried by fill and reads washed out.

**Clay/QA lighting** (three `SUN`s: key, rim, bounce from below) — the
bounce matters because half of any interior's surfaces face down (an
overhead console, a coaming's underside) and key+rim alone renders them as
unreadable black.

**Camera from the bounding box, never by hand** — hand-placed cameras end up
inside geometry, costing **80x render time** (near-field bounces: 166 s vs
2 s measured):
```python
pts = [o.matrix_world @ Vector(c) for o in meshes for c in o.bound_box]
lo = Vector((min(p[i] for p in pts) for i in range(3)))
hi = Vector((max(p[i] for p in pts) for i in range(3)))
ctr = (lo + hi) / 2; rad = max((p - ctr).length for p in pts)
cam.location = ctr + direction * (rad / math.tan(cam.data.angle / 2) * 1.05)
cam.rotation_euler = (ctr - cam.location).to_track_quat("-Z", "Y").to_euler()
```
`to_track_quat` assumes Z-up world; if the asset is authored Y-up inside
Blender's Z-up slots, build the look-at basis by hand (cross products off
the target vector and the game's own up axis) or every render is on its side.

**Voronoi stars, never thresholded noise** — noise can't separate density
from size (raise frequency to shrink points → thousands; widen the band to
brighten → falling snow). Voronoi: cell scale = how many, distance threshold
= how big. Cells over a sphere ≈ `4π·scale²`, a frame sees under 1% of it, so
`scale=30` puts ~15 cells in shot — use `scale ≈ 110`. Angular radius =
`threshold / scale`; move both together.

**Backdrop geometry must be camera-visible only.** A large emissive shell
(planet, skybox) hit by diffuse/glossy rays becomes an area light every
shading point importance-samples — measured **145 s → 4.3 s**:
```python
for o in (planet, atmo):
    o.visible_diffuse = o.visible_glossy = o.visible_transmission = False
    o.visible_volume_scatter = o.visible_shadow = False
```

## 8. Export contract for three.js

- **Join per material within each rigid assembly before export.** Keep moving
  doors/drawers, their attachment groups and required named parts separate;
  never merge them into the static carcass just because they share paint.
  One Blender object = one glTF node =
  one draw call. A loose 11-material ship export was 78 draws;
  `bpy.ops.object.join()` per material group brought it to ~11.
- **Metres, Y-up**: `bpy.ops.export_scene.gltf(export_format='GLB',
  use_selection=True, export_apply=True, export_yup=True)`. (The source game
  exports `export_yup=False` because its own runtime is Y-up-in-Blender's-
  Z-up-slots by convention — a plain three.js consumer wants `export_yup=True`.)
- **Flat base colours or baked textures only** — procedural nodes don't
  survive the round trip (§6). `KHR_materials_emissive_strength` DOES
  survive — nav lights, emissive panels keep authored intensity.
- **Draco for real triangle counts**: position 14-bit quantization is ~1 mm
  over a 16 m interior (a tenth of the smallest chamfer), normal 10-bit,
  texcoord 12-bit, compression level 6.
- **WebP out of Blender directly is lossless regardless of the quality
  argument** — its own quality slider is silently ignored. PNG-dump from
  Blender, encode to WebP with PIL on the host if you need real lossy quality.
- **Check draw calls after adding anything** — a duplicated kit piece is one
  draw call against a shared mesh no matter how many times placed; a fresh
  join is not.

## 9. Traps

- Bevel on bmesh-authored geometry does nothing (no shared edges) — weld
  first (§3). `o.scale` then Bevel makes pillows — apply scale first.
- `matrix_parent_inverse = parent.matrix_world.inverted()` cancels the
  parent transform (the "keep transform" idiom). Leave it at identity for
  the child to inherit the parent's rotation.
- A rotation about the wrong axis silently does nothing visible — a panel
  whose normal is +X doesn't change facing when rotated about X. Measure the
  world normal against the view vector rather than reasoning about it.
- Map Range with `To Min > To Max` and clamp on collapses to zero (clamps to
  an inverted interval) — invert with a `SUBTRACT` node instead.
- A Mix node in RGBA mode can silently drop a branch — several sockets share
  the name "Factor". Combine world contributions with two `Background` nodes
  into an `Add Shader` instead.
- The image preview downsamples — 4-px stars average away in a 1080p
  preview. Crop 1:1 and count bright pixels before concluding nothing rendered.
- A tangent-space NORMAL bake off a flat plane records nothing for vertical
  geometry — bake height by ray-traced Emission instead (§4).
- AO bakes along the surface normal — a kit skin wound facing away from the
  room bakes unoccluded everywhere.
- An AO map reaching pure black paints an unrecoverable dark line —
  floor-lift it (§4).
- Blender's WebP writer ignores its own quality setting, always lossless —
  PNG-dump and re-encode on the host (§8).
- Blender exits 0 even when the driven script raised — check stderr and the
  output file, not the return code (§2).
- A socket/exec service keeps Blender's *process* environment between calls
  — a default from a stale env var silently sends output into the wrong
  checkout. Assign output paths explicitly every call, never `setdefault`.

**Blender 5.x API changes** (4.x code fails on all of these):
- `Scene.node_tree` gone → `Scene.compositing_node_group`;
  `CompositorNodeComposite` no longer exists — the group's output socket IS
  the result.
- **The compositing group must contain a `CompositorNodeRLayers`.** Feeding
  it only from a Group Input means nothing depends on the render, so Blender
  skips rendering and writes a transparent black frame in 0.1 s. A
  suspiciously fast render is this bug.
- `Action.fcurves` is gone (slotted actions). Set
  `context.preferences.edit.keyframe_new_interpolation_type` *before*
  inserting keys.
- Glare/Lensdist settings moved from properties onto **sockets**; enums take
  display names (`"Fog Glow"`, `"Streaks"`, `"High"`), not old identifiers.
- Legacy addons still install to `~/Library/.../Blender/<ver>/scripts/addons/`
  on macOS — irrelevant on gex44, relevant for local proving.

## 10. Gates (measurable, not "looks right")

- **Independent export audit**: run
  `python3 scripts/audit_glb.py /absolute/path/asset.glb --strict` from this skill
  directory (requires numpy). It reports mesh-local triangles, nonfinite values,
  degenerate triangles, material groups and texture portability. Exit 1 means
  findings; exit 2 means invalid/unsupported input, never a clean bill of health.
  Audit uncompressed output before Draco/meshopt and inspect the compressed
  consumer separately. It does not validate winding, source solids, intersections,
  node-transformed placement, runtime draw calls or gameplay. Keep source meshes
  for topology/volume inspection; check transformed instance bounds in-game.
  The harbour correction's own empty issues list missed 16 zero-area triangles.

- **Rigged-asset rejection gates** (block the asset before it reaches a build; each one is a
  known failure class):
  - a character MAIN model still contains swappable gear (gear is separate parts on sockets);
  - action/animation files carry duplicate render meshes;
  - skeletons or bone names differ across actions of the same character;
  - a required role, socket (`target`, `ground`, `vfx-hit`, `vfx-death`, `attack-*`), collider,
    equipment-slot declaration or provenance field is absent;
  - toggling gear leaves visible fragments or holes without a declared underlayer boundary;
  - an attack animation has no authoritative timing and collision contract (see
    `_game-kit/core/ENEMY-CONTRACT.md`);
  - status language is truthful: `catalog-only` (recorded), `review-only` (inspector exists),
    `runtime` (gameplay loads it). Only `runtime` counts as shipped.
  Mechanical half: `audit_glb.py --rig --require-sockets target,ground,vfx-hit,vfx-death` reports
  skins, joint names, duplicate primitives (identical geometry buffers) and missing named nodes.
  Design after MengTo/Skills build-rigged-game-assets requirements (MIT); the human half stays a
  checklist.
- **Tone stats**: percentile clipping, e.g. "0.00% of pixels clip and the
  99th percentile is 165" — actionable; "looks flat" is not.
- **Contact sheets**: render every set-piece/angle into one grid image,
  judge the set at once rather than one screenshot at a time.
- **Clay check before any bake is trusted**: flat grey, hard key + rim +
  bounce, no textures, no emissives. A silhouette reading as a rectangle or
  an edge reading as infinitely sharp means the model isn't finished —
  textures and lighting hide box-stacking completely, flat clay does not.
- **Re-verify the capture isn't stale**: if the render/dev surface can
  hot-reload mid-capture, re-check the expected state is actually showing
  before saving, restart if not — a loading-state screenshot with a
  plausible number next to it is a silent false pass.
- **Draw-call and fps survey** after adding any asset: report draw count
  against the pre-change baseline (join-per-material should hold it flat)
  and frame time on the heaviest scene the asset appears in.
- **AO sanity**: print the raw bake's percentile spread (1st/10th/50th/90th)
  before floor-lifting — `min == 0` over a large area means winding or
  distance is wrong, not that floor-lift will fix it.
- Numbers not yet measured on gex44/RTX 4000 Ada (draft/final render time,
  bake time for a 4096 atlas): **unmeasured** — get one real run's numbers
  before writing them into a plan or a budget.

## Attribution

Distilled from TheLongSilence (MIT License, Copyright (c) 2026 Anshu
Chimala). Runnable reference code copied under the same license into
`reference/` — see `reference/INDEX.md`.

`reference/high-to-low-baking.md`, `baking-and-diagnostics.md`, `asset-delivery.md`,
`preflight-and-recovery.md` and `runtime-parity-and-diagnostics.md` are ported from
vercel-labs/vgpu `skills/vgpu/blender/references/` at commit 68cb1d8d198c (MIT License,
Copyright (c) 2025 Vercel, Inc.), adapted from vgpu/WebGPU to the three.js runtime.
`reference/critic-loop.md` is distilled from the same repository's asset agent flow.

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "rg -n 'coord|claim|release' /home/claude-agent/AGENTS.md | head -22
sed -n '1,15p;370,387p;660,708p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
28:- **local** `204.168.129.84` — orchestrator. Opus planning, this memory store, the `coord` bus. No app/infra runs here.
62:- **Usable result before tooling expansion:** define the smallest visible end-to-end outcome and deliver it early. Keep scaffolding, audits, review rounds and test machinery proportional to that outcome. Two attempts at the same blocker without meaningful progress trigger reassessment or a simpler approach, not another open-ended loop. Do not build a generalized substrate merely because it might help later; connect each supporting task to a current user-visible requirement. Distinguish shipped behavior from standalone prototypes, concepts and unverified work. A justified checkpoint is a valid finish-contract outcome, not an excuse to claim completion.
66:- **Visual quality is the product**: every change touching templates/prompts must be visually validated before claiming success. "It builds and deploys" ≠ "it looks right".
68:- **Shared harness across models:** agentic workers must receive the same applicable project rules, task-relevant skills, authorized tool/MCP access, coordination and secret guards through their adapter. Load skills selectively, not all at once. Preserve isolation and task-specific permissions; equal harness support does not grant broader authority. Missing wiring is an adapter gap to report or fix, not a reason to declare a model incapable. Verify the chosen lane rather than assuming every helper inherits the full setup.
69:- **Worker model selection:** choose and explicitly pass the least expensive capable model for each task; do not copy the root model/effort automatically or mix models just for variety. Gemini 3.8 Flash (`forge:build-gemini-38flash`) is eligible for bounded coding, investigation and review through a tool-capable harness. Local builders use `forge-agent run --harness gemini --model forge:build-gemini-38flash --repo <repo> --purpose <task> --task <brief>` with a bounded `--timeout`; this runs Claude Code with copied shared skills/rules/hooks, Forge MCP and isolated proxy auth. Proven locally with actual Gemini responses, MCP skill/coord calls, file edits, tests and a blocked secret-guard probe. `--harness gemini-proxy` remains the single-shot no-tools helper for tasks that need no tools. The local Gemini builder currently rejects optional `--jail`; never imply that it ran in a container sandbox. Use `gpt-5.6-luna` for narrow mechanical work, `gpt-5.6-terra` for exploration and bounded implementation, `gpt-6.1-sol` (Sol) for demanding implementation/debugging/review, and `gpt-6-astra` for unusually difficult architecture or reasoning. **Sol = `gpt-6.1-sol` (operator, 2026-09-30):** every Sol request runs GPT-6.1 Sol (Codex CLI >= 0.159.2; 0.156 gets a 400). `sol`/`solx` call it, and the Engine swaps `gpt-6-sol` and `gpt-5.6-sol` for it at launch (`cli/sonnet_retire.py` LATEST_VERSION, also inside `run_tracked_codex_cli`). `gpt-6-luna` (Codex CLI >= 0.156.0) is the GPT-6 option for the Luna tier; not benchmarked yet, so `gpt-5.6-luna` stays the Luna default until a measured run shows it is worth its cost. Claude CLI workers use `--model sonnet`, which is **Sonnet 5.5 only** on this box (alias pinned in `~/.claude/settings.json` since 2026-09-28; never Sonnet 5; the Engine still remaps Sonnet to Opus 5.5). **Haiku 5.5 (2026-10-08):** `--model haiku` = `claude-haiku-5-5` everywhere (alias pinned in `~/.claude/settings.json`; the Engine seam upgrades `haiku`/`claude-haiku-4-5` at launch): $0.10 in / $0.50 out per MTok, 1M context, default effort medium. Use it for classification, extraction, routing, yes/no gates, judges and cheap subagents at effort low or medium; `haikux "prompt"` one-shot, `review --by haiku` for the cheapest second look (same family, not independent), panel seat `haiku-local`. Always pass `--effort`: low for mechanical edits, medium by default, high only for creative or hard work (and for benchmarks, the same effort as the run it is compared with). Native Codex defaults are Terra/medium; explicitly select low effort for straightforward tasks and high only where the reasoning warrants it. Prefer a different family for independent judgment when useful. Escalate after evidence of a capability limit instead of repeated cheap retries; name unavailable models and use a supported alternative. Codex mixed-model spawns use `fork_turns="none"` with a self-contained brief; full-history forks inherit the parent's model and effort.
76:(safety = the PreToolUse secret + coordination guards, not a sandbox):
95:store, coordination protocol, standing laws; `forge-hub/agent/harness_env.py`),
97:memory/skills/coordination. Docs: `forge-hub/agent/DEEPSEEK.md`, `GEMINI.md`.
148:**Max plan API credits (2026-10-08):** each Max 20x plan gives $200/month (Max 5x $100) of Claude Platform credit, claimed on
152:Not claimed yet. Memory `reference_max_plan_monthly_api_credits_2026_10_08.md`.
174:- Task agents from Claude, GPT, Gemini or DeepSeek: `forge-agent run --harness deepseek --model deepseek-flash --repo <git-repo> --purpose <task> --task <brief> --timeout 900`. Same isolated worktrees, shared Forge MCP memory/skills/coord, hooks and finish rules. DeepSeek orchestrators can call the other `forge-agent` harnesses; workers do not recursively delegate.
175:- Thin adapter: `forge-hub/agent/deepseek_worker.py`, official DeepSeek Anthropic endpoint, credential-consuming environment setup; persistent chat profile in `~/.local/share/forge-deepseek/profile`. No new agent loop. Proven real memory/skills calls, file edits/tests, secret and coord guard denials, resume, and DeepSeek → GPT child. No Docker jail support on this local lane.
199:- **sim-town-games** — applies when building or fixing a tycoon, business-sim or town-sim game on the Forge Game Engine (new game = pack + town seed; laws, crowd, shopfronts, release copy)
212:- **Never:** anything with uncommitted edits, a live process in it, or a live coord claim; other sessions' dirs
216:  If unsure whose it is, leave it and `coord note` it.
228:## Multi-Claude coordination (durable)
230:Several Claude Code sessions run on this box and edit the same trees (factory on GEX44, engine on AX42-U, this monorepo mirror). A filesystem bus at `~/.claude/coord/` prevents collisions. The `coord` CLI (`~/.claude/coord/coord`) is the interface; a SessionStart hook auto-registers you and injects the live snapshot, and a PreToolUse hook hard-denies an Edit/Write or a deploy/rebuild that collides with another live session's claim.
233:1. `coord check <host:path>` — is anyone else on it? (exit 3 = conflict)
234:2. `coord claim <host:path> [--note "..."]` — take it (exclusive; auto-expires, TTL 30m, refreshed by heartbeat).
235:3. Do the work, then `coord release <host:path>` (or `--all`).
236:4. `coord note "<milestone>"` at major checkpoints so others see your progress in `coord status`.
239:- Reads need NO claim — you only claim what you will mutate.
import bpy, bmesh, math, os, json, random, urllib.request, struct, sys
from mathutils import Vector, Matrix
from pathlib import Path
from math import sin, cos, pi
ROOT=Path(__file__).resolve().parent
os.chdir(ROOT); random.seed(55)
bpy.ops.object.select_all(action='SELECT'); bpy.ops.object.delete(use_global=False)
S=bpy.context.scene
S.render.engine='CYCLES'; S.cycles.samples=24; S.cycles.use_denoising=True
prefs=bpy.context.preferences.addons['cycles'].preferences
prefs.compute_device_type='OPTIX'; prefs.get_devices()
for d in prefs.devices: d.use=d.type!='CPU'
S.cycles.device='GPU'; S.render.image_settings.file_format='PNG'
S.world.color=(.25,.25,.25)
texdir=ROOT/'textures'; texdir.mkdir(exist_ok=True)
bits=[cyl(mgp,.037,.22,'Metal'),box((.5,-.22,2.58),(.15,.42,.14),'Metal',.012),cyl((.5,-.74,2.60),.028,.65,'Metal','Y'),cyl((.5,-1.105,2.60),.043,.10,'Metal','Y'),cyl((.5,-.70,2.535),.018,.44,'Metal','Y'),box((.34,-.22,2.54),(.19,.23,.22),'Metal'),tube([(.43,-.06,2.58),(.40,.13,2.61),(.4,.19,2.54)],.015,'Metal'),tube([(.57,-.06,2.58),(.60,.13,2.61),(.6,.19,2.54)],.015,'Metal'),ring((.5,-.92,2.67),.036,.008,'Metal','Y')]
for y in [-.46-i*.028 for i in range(15)]:bits.append(ring((.5,y,2.60),.029,.006,'Metal','Y',24))
mg=join(bits,'MG',mgp,turret)
for name,pos,par in [('Seat_Commander',(.49,-.12,2.45),turret),('Seat_Driver',(.58,-2.14,1.68),None),('Exhaust',(1.64,2.45,1.47),None),('Light_Head_L',(.99,-2.49,1.56),None),('Light_Head_R',(-.99,-2.49,1.56),None),('Fx_Engine',(0,1.6,1.55),None),('Fx_Ammo',(0,0,.85),None),('Fx_Hatch',(.49,-.12,2.42),turret)]:empty(name,pos,par)
# Sort wheel nodes front to rear (idler is foremost, then 5 roadwheels, then sprocket).
for side in ['L','R']:
 ww=sorted([o for o in wheels if o.name.startswith('Wheel_'+side)],key=lambda o:o.location.y)
 for i,o in enumerate(ww):o.name='tmp_'+side+str(i)
 for i,o in enumerate(ww):o.name='Wheel_'+side+str(i+1)
# Spend geometry on silhouettes; simplify hidden bevel transitions on wheel/tread assemblies.
for o in wheels+tracks:
 bpy.context.view_layer.objects.active=o
 mod=o.modifiers.new('Game geometry budget','DECIMATE');mod.ratio=.60 if o in wheels else .72
 bpy.ops.object.modifier_apply(modifier=mod.name)
healthy=list(bpy.context.scene.objects)
# Ensure parent matrices evaluated before geometry copies.
bpy.context.view_layer.update()
def tri_count(objs):return sum(sum(len(p.vertices)-2 for p in o.data.polygons) for o in objs if o.type=='MESH')
paths=[]
for i,(name,col) in enumerate(PAINTS):
 set_paint(col);p=f'_paint_{i}.png';render(p,640,360,12);paths.append(p)
sheet(paths,'paints.png');set_paint(PAINTS[0][1])
An={o.name:o for o in A};Dn={o.name:o for o in D};statepaths=[]
def reset():hide_group(A,False);hide_group(D,True)
def show(name):
 if name in Dn:Dn[name].hide_render=False
for state in range(6):
 reset()
 if state==1:
  for n in scar_names:show(n)
  chosen=list(twins)[:6]
  for p in chosen:An[p].hide_render=True;show(twins[p])
 if state==2:
  for o in A:
   if o.name.startswith('Part_'):o.hide_render=True
 if state==3:
  An['Track_L'].hide_render=True;show('Track_L_Broken');An['Gun'].hide_render=True;An['Barrel'].hide_render=True;show('Gun_Broken')
 if state>=4:
  hide_group(A,True);show('Wreck_Hull');show('Wreck_Turret')
 if state==5:
  w=Dn['Wreck_Turret'];wm=w.matrix_world.copy();w.rotation_mode='XYZ';w.location=(3.25,.4,.90);w.rotation_euler=(.30,2.50,.4);bpy.context.view_layer.update();w.location.z-=min((w.matrix_world@Vector(c)).z for c in w.bound_box)
 p=f'_state_{state}.png';render(p,640,360,16);statepaths.append(p)
 if state==5:w.matrix_world=wm
sheet(statepaths,'states.png')
reset()
# Keep user-facing directory concise: intermediate frame tiles are disposable.
for p in paths+statepaths:(ROOT/p).unlink(missing_ok=True)
(ROOT/'NOTES.md').write_text('\n'.join([
'T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.',
f"Triangles: healthy {meta['triangles']['healthy']:,}; damage {meta['triangles']['damage']:,}; wreck {meta['triangles']['wreck']:,}.",
'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.',
'Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.',
'Poly Haven CC0 IDs: '+', '.join(IDS)+'; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.',
'Reference differences: five road wheels follow the written brief; MG and antenna extend beyond the 2.40 m turret-height envelope; no insignia.'])+'\n')
print('DONE',json.dumps(meta['triangles']),flush=True)

hook: PreToolUse
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hook: PreToolUse
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hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log'
rg -n 'coord ' /home/claude-agent/AGENTS.md | tail -10
ls -la | head -18" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 587ms:
216:  If unsure whose it is, leave it and `coord note` it.
233:1. `coord check <host:path>` — is anyone else on it? (exit 3 = conflict)
234:2. `coord claim <host:path> [--note "..."]` — take it (exclusive; auto-expires, TTL 30m, refreshed by heartbeat).
235:3. Do the work, then `coord release <host:path>` (or `--all`).
236:4. `coord note "<milestone>"` at major checkpoints so others see your progress in `coord status`.
242:- If you're BLOCKED, check `coord status`, coordinate via `coord note`, or wait for release. Override only after confirming with the other session.
245:**Multi-agent claims (2026-09-05):** sibling subagents forked from one session share ONE coord identity (the ancestor-pid walk can't tell them apart) — always claim/release with `--owner <task-tag>` when you're one of several agents on the same session. Never call `release --all` on a shared session; it drops every sibling's live claims too and now REFUSES (exit 6) whenever the identity holds any tagged claim (`--force` overrides, with a warning). Forge-agent workers (`forge_agent.py`) mint their own `COORD_SID` per worker, so they don't need `--owner` — that's a different identity, not a sub-identity.
275:- **Claim before you write.** The coord protocol above (`coord check` /
276:  `coord claim` / `coord release`) is not Claude-specific — it is the shared
282:  share one coord identity (one `COORD_SID`), always claim/release with
total 21636
drwxrwxr-x  3 claude-agent claude-agent    4096 Oct 11 16:54 .
drwxrwxr-x 94 claude-agent claude-agent    4096 Oct 11 15:29 ..
-rw-rw-r--  1 claude-agent claude-agent   11216 Oct 11 16:11 PROMPT.txt
drwxrwxr-x  2 claude-agent claude-agent    4096 Oct 11 16:54 __pycache__
-rw-rw-r--  1 claude-agent claude-agent  383951 Oct 11 16:55 astra.log
-rw-rw-r--  1 claude-agent claude-agent   47121 Oct 11 16:54 build_t55-tank.py
-rw-r--r--  1 claude-agent claude-agent 1813732 Oct 11 16:38 clay.png
-rw-r--r--  1 claude-agent claude-agent 2057130 Oct 11 16:38 final.png
-rw-rw-r--  1 claude-agent claude-agent    8923 Oct 11 15:20 job.json
-rw-r--r--  1 claude-agent claude-agent   17626 Oct 11 16:38 nodes.json
-rw-r--r--  1 claude-agent claude-agent  951346 Oct 11 16:38 pivots.png
-rw-rw-r--  1 claude-agent claude-agent  680596 Oct 11 15:22 sheet.jpg
-rw-rw-r--  1 claude-agent claude-agent      43 Oct 11 15:22 sheet.log
-rw-rw-r--  1 claude-agent claude-agent     951 Oct 11 15:20 sheet_prompt.txt
-rw-r--r--  1 claude-agent claude-agent 1868363 Oct 11 16:38 side.png
-rw-rw-r--  1 claude-agent claude-agent      21 Oct 11 16:11 started.txt
-rw-r--r--  1 claude-agent claude-agent 5781316 Oct 11 16:38 t55-tank-damage.glb

hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
hook: PreToolUse Completed
exec
/bin/bash -lc 'coord status' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
=== sessions ===
  [alive] 1153004:1717757612  Claude Code session  ()
  [alive] 1208112:1658530799  Claude Code session  ()
  [alive] 1335028:1631140493  Claude Code session  ()
  [alive] 1558502:1617678053  Claude Code session  ()
  [alive] 1561985:1718503986  Claude Code session  ()
  [alive] 162504:1727381278  Claude Code session  ()
  [alive] 18278:1714399856  Claude Code session  ()
  [alive] 2055176:1719266109  Claude Code session  ()
  [alive] 223906:1684030292  Claude Code session  ()
  [alive] 2314503:1565741435  Claude Code session  ()
  [alive] 3169652:1651719239  Claude Code session  ()
  [alive] 4013783:1625028676  Claude Code session  ()
  [alive] 4056350:1625091145  Claude Code session  ()
  [alive] 4146838:1714203358  Claude Code session  ()
  [alive] 4153283:1714217907  Claude Code session  ()
  [alive] 423987:1627206825  Claude Code session  ()
  [alive] 440828:1627296141  Claude Code session  ()
  [alive] 89945:1625518888  Claude Code session  ()
  [alive] claude-sonnet-2728807:1441793758  Claude Code session  ()
  [alive] claude-sonnet-4001920:1625012046  Claude Code session  ()
  [alive] claude-sonnet-4022476:1625038977  Claude Code session  ()
  [alive] codex-gpt-5.6-sol-3529165:1409276146  You are working in a git worktree of the forge-monorepo, branched from p2/codex-adapter. This repo is a WORKBENCH MIRROR of the real ax42 Engine host tree — you will NOT deploy, SSH anywhere, or touch  ()
  [alive] codex-gpt-6-astra-3677556:1557057246  You are the Astra AUTHOR seat of Forge's designated composite 3D recipe (V4.6 freezes Astra pen + DeepSeek exact-edit tail; NOT Engine tenant composite-auto). Build original convincing first-person ta  ()
  [alive] codex-gpt-6-astra-3884657:1557574497  You are the Astra author seat of user-requested COMPOSITE 3D lane. Build ONE Halcyon first-person hands proof with the supplied Cransh authored FBX. Work in your isolated worktree; do not deploy. No s  ()
  [alive] codex:gpt-5.6-luna:3296135:1788529417  Run 'sleep 60' in the shell then reply with the word DONE.  ()
  [alive] deepseek-deepseek-flash-1604500:1468734044  Claude Code session  ()
  [alive] deepseek-deepseek-flash-2206615:1518663408  Claude Code session  ()
  [alive] deepseek-deepseek-flash-3478594:1476172879  Claude Code session  ()
  [alive] deepseek-deepseek-flash-3574350:1476435900  Claude Code session  ()
  [alive] gemini-proxy-forge-build-gemini-38flash-3153991:1506259864  You are the pass 2 adversarial reviewer of an engineering blueprint (revised after pass 1). Context: OhMyUnicorn Forge builds and deploys web apps for regular users from a brief through an AI pipeline  ()
  [alive] gemini-proxy-forge-build-gemini-38flash-3168945:1506321383  You are the pass 2 adversarial reviewer of an engineering blueprint (revised after pass 1). Context: OhMyUnicorn Forge builds and deploys web apps for regular users from a brief through an AI pipeline  ()
  [alive] unreal-gpt-6-astra-2421694:1608656741  You are worker WM on MÖBELKRIG, Forge's flat-pack furniture store FPS (three.js, no build step). The end boss STORKUND is a 9 m furniture golem. In your worktree read briefs-rework/WM-model.md and do   ()
  [alive] unreal-gpt-6-astra-720574:1728969234  You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ=  ()
  [alive] unreal-gpt-6-astra-780957:1729117182  You are W-CREATURES (round 2) of the RUTH teaser film. In your worktree read briefs/COMMON.md, briefs/W-CREATURES.md, then briefs/W-CREATURES-R2.md and do what R2 says (it overrides). README.md within  ()
  [alive] unreal-gpt-6.1-sol-2862176:1708978510  You are W-GRASS7. Repo forge-assets (your worktree). The settlement renderer (omg/kit/building/settlement-render.mjs, the
page browse/settlement.html, its copy browse/building/) draws villages, towns   ()
=== claims ===
  ax42:/home/claude-agent/forge-monorepo/apps/forge-engine/substrate/blocks/ascii-art/ [exclusive] by 1153004:1717757612 held 40s exp 1759s :: Claude Code session
  gex44:/root/fal-author/a7v-tank-v1/ [exclusive] by 704042:1728923997 held 2126s exp 1724s :: 
  gex44:/root/fal-author/char-b1-tank-v1/ [exclusive] by 711738:1728945550 held 1903s exp 3496s :: 
  gex44:/root/fal-author/chi-ha-tank-v1/ [exclusive] by 722442:1728973623 held 1641s exp 1033s :: 
  gex44:/root/fal-author/k2-tank-v1/ [exclusive] by 719957:1728967685 held 1691s exp 1440s :: 
  gex44:/root/fal-author/t14-armata-tank-v1/ [exclusive] by 728651:1728992275 held 1443s exp 3421s :: 
  gex44:/root/fal-author/t55-tank-v1/ [exclusive] by 677311:1728875904 held 2600s exp 2799s :: 
  gex44:/root/fal-author/type99-tank-v1/ [exclusive] by 690621:1728889436 held 2448s exp 4751s :: 
  gex44:/root/ruth-teaser-20261011/creatures/ [exclusive] by unreal-gpt-6-astra-780957:1729117182 held 195s exp 1757s :: You are W-CREATURES (round 2) of the RUTH teaser film. In your worktree read briefs/COMMON.md, briefs/W-CREATURES.md, then briefs/W-CREATURES-R2.md and do what R2 says (it overrides). README.md within
  gex44:/root/ruth-teaser-20261011/director/ [exclusive] by unreal-gpt-6-astra-720574:1728969234 held 1675s exp 1778s :: You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ=
  local:/home/claude-agent/forge-build/forge-assets/jobs/a7v-tank-v1/ [exclusive] by 704042:1728923997 held 2126s exp 1724s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/char-b1-tank-v1/ [exclusive] by 711738:1728945550 held 1903s exp 3496s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/chi-ha-tank-v1/ [exclusive] by 722442:1728973623 held 1641s exp 1033s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/k2-tank-v1/ [exclusive] by 719957:1728967685 held 1691s exp 1440s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/t14-armata-tank-v1/ [exclusive] by 728651:1728992275 held 1443s exp 3421s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/ [exclusive] by 677311:1728875904 held 2600s exp 2799s :: 
  local:/home/claude-agent/forge-build/forge-assets/jobs/type99-tank-v1/ [exclusive] by 690621:1728889436 held 2448s exp 4751s :: 
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/.forge-worktrees/1791736017-be5ed7/ [exclusive] by unreal-gpt-6-astra-720574:1728969234 held 1702s exp 1778s :: You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ= owner=1791736017-be5ed7
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/.forge-worktrees/1791737497-2ffd76/ [exclusive] by unreal-gpt-6-astra-780957:1729117182 held 223s exp 1757s :: You are W-CREATURES (round 2) of the RUTH teaser film. In your worktree read briefs/COMMON.md, briefs/W-CREATURES.md, then briefs/W-CREATURES-R2.md and do what R2 says (it overrides). README.md within owner=1791737497-2ffd76
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/creatures-out/ [exclusive] by unreal-gpt-6-astra-780957:1729117182 held 195s exp 1757s :: You are W-CREATURES (round 2) of the RUTH teaser film. In your worktree read briefs/COMMON.md, briefs/W-CREATURES.md, then briefs/W-CREATURES-R2.md and do what R2 says (it overrides). README.md within
  local:/home/claude-agent/forge-build/ruth-teaser-20261011/director-out/ [exclusive] by unreal-gpt-6-astra-720574:1728969234 held 1675s exp 1778s :: You are W-DIRECTOR (phase 1) of the RUTH teaser film. In your worktree read briefs/COMMON.md and then briefs/W-DIRECTOR-P1.md and do exactly what they say. Hard stop 19:10 CET (read the clock with TZ=
  local:/tmp/char-b1-runtime/ [exclusive] by 711738:1728945550 held 278s exp 3321s :: 
=== recent milestones ===

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/bin/bash -lc "python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py /tmp/t55-rev2/t55-tank.glb --strict > /tmp/t55-audit2.json
python3 - <<'PY'
import json
j=json.load(open('/tmp/t55-audit2.json'));print(str(j)[-2500:])
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 123ms:
': 472, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.148', 'primitive': 3, 'triangles': 382, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.162', 'primitive': 0, 'triangles': 792, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.162', 'primitive': 1, 'triangles': 2910, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.162', 'primitive': 2, 'triangles': 472, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.162', 'primitive': 3, 'triangles': 382, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.179', 'primitive': 0, 'triangles': 714, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.179', 'primitive': 1, 'triangles': 176, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}, {'mesh': 'Cylinder.179', 'primitive': 2, 'triangles': 966, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0}], 'duplicate_primitives': [{'primitive': 'Cube.893[1]', 'same_as': 'Cube.906[1]'}, {'primitive': 'Cube.857[0]', 'same_as': 'Cube.874[0]'}, {'primitive': 'Cube.862[0]', 'same_as': 'Cube.879[0]'}, {'primitive': 'Cube.867[0]', 'same_as': 'Cube.884[0]'}, {'primitive': 'Cube.929[0]', 'same_as': 'Cube.927[0]'}, {'primitive': 'Cube.929[1]', 'same_as': 'Cube.927[1]'}, {'primitive': 'Cylinder.044[0]', 'same_as': 'Cylinder.030[0]'}, {'primitive': 'Cylinder.044[2]', 'same_as': 'Cylinder.030[2]'}, {'primitive': 'Cylinder.058[2]', 'same_as': 'Cylinder.030[2]'}, {'primitive': 'Cylinder.072[2]', 'same_as': 'Cylinder.030[2]'}, {'primitive': 'Cylinder.086[0]', 'same_as': 'Cylinder.030[0]'}, {'primitive': 'Cylinder.086[2]', 'same_as': 'Cylinder.030[2]'}, {'primitive': 'Cylinder.120[0]', 'same_as': 'Cylinder.106[0]'}, {'primitive': 'Cylinder.120[2]', 'same_as': 'Cylinder.106[2]'}, {'primitive': 'Cylinder.134[2]', 'same_as': 'Cylinder.106[2]'}, {'primitive': 'Cylinder.148[2]', 'same_as': 'Cylinder.106[2]'}, {'primitive': 'Cylinder.162[0]', 'same_as': 'Cylinder.106[0]'}, {'primitive': 'Cylinder.162[2]', 'same_as': 'Cylinder.106[2]'}], 'note': 'Mesh-local counts, before node transforms/instances. Degenerate threshold: cross-product magnitude < 1e-12 in asset units squared. Not a source-topology or visual-quality verdict.', 'triangles': 144860, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0, 'findings': ['duplicate_primitives']}

codex
The final clean build is queued on the GPU machine. The export audit found no degenerate triangles or nonfinite geometry in the previous pass; I’ll check the new files’ budgets, pivots, damage swaps, and renders when this build finishes.

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/bin/bash -lc "ssh gex44 'tail -5 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 575ms:
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/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 473ms:
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/bin/bash -lc "ssh gex44 'ps -eo pid,etime,args | grep -E \"blender.*python|gpu_gate\" | head -15'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 504ms:
1488923       04:07 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/chi-ha-tank-v1/build_chi-ha-tank.py
1497589       02:06 bash -c mv /root/ruth-teaser-20261011/director/previz /root/ruth-teaser-20261011/director/rejected_previz; mv /root/ruth-teaser-20261011/director/timings.jsonl /root/ruth-teaser-20261011/director/timings_rejected.jsonl; /root/ruth-teaser-20261011/blender.sh -b --factory-startup --python-exit-code 1 --python /root/ruth-teaser-20261011/director/build_director.py > /root/ruth-teaser-20261011/director/build.log 2>&1 && /root/ruth-teaser-20261011/blender.sh -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/audit_director.py --python /root/ruth-teaser-20261011/director/render_director.py -- style > /root/ruth-teaser-20261011/director/style.log 2>&1 && /root/ruth-teaser-20261011/blender.sh -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/render_director.py -- previz 1 333 > /root/ruth-teaser-20261011/director/previz_001.log 2>&1; tail -8 /root/ruth-teaser-20261011/director/previz_001.log
1498637       01:53 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1498638       01:53 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1502251       01:17 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/type99-tank-v1/build_type99-tank.py > /root/fal-author/type99-tank-v1/build-final.log 2>&1
1502252       01:17 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/type99-tank-v1/build_type99-tank.py
1504850       00:49 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t14-armata-tank-v1/build_t14-armata-tank.py > /root/fal-author/t14-armata-tank-v1/build.log 2>&1
1504851       00:49 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t14-armata-tank-v1/build_t14-armata-tank.py
1504998       00:45 python3 /opt/gpu-gate/gpu_gate.py --name blender-ruth --need-mib 5000 --priority build --poll 2 --max-concurrent 3 --timeout 1200 -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/render_director.py -- previz 1 333
1505001       00:45 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b /root/ruth-teaser-20261011/director/shots.blend --python-exit-code 1 --python /root/ruth-teaser-20261011/director/render_director.py -- previz 1 333
1507683       00:10 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/char-b1-tank-v1/build_char-b1-tank.py > /root/fal-author/char-b1-tank-v1/build.log 2>&1
1507684       00:10 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/char-b1-tank-v1/build_char-b1-tank.py
1508452       00:00 bash -c ps -eo pid,etime,args | grep -E "blender.*python|gpu_gate" | head -15
1508454       00:00 grep -E blender.*python|gpu_gate

codex
The build is waiting behind other Blender jobs. Its validation renders will load both exported GLBs into an empty scene, so the paint variants and damage states will also test what survives export.

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exec
/bin/bash -lc "sed -n '590,605p' build_t55-tank.py
cat /tmp/t55-verify.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
damage_positions={n['name']:Vector(n['world_position']) for n in meta['damage_nodes']}
for pp in meta['damage']['parts']:
 if pp['twin']:assert (healthy_positions[pp['part']]-damage_positions[pp['twin']]).length<.0001,pp
assert (healthy_positions['Muzzle']-Vector((0,1.94,5.775))).length<.0001
(ROOT/'nodes.json').write_text(json.dumps(meta,indent=2))
# Verify and render solely re-imported GLBs from an empty scene.
bpy.ops.object.select_all(action='SELECT');bpy.ops.object.delete(use_global=False)
for material in list(bpy.data.materials):bpy.data.materials.remove(material)
for ng in list(bpy.data.node_groups):
 if ng.name.startswith('glTF Material Output'):bpy.data.node_groups.remove(ng)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank.glb'));A=list(S.objects)
bpy.ops.import_scene.gltf(filepath=str(ROOT/'t55-tank-damage.glb'));D=[o for o in S.objects if o not in A]
# Blender may suffix the second Paint material; imports faithfully carry the same factor.
def hide_group(objs,hide):
 for o in objs:o.hide_render=hide
hide_group(D,True)
import json,struct,sys,io
from pathlib import Path
from PIL import Image
for arg in sys.argv[1:]:
 p=Path(arg);b=p.read_bytes();l=struct.unpack_from('<I',b,12)[0];g=json.loads(b[20:20+l]);bin=b[28+l:]
 tri=sum(g['accessors'][x['indices']]['count']//3 for m in g['meshes'] for x in m['primitives'])
 print(p.name,'bytes',len(b),'triangles',tri,'materials',[m.get('name') for m in g['materials']])
 names=[n.get('name') for n in g['nodes']];print('nodes',len(names),'parts',sum(x.startswith('Part_') for x in names),'root',[names[i] for i in g['scenes'][g.get('scene',0)]['nodes']])
 sizes=[]
 for im in g.get('images',[]):
  v=g['bufferViews'][im['bufferView']];off=v.get('byteOffset',0);img=Image.open(io.BytesIO(bin[off:off+v['byteLength']]));sizes.append((im.get('name'),img.size))
 print('images',sizes)
 for m in g['materials']:
  if m.get('name')=='Paint':print('paint',m['pbrMetallicRoughness'].get('baseColorFactor'))

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/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 743ms:
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/bin/bash -lc "sed -n '240,287p;337,371p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
  z=.73;bits=[cyl((s*1.33,y,z),.345,.26,'Metal','X',48),cyl((s*1.51,y,z),.25,.038,'Interior','X',40),ring((s*1.55,y,z),.31,.030,'Paint','X'),cyl((s*1.56,y,z),.105,.065,'Paint','X')]
  for k in range(12):
   a=2*pi*k/12;ob=box((s*1.54,y+.222*sin(a),z+.222*cos(a)),(.045,.055,.19),'Paint',.009);ob.rotation_euler[0]=-a;bits.append(ob)
   if ind==7:
    ob=box((s*1.34,y+.36*sin(a),z+.36*cos(a)),(.30,.095,.10),'Metal',.012);ob.rotation_euler[0]=-a;bits.append(ob)
  wheels.append(join(bits,f'Wheel_{side}{ind}',(s*1.32,y,z)))
# Tread path: five-wheel bottom contact and wrap around front/rear idler.
path=[]
for i in range(48):
 t=i/48;path.append((-2.17+4.34*t,.052))
path.append((2.36,.14));path.append((2.99,.405))
for i in range(26):
 a=-pi/3+(5*pi/6)*i/26;path.append((2.79+.39*cos(a),.73+.39*sin(a)))
for i in range(55):
 t=i/55;path.append((2.79-5.58*t,1.12-.065*sin(pi*t)))
for i in range(26):
 a=pi/2+(5*pi/6)*i/26;path.append((-2.79+.39*cos(a),.73+.39*sin(a)))
path.append((-2.36,.14))
# Resample equal distance link pitch.
lens=[0]
for i in range(len(path)):a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);lens.append(lens[-1]+(b-a).length)
def sample(t):
 d=(t%1)*lens[-1]
 for i in range(len(path)):
  if lens[i+1]>=d:
   a=Vector(path[i]);b=Vector(path[(i+1)%len(path)]);p=a.lerp(b,(d-lens[i])/(lens[i+1]-lens[i]));q=(b-a).normalized();return p,q
from mathutils.kdtree import KDTree
track_samples=[sample(j/96) for j in range(96)]
track_kd=KDTree(96)
for j,(p,q) in enumerate(track_samples):track_kd.insert((p[0],p[1],0),j)
track_kd.balance()
tracks=[]
for s,side in [(1,'L'),(-1,'R')]:
 bits=[]
 for i in range(96):
  p,q=sample(i/96);y,z=p;ang=math.atan2(q[1],q[0]);x=s*1.321
  ob=box((x,y,z),(.59,.141,.054),'TrackSteel',.008);ob.rotation_euler[0]=ang;bits.append(ob)
  normal=Vector((-q[1],q[0]))
  for off in [-.18,.18]:
   ob=box((x+off,y-normal[0]*.035,z-normal[1]*.035),(.20,.045,.023),'TrackSteel',.005);ob.rotation_euler[0]=ang;bits.append(ob)
  # Center guide horn faces inwards.
  ob=box((x,y+normal[0]*.046,z+normal[1]*.046),(.045,.065,.07),'Metal',.01);ob.rotation_euler[0]=ang;bits.append(ob)
  bits += [cyl((x+s*.30,y,z),.023,.028,'Metal','X',8)]
 tr=join(bits,'Track_'+side)
 uv=tr.data.uv_layers.active
 # V increases monotonically along nearest track-loop station; width is U.
 for f in tr.data.polygons:
  for li in f.loop_indices:
# Tow cable laid across frontal glacis, loop eyes at the ends.
part('TowCable',[tube([(-.90,-2.83,1.28),(-1.1,-2.64,1.4),(-.98,-2.39,1.5),(-.4,-2.3,1.51),(.35,-2.3,1.51),(.94,-2.45,1.43),(1.02,-2.74,1.32)],.021,'Metal'),ring((-.88,-2.88,1.28),.068,.02,'Metal'),ring((1.0,-2.83,1.28),.068,.02,'Metal')])
part('Tools',[tube([(1.4,-.72,1.66),(1.4,.55,1.66)],.02,'Wood'),box((1.4,.65,1.65),(.23,.29,.042),'Metal',.04),tube([(1.52,-.67,1.66),(1.52,.4,1.66)],.018,'Metal')])
part('SpareLinks',[box((x,-3.08,1.10),(.32,.09,.23),'TrackSteel',.01) for x in [-.5,-.16,.18,.52]])
# Hatches with dark cupped wells, raised coamings and hinge pins.
for name,pos,r,parent in [('Commander',(.49,-.12,2.35),.295,turret),('Loader',(-.47,-.05,2.33),.29,turret),('Driver',(.58,-2.14,1.48),.245,None)]:
 x,y,z=pos
 # True recessed crew hatch aperture with a dark closed well below the hinge.
 base=turret if parent else hull
 cutter=cyl((x,y,z+.08),r*.86,.48,'Interior',verts=48);apply(cutter)
 bpy.context.view_layer.objects.active=base
 mod=base.modifiers.new('Crew hatch opening','BOOLEAN');mod.operation='DIFFERENCE';mod.solver='EXACT';mod.object=cutter
 bpy.ops.object.modifier_apply(modifier=mod.name);bpy.data.objects.remove(cutter,do_unlink=True)
 # visible coaming encloses a dark cup with its floor below the armoured deck.
 well=join([cyl((x,y,z-.16),r*.86,.035,'Interior'),ring((x,y,z),r,.022,'Paint')],name+'_well',pos,parent)
 if parent:turretbits=None
 else:hull=join([hull,well],'Hull')
 if parent:
  # merge well into turret without disturbing pivot or existing children
  children=list(turret.children); mats=[(c,c.matrix_world.copy()) for c in children if c != well]
  turret=join([turret,well],'Turret',T)
  for c,wm in mats:c.parent=turret;c.matrix_world=wm
 bits=[cyl((x,y,z+.025),r,.045,'Paint',verts=48),tube([(x-.07,y,z+.064),(x-.07,y+.045,z+.105),(x+.07,y+.045,z+.105),(x+.07,y,z+.064)],.012),cyl((x,y+.9*r,z+.018),.032,r*1.3,'Metal','X')]
 h=join(bits,'Hatch_'+name,(x,y+.9*r,z+.018),parent);hatches.append(h)
 if name=='Commander':
  part('Turret_Cupola',[ring((x,y,z-.015),r+.055,.035),*[bolt((x+(r+.055)*cos(k*pi/8),y+(r+.055)*sin(k*pi/8),z+.012),r=.012) for k in range(16)]],turret)
# IR lamp beside gun, periscopes and antenna.
part('Turret_IRSearchlight',[cyl((.66,-1.2,2.22),.175,.17,'Paint','Y',48),cyl((.66,-1.291,2.22),.147,.012,'Lamps','Y',48),ring((.66,-1.30,2.22),.165,.014,'Metal','Y'),box((.66,-1.15,2.04),(.12,.10,.16))],turret)
for side,x in [('L',.62),('R',-.62)]:
 part('Turret_Sight_'+side,[box((x,-.55,2.34),(.22,.18,.14),'Paint',.025),box((x,-.651,2.35),(.15,.012,.053),'Lamps',.007)],turret)
part('Turret_Antenna',[cyl((-.82,.40,2.18),.065,.10,'Rubber'),tube([(-.82,.40,2.22),(-.82,.40,3.10)],.006,'Metal')],turret)
# DShK receiver, finned barrel, gas tube, spade grips, ammo box, articulated pintle.
mgp=(.50,-.1,2.40)
bits=[cyl(mgp,.037,.22,'Metal'),box((.5,-.22,2.58),(.15,.42,.14),'Metal',.012),cyl((.5,-.74,2.60),.028,.65,'Metal','Y'),cyl((.5,-1.105,2.60),.043,.10,'Metal','Y'),cyl((.5,-.70,2.535),.018,.44,'Metal','Y'),box((.34,-.22,2.54),(.19,.23,.22),'Metal'),tube([(.43,-.06,2.58),(.40,.13,2.61),(.4,.19,2.54)],.015,'Metal'),tube([(.57,-.06,2.58),(.60,.13,2.61),(.6,.19,2.54)],.015,'Metal'),ring((.5,-.92,2.67),.036,.008,'Metal','Y')]
for y in [-.46-i*.028 for i in range(15)]:bits.append(ring((.5,y,2.60),.029,.006,'Metal','Y',24))

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codex
The rig and metadata checks cover the required parent chain, muzzle and effect sockets, front-to-back wheel numbering, matching damage-part origins, and the four damage roots. I’m also checking the reopened hatches and detached turret in the rendered proof.

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/bin/bash -lc "ssh gex44 'tail -6 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 584ms:
Info: Baking map saved to internal image, save it externally or pack it
BAKED Burnt
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Scars

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/bin/bash -lc "sed -n '286,299p' build_t55-tank.py
python3 - <<'PY'
from pathlib import Path
p=Path('__pycache__/build_t55-tank.cpython-311.pyc')
for p in Path('__pycache__').glob('build_t55-tank.*.pyc'):p.unlink()
if not list(Path('__pycache__').iterdir()):Path('__pycache__').rmdir()
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
 for f in tr.data.polygons:
  for li in f.loop_indices:
   co=tr.data.vertices[tr.data.loops[li].vertex_index].co
   idx=track_kd.find((co.y,co.z,0))[1]
   sp,sq=track_samples[idx]
   vv=idx/96+(Vector((co.y,co.z))-sp).dot(sq)/lens[-1]
   uv.data[li].uv=((co.x-s*1.321)/.59+.5,vv)
 low=min(v.co.z for v in tr.data.vertices)
 for v in tr.data.vertices:v.co.z-=low
 tracks.append(tr)
# Sectioned fenders, rolled lips and pressed ribs. No skirts on the T-55.
for s,side in [(1,'L'),(-1,'R')]:
 for end,ya,yb in [('F',-2.76,-.05),('R',-.02,2.76)]:
  bits=[box((s*1.38,(ya+yb)/2,1.31),(.51,yb-ya,.052),'Paint',.022),tube([(s*1.617,ya,1.30),(s*1.617,yb,1.30)],.018)]

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/bin/bash -lc "ssh gex44 'tail -7 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 569ms:
18:59:50 | INFO: Blender create Mesh node impact.028
18:59:50 | INFO: Blender create Mesh node armoured monocoque.001
18:59:50 | INFO: Blender create Mesh node cast turret.001
18:59:50 | INFO: glTF import finished in 0.33s
/root/fal-author/t55-tank-v1/build_t55-tank.py:609: DeprecationWarning: 'World.use_nodes' is expected to be removed in Blender 6.0
  world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.75,.78,.78,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
01:31.573  render           | Saved: '/root/fal-author/t55-tank-v1/final.png'

codex
Both GLBs have exported and re-imported successfully. The final renders are now being generated; next I’ll inspect the damage sheet and the 30-degree joint test for misplaced or detached geometry.

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/bin/bash -lc 'mkdir -p /tmp/t55-rev3
scp gex44:/root/fal-author/t55-tank-v1/final.png gex44:/root/fal-author/t55-tank-v1/nodes.json /tmp/t55-rev3/' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "python3 - <<'PY'
import json
j=json.load(open('/tmp/t55-rev3/nodes.json'));print(j['triangles'])
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
{'healthy': 147376, 'damage': 91045, 'wreck': 40373}

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/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log'
scp gex44:/root/fal-author/t55-tank-v1/states.png gex44:/root/fal-author/t55-tank-v1/pivots.png /tmp/t55-rev3/" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 3101ms:
  clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8
01:58.177  render           | Saved: '/root/fal-author/t55-tank-v1/clay.png'
02:04.007  render           | Saved: '/root/fal-author/t55-tank-v1/pivots.png'
02:06.133  render           | Saved: '/root/fal-author/t55-tank-v1/_paint_0.png'

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codex
The joint test now visibly rotates the turret and gun and opens the hatches while keeping them attached. The revised wheels pushed the healthy mesh to 147k triangles, so I’m reducing wheel and track detail to bring it below the 140k limit.

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text();mark=\"healthy=list(bpy.context.scene.objects)\"
s=s.replace(mark,\"\"\"# Enforce the healthy game budget after boolean windows and bevels have resolved.
def mesh_tri(o):return sum(len(p.vertices)-2 for p in o.data.polygons) if o.type=='MESH' else 0
budget_total=sum(mesh_tri(o) for o in bpy.context.scene.objects)
if budget_total>138000:
 eligible=wheels+tracks;subtotal=sum(mesh_tri(o) for o in eligible);ratio=max(.1,(136000-(budget_total-subtotal))/subtotal)
 for o in eligible:
  bpy.context.view_layer.objects.active=o;mod=o.modifiers.new('Final measured triangle budget','DECIMATE');mod.ratio=ratio;bpy.ops.object.modifier_apply(modifier=mod.name)
\"\"\"+mark)
s=s.replace(\"ja=export(healthy,'t55-tank.glb')\",\"ja=export(healthy,'t55-tank.glb')\\nassert 80000<=tri_count(healthy)<=140000,tri_count(healthy)\")
p.write_text(s)
PY
ssh gex44 'tail -3 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 606ms:
02:21.455  render           | Saved: '/root/fal-author/t55-tank-v1/_state_1.png'
02:22.794  render           | Saved: '/root/fal-author/t55-tank-v1/_state_2.png'
02:25.110  render           | Saved: '/root/fal-author/t55-tank-v1/_state_3.png'

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/bin/bash -lc "ssh gex44 'tail -3 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 558ms:
DONE {"healthy": 147376, "damage": 91045, "wreck": 40373}

Blender quit

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/bin/bash -lc 'scp gex44:/root/fal-author/t55-tank-v1/states.png gex44:/root/fal-author/t55-tank-v1/side.png gex44:/root/fal-author/t55-tank-v1/paints.png /tmp/t55-rev3/' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "rg -n -C 3 'cap|stop|REVISE' /home/claude-agent/.agents/skills/blender-game-assets/reference/critic-loop.md
ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 568ms:
12-| Seat | Who | Owns |
13-| --- | --- | --- |
14-| Author | Astra (operator law: Blender work goes to Astra) | Geometry, authored materials, UVs, bakes, Blender renders, the export |
15:| Runtime | The root, or one worker when the shader work is real | Loading the export in the game's actual three.js path, captures, measured costs |
16-| Critic | A different model family from the author, reading the real images | Findings only. Never edits the asset |
17-
18:The critic must open the actual capture files. A critic that cannot read images says so and returns
19-BLOCKED; it never writes a visual verdict from metrics or from the author's description.
20-
21-## Budget
22-
23:- Default: **3 revisions, at most 2 critic passes per revision.** The brief may set another cap.
24:- A cap is an execution limit, not acceptance. Cap reached with open visual findings = `REVISE`
25-  reported as such, never a `PASS`.
26:- No unattended improvement loop past the cap.
27-
28-## Before the first render
29-
30-Write in the task folder: scope, target cameras (gameplay view, hero, rear, closest required view),
31-output paths, budgets (triangles, exported vertices, texture bytes and GPU memory, draw calls) and
32:the revision cap. Budgets are task inputs; do not copy another asset's numbers.
33-
34-Run the [preflight](preflight-and-recovery.md) once: Blender starts and runs a scene operation, a
35:tiny bake and export round-trips through the real loader, one real runtime frame is captured.
36-
37-Integrate a cheap LOW blockout in the runtime at this stage. Scale, axis, camera and material
38-contract problems are found before an expensive bake, not after.
--
40-## Each revision keeps
41-
42-- the source revision or parameters that rebuild the previous asset;
43:- real hero, rear and close-up captures, same camera, light, exposure and pose every time;
44-- triangles, exported vertices, primitives, material count, file bytes, texture GPU memory;
45-- runtime draw counters, kept apart from offline estimates;
46-- the critic's findings, the fixes chosen, and the next measured result.
47-
48-## The critic pass
49-
50:The critic receives the previous AND the current captures and metrics under matched cameras (or
51-an explicit "first revision, no baseline"), the reference image, and the brief. It returns:
52-
53-- **at most five findings**, ordered by impact, each with a stable id, the evidence path (whole
--
55-  **measurable acceptance condition**;
56-- regressions against the previous revision;
57-- resolved / remaining / regressed status of earlier findings on a follow-up pass;
58:- `PASS`, `REVISE` or `BLOCKED`, with the limits of its evidence.
59-
60-It compares against the reference as well as the previous revision: clean topology and progress
61-since last time do not make the asset match the reference. It separates the observed defect from
--
63-stairs, silhouette edges): it inspects crops at each delivered LOD. Design ideas are suggestions,
64-not new acceptance requirements.
65-
66:When the cause could be the asset or the renderer, it asks for the diagnostic captures in
67-[runtime parity](runtime-parity-and-diagnostics.md) (maps off, AO neutral, lightmap off) rather
68-than guessing.
69-
70:## Rules that stop false passes
71-
72-- A generated concept image is never proof of a working model. Label concepts as concepts; accept
73-  only on real renders of the real export.
74-- Requested bakes need bake provenance (what was baked, from what, at what settings) and matched
75:  runtime captures with each contribution switched off in turn. Vertex tint and runtime shadows
76-  are not substitutes for a requested AO or lightmap bake.
77-- An atlas repair is checked on the full matched views, not only on the crop that was broken: a new
78-  layout can fix one edge and turn another face black.
79-- One writer per handoff file. A reply never gets appended to a request file another agent will
80:  regenerate. Superseded manifests and failed captures stay on disk.
81-- The author hands the root a compact result: verdict, the few decisive images, the metrics table.
82:  Full capture sets stay on disk; the root does not load every image.
83-- A user's rejection or a changed brief reopens any earlier `PASS`.
84-
85-## Lessons

codex
The final review still flags two visual gaps: wear is too uniform, and the impact marks look too much like repeated rings. I’m correcting those within your requested iteration window, alongside the triangle-budget fix.

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/bin/bash -lc "ssh gex44 'ps -eo pid,args | grep \"gpu_gate.py.*python /root/fal-author/t55-tank-v1/build_t55-tank.py\"'
sed -n '100,162p;468,492p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 521ms:
1530979 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1536914 bash -c ps -eo pid,args | grep "gpu_gate.py.*python /root/fal-author/t55-tank-v1/build_t55-tank.py"
1536916 grep gpu_gate.py.*python /root/fal-author/t55-tank-v1/build_t55-tank.py
 mod=o.modifiers.new('Machined edge radius','BEVEL');mod.width=w;mod.segments=seg
 return o
def box(loc,dim,mat='Paint',bev=.012):
 bpy.ops.mesh.primitive_cube_add(size=1,location=loc);o=bpy.context.object;o.dimensions=dim
 bpy.ops.object.transform_apply(location=False,rotation=False,scale=True)
 if bev:bevel(o,bev,3 if bev>=.05 else 1)
 return matobj(o,mat)
def cyl(loc,r,depth,mat='Paint',axis='Z',verts=32,r2=None):
 if r2 is None:bpy.ops.mesh.primitive_cylinder_add(vertices=verts,radius=r,depth=depth,location=loc)
 else:bpy.ops.mesh.primitive_cone_add(vertices=verts,radius1=r,radius2=r2,depth=depth,location=loc)
 o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 bevel(o,.005,1);matobj(o,mat)
 for f in o.data.polygons:f.use_smooth=len(f.vertices)==4
 return o
def uvball(loc,scale,mat='Paint',seg=32,rings=16):
 bpy.ops.mesh.primitive_uv_sphere_add(segments=seg,ring_count=rings,radius=1,location=loc);o=bpy.context.object;o.scale=scale
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def mesh(name,vs,fs,mat='Paint',smooth=False):
 me=bpy.data.meshes.new(name);me.from_pydata(vs,[],fs);me.update();o=bpy.data.objects.new(name,me);bpy.context.collection.objects.link(o);matobj(o,mat)
 for f in me.polygons:f.use_smooth=smooth
 return o
def tube(points,r=.012,mat='Paint',n=8):
 cu=bpy.data.curves.new('formed tube','CURVE');cu.dimensions='3D';cu.resolution_u=1;cu.bevel_depth=r;cu.bevel_resolution=1;cu.resolution_u=1
 sp=cu.splines.new('POLY');sp.points.add(len(points)-1)
 for v,p in zip(sp.points,points):v.co=(*p,1)
 o=bpy.data.objects.new('tube',cu);bpy.context.collection.objects.link(o);o.data.materials.append(M[mat]);bpy.context.view_layer.objects.active=o;o.select_set(True);bpy.ops.object.convert(target='MESH');o.select_set(False);return o
def ring(loc,r,minor=.014,mat='Paint',axis='Z',seg=48):
 bpy.ops.mesh.primitive_torus_add(major_segments=seg,minor_segments=6,location=loc,major_radius=r,minor_radius=minor);o=bpy.context.object
 if axis=='X':o.rotation_euler[1]=pi/2
 if axis=='Y':o.rotation_euler[0]=pi/2
 for f in o.data.polygons:f.use_smooth=True
 return matobj(o,mat)
def bolt(loc,axis='Z',r=.018,mat='Metal'):return cyl(loc,r,.014,mat,axis,6)
def join(objs,name,pivot=(0,0,0),parent=None):
 objs=[o for o in objs if o]
 bpy.ops.object.select_all(action='DESELECT')
 for o in objs:apply(o)
 for o in objs:o.select_set(True)
 bpy.context.view_layer.objects.active=objs[0];bpy.ops.object.join();o=bpy.context.object;o.name=name
 # Move mesh to desired pivot while retaining world coordinates.
 wm=o.matrix_world.copy(); inv=Matrix.Translation(Vector(pivot)).inverted()
 o.data.transform(inv@wm);o.matrix_world=Matrix.Translation(Vector(pivot))
 # World-scale planar UVs on each face, preserving existing UVs is not needed except track override below.
 for old_uv in list(o.data.uv_layers):o.data.uv_layers.remove(old_uv)
 uv=o.data.uv_layers.new(name='UVMap');uv.active_render=True
 for f in o.data.polygons:
  no=f.normal;ax=max(range(3),key=lambda i:abs(no[i]));ij=[i for i in range(3) if i!=ax]
  for li in f.loop_indices:
   co=o.data.vertices[o.data.loops[li].vertex_index].co+Vector(pivot);uv.data[li].uv=(co[ij[0]]*.75,co[ij[1]]*.75)
 if parent:wm=o.matrix_world.copy();o.parent=parent;o.matrix_world=wm
 o.select_set(False);return o
def empty(name,pos,parent=None):
 o=bpy.data.objects.new(name,None);bpy.context.collection.objects.link(o);o.matrix_world=Matrix.Translation(Vector(pos))
 if parent:o.parent=parent;o.matrix_world=Matrix.Translation(Vector(pos))
 return o
parts=[];wheels=[];hatches=[]
def part(name,objs,parent=None):
 # Surface-volume centroid approximation defines throwable item's independent origin.
 bpy.context.view_layer.update();corners=[o.matrix_world@Vector(v) for o in objs for v in o.bound_box]
 cen=Vector(tuple((min(v[i] for v in corners)+max(v[i] for v in corners))*.5 for i in range(3)))
   a=k*2*pi/20;rr2=rr*(1+.13*sin(k*7.13));h=heights[j]+(.013*(k%2) if penetration and j==2 else 0)
   point=Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),0))
   if project:
    point,pn=project(point);point+=pn*h
   else:point+=n*h
   v.append(tuple(point))
 for j in range(4):
  for k in range(20):f.append((j*20+k,j*20+(k+1)%20,(j+1)*20+(k+1)%20,(j+1)*20+k))
 o=mesh('impact',v,f,'Scars');o.data.materials.append(M['Burnt'])
 for p in o.data.polygons:p.material_index=1 if p.index//20 in [0,3] else 0
 # ricochet furrow raised only millimetres from plate
 a=Vector(center)+q@Vector((r*.9,.01,.004));b=Vector(center)+q@Vector((r*2.5,.025,.004))
 return [o,tube([a,b],.004,'Scars')]
scar_names=[]
for face in ['Front','L','R','Rear']:
 bits=[]
 for i in range(4):
  if face=='Front':
   x=-.7+i*.43;y=-2.70+.05*sin(i);z=1.20+(y+3.12)*(.28/.88);c=(x,y,z);normal=(0,-.304,.953)
  elif face=='Rear':
   zz=.72+.10*sin(i);c=(-.72+i*.46,3.1+(zz-.43)/.72*.125,zz);normal=(0,1,-.174)
  else:
   s=1 if face=='L' else -1;c=(s*(1.04+(1.20-.43)/1.05*.33),-1.8+i*1.1,1.20);normal=(s,0,-.314)
  bits+=impact(c,normal,.065 if i else .09,i==0)
 o=join(bits,'Scar_Hull_'+face);parent_world(o,HD);damage.append(o);scar_names.append(o.name)

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sed -n '460,474p;90,101p' build_t55-tank.py" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 143 in 79834ms:
Terminated

 succeeded in 492ms:
S.cycles.samples=24

# Geometry created in Z-up: front is -Y, tank left +X. Mesh origins are set without applying moving-node transforms.
def matobj(o,mat):o.data.materials.append(M[mat]);return o
def apply(o):
 bpy.context.view_layer.objects.active=o;o.select_set(True)
 for mod in list(o.modifiers):bpy.ops.object.modifier_apply(modifier=mod.name)
 bpy.ops.object.transform_apply(location=False,rotation=True,scale=True);o.select_set(False)
 return o
def bevel(o,w=.012,seg=1):
 mod=o.modifiers.new('Machined edge radius','BEVEL');mod.width=w;mod.segments=seg
 return o
  parent_world(d,TD if p.name.startswith('Part_Turret') else HD);damage.append(d);twins[p.name]=d.name
# Low-profile impact dishes on actual armour planes, including a raised petalled penetration lip.
def impact(center,normal,r=.082,penetration=False,project=None):
 n=Vector(normal).normalized();q=Vector((0,0,1)).rotation_difference(n);v=[];f=[]
 # flat outer soot rim, scraped silver rim, dark inward-facing crater floor
 radii=[r*1.9,r*1.16,r*.83,r*.48,0.001];heights=[.0023,.003,.012 if penetration else .004,.003,.003]
 for j,rr in enumerate(radii):
  for k in range(20):
   a=k*2*pi/20;rr2=rr*(1+.13*sin(k*7.13));h=heights[j]+(.013*(k%2) if penetration and j==2 else 0)
   point=Vector(center)+q@Vector((rr2*cos(a),rr2*sin(a),0))
   if project:
    point,pn=project(point);point+=pn*h
   else:point+=n*h
   v.append(tuple(point))
 for j in range(4):

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/bin/bash -lc "cat > /tmp/t55-final-polish.py <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text()
s=s.replace(\"('TrackSteel','rusty_metal',(.15,.10,.065)\",\"('TrackSteel','rusty_metal',(.075,.063,.046)\")
s=s.replace(\"default_value=.22 if name=='Paint' else (0 if name=='Burnt' else .2)\",\"default_value=.09 if name=='Paint' else (0 if name=='Burnt' else .2)\")
s=s.replace(\"weather.inputs[0].default_value=.45 if name=='Paint' else .72\",\"weather.inputs[0].default_value=.56 if name=='Paint' else .72\")
s=s.replace(\"for mod in list(o.modifiers):bpy.ops.object.modifier_apply(modifier=mod.name)\",\"\"\"for mod in list(o.modifiers):
  before=len(o.data.polygons) if o.type=='MESH' else 0;edgewear=mod.type=='BEVEL' and any(m and m.name=='Paint' for m in o.data.materials)
  bpy.ops.object.modifier_apply(modifier=mod.name)
  if edgewear:
   indices=[i for i,m in enumerate(o.data.materials) if m==M['Scars']]
   if not indices:o.data.materials.append(M['Scars']);indices=[len(o.data.materials)-1]
   for poly in o.data.polygons:
    if poly.index>=before and poly.area<.05 and random.random()<.24:poly.material_index=indices[0]
\"\"\")
s=s.replace(\"radii=[r*1.9,r*1.16,r*.83,r*.48,0.001];heights=[.0023,.003,.012 if penetration else .004,.003,.003]\",\"radii=[r*1.5,r*.95,r*.70,r*.44,0.001];heights=[.0023,.003,.004,.003,.003]\\n phase=random.random()*6.28\")
s=s.replace(\"rr2=rr*(1+.13*sin(k*7.13));h=heights[j]+(.013*(k%2) if penetration and j==2 else 0)\",\"rr2=rr*(1+.30*sin(k*7.13+phase)+.15*cos(k*2.71+phase+j*.8));h=heights[j]\")
s=s.replace(\"for p in o.data.polygons:p.material_index=1 if p.index//20 in [0,3] else 0\",\"for p in o.data.polygons:p.material_index=0 if p.index//20==2 and (p.index%20)%5 in [0,1] else 1\")
s=s.replace(\"a=Vector(center)+q@Vector((r*.9,.01,.004));b=Vector(center)+q@Vector((r*2.5,.025,.004))\",\"a=Vector(center)+q@Vector((r*.5,.01,.004));b=Vector(center)+q@Vector((r*(1.3+random.random()),.025,.004))\")
s=s.replace(\"'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.'\",\"'Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior, Scars; damage uses Paint, Burnt, Scars, TrackSteel, Rubber.'\")
s=s.replace(\"'Reference differences: five road wheels follow the written brief; MG and antenna extend beyond the 2.40 m turret-height envelope; no insignia.'\",\"'Reference differences: simplified cast-surface variation and battle weathering; five road wheels follow the written brief; MG and antenna exceed the 2.40 m turret envelope.'\")
p.write_text(s)
compile(s,str(p),'exec')
PY
python3 /tmp/t55-final-polish.py
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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 succeeded in 574ms:
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codex
The last changes add chipped wear to bevelled edges, darken the tracks, reduce uniform paint streaking, and break up the impact outlines. The clean rebuild is queued; I’ll verify its files and leave any remaining visual limitations documented.

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/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log'
ls /tmp/t55-rev3" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 573ms:
02:24.282  render           | Saved: '/root/fal-author/t55-tank-v1/_state_5.png'
DONE {"healthy": 134020, "damage": 83945, "wreck": 36561}

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final.png
nodes.json
paints.png
pivots.png
side.png
states.png

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/bin/bash -lc 'scp gex44:/root/fal-author/t55-tank-v1/t55-tank.glb gex44:/root/fal-author/t55-tank-v1/t55-tank-damage.glb gex44:/root/fal-author/t55-tank-v1/final.png gex44:/root/fal-author/t55-tank-v1/side.png gex44:/root/fal-author/t55-tank-v1/clay.png gex44:/root/fal-author/t55-tank-v1/paints.png gex44:/root/fal-author/t55-tank-v1/states.png gex44:/root/fal-author/t55-tank-v1/pivots.png gex44:/root/fal-author/t55-tank-v1/nodes.json gex44:/root/fal-author/t55-tank-v1/NOTES.md .' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
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/bin/bash -lc "ssh gex44 'ps -eo pid,etime,args | grep \"[b]lender.*python /root/fal-author/t55-tank-v1/build_t55-tank.py\"'
python3 /tmp/t55-verify.py t55-tank.glb" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 727ms:
1540252       01:55 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1540255       01:55 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
t55-tank.glb bytes 8745280 triangles 134020 materials ['Paint', 'Metal', 'Lamps', 'Interior', 'TrackSteel', 'Wood', 'Canvas', 'Rubber']
nodes 60 parts 27 root ['Exhaust', 'Fx_Ammo', 'Fx_Engine', 'Hatch_Driver', 'Hull', 'Light_Head_L', 'Light_Head_R', 'Part_EngineGrille_L', 'Part_EngineGrille_R', 'Part_ExhaustShroud', 'Part_Fender_FL', 'Part_Fender_FR', 'Part_Fender_RL', 'Part_Fender_RR', 'Part_FuelCell_R4', 'Part_FuelCell_R21', 'Part_FuelCell_R38', 'Part_FuelDrum_1', 'Part_FuelDrum_2', 'Part_LampGuard_L', 'Part_LampGuard_R', 'Part_Snorkel', 'Part_SpareLinks', 'Part_Stowage_L4', 'Part_Stowage_L21', 'Part_Stowage_L38', 'Part_Tools', 'Part_TowCable', 'Part_UnditchingBeam', 'Seat_Driver', 'Track_L', 'Track_R', 'Turret', 'Wheel_L1', 'Wheel_L2', 'Wheel_L3', 'Wheel_L4', 'Wheel_L5', 'Wheel_L6', 'Wheel_L7', 'Wheel_R1', 'Wheel_R2', 'Wheel_R3', 'Wheel_R4', 'Wheel_R5', 'Wheel_R6', 'Wheel_R7']
images [('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Metal_Normal', (512, 512)), ('Metal_ORM', (512, 512)), ('Metal_Base', (512, 512)), ('Lamps_Normal', (512, 512)), ('Lamps_ORM', (512, 512)), ('Lamps_Base', (512, 512)), ('Interior_Normal', (512, 512)), ('Interior_ORM', (512, 512)), ('Interior_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512)), ('Wood_Normal', (512, 512)), ('Wood_ORM', (512, 512)), ('Wood_Base', (512, 512)), ('Canvas_Normal', (512, 512)), ('Canvas_ORM', (512, 512)), ('Canvas_Base', (512, 512)), ('Rubber_Normal', (512, 512)), ('Rubber_ORM', (512, 512)), ('Rubber_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]

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/bin/bash -lc "python3 /tmp/t55-contract.py .
python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py t55-tank.glb > /tmp/t55-audit-final-a.json
python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py t55-tank-damage.glb > /tmp/t55-audit-final-b.json
python3 - <<'PY'
import json
for n in ['a','b']:
 j=json.load(open('/tmp/t55-audit-final-'+n+'.json'));print(n,{k:j[k] for k in ['triangles','zero_area_triangles','nonfinite_attribute_components','findings']})
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 526ms:
PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets
Bounds {'min': [-1.635351538658142, 0.0014009466394782066, -3.271132230758667], 'max': [1.6401904821395874, 3.0999999046325684, 5.77500057220459]} counts {'healthy': 134020, 'damage': 83945, 'wreck': 36561}
a {'triangles': 134020, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0, 'findings': ['duplicate_primitives']}
b {'triangles': 83945, 'zero_area_triangles': 0, 'nonfinite_attribute_components': 0, 'findings': ['duplicate_primitives']}

codex
The reduced geometry passes the structural checks: 134k healthy triangles and 84k damage triangles, with no degenerate triangles or invalid coordinates. The final material pass is still queued; I’ll wait for that run before treating the deliverables as final.

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/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text().replace(\"healthy=list(bpy.context.scene.objects)\",\"for track in tracks:\\n floor=min(v.co.z for v in track.data.vertices)\\n for v in track.data.vertices:v.co.z-=floor\\nhealthy=list(bpy.context.scene.objects)\")
p.write_text(s);compile(s,str(p),'exec')
PY
ssh gex44 'ps -eo pid,args | grep \"[b]lender.real.*python /root/fal-author/t55-tank-v1/build_t55-tank.py\"'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 566ms:
1540255 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py

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/bin/bash -lc 'scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 830ms:
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/bin/bash -lc "ssh gex44 'ps -eo pid,etime,args | grep \"[b]lender.*python /root/fal-author/t55-tank-v1/build_t55-tank.py\"'
cat NOTES.md" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 600ms:
1540252       03:55 bash -c /root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1
1540255       03:55 python3 /opt/gpu-gate/gpu_gate.py --name blender --need-mib 6000 --priority batch -- /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
1552521       01:19 /root/blender-spike/blender-5.2.0-linux-x64/blender.real -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py
T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.
Triangles: healthy 134,020; damage 83,945; wreck 36,561.
Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior; damage adds Burnt and Scars.
Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.
Poly Haven CC0 IDs: green_metal_rust, rusty_metal, rubberized_track, bark_brown_02; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.
Reference differences: five road wheels follow the written brief; MG and antenna extend beyond the 2.40 m turret-height envelope; no insignia.

codex
The final pass is running now. The audit also confirms 27 removable parts, separate wheel pivots, the required damage roots, and paint factors in both files. Duplicate-geometry findings come from repeated component shapes such as wheels.

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/bin/bash -lc "ssh gex44 'tail -6 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 546ms:
02:20.632  render           | Saved: '/root/fal-author/t55-tank-v1/_state_3.png'
02:22.886  render           | Saved: '/root/fal-author/t55-tank-v1/_state_4.png'
02:24.282  render           | Saved: '/root/fal-author/t55-tank-v1/_state_5.png'
DONE {"healthy": 134020, "damage": 83945, "wreck": 36561}

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/bin/bash -lc "ssh gex44 'grep -aE \"Traceback|Error:|HEALTHY_EXPORTED|DONE\" /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 542ms:
HEALTHY_EXPORTED
DONE {"healthy": 134020, "damage": 83945, "wreck": 36561}

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/bin/bash -lc "ssh gex44 'tail -6 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 601ms:
01:42.791  render           | Saved: '/root/fal-author/t55-tank-v1/_state_3.png'
01:43.791  render           | Saved: '/root/fal-author/t55-tank-v1/_state_4.png'
01:44.779  render           | Saved: '/root/fal-author/t55-tank-v1/_state_5.png'
DONE {"healthy": 134020, "damage": 83945, "wreck": 36561}

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/bin/bash -lc 'scp gex44:/root/fal-author/t55-tank-v1/t55-tank.glb gex44:/root/fal-author/t55-tank-v1/t55-tank-damage.glb gex44:/root/fal-author/t55-tank-v1/final.png gex44:/root/fal-author/t55-tank-v1/side.png gex44:/root/fal-author/t55-tank-v1/clay.png gex44:/root/fal-author/t55-tank-v1/paints.png gex44:/root/fal-author/t55-tank-v1/states.png gex44:/root/fal-author/t55-tank-v1/pivots.png gex44:/root/fal-author/t55-tank-v1/nodes.json gex44:/root/fal-author/t55-tank-v1/NOTES.md .' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
codex
The clean build finished successfully. I’m copying the final files back and checking that the renders, metadata, and GLBs all belong to this run.

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/bin/bash -lc "cat NOTES.md
sha256sum build_t55-tank.py
ssh gex44 'sha256sum /root/fal-author/t55-tank-v1/build_t55-tank.py'
python3 /tmp/t55-contract.py .
python3 /tmp/t55-verify.py t55-tank.glb t55-tank-damage.glb" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 821ms:
T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.
Triangles: healthy 134,020; damage 83,945; wreck 36,561.
Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior, Scars; damage uses Paint, Burnt, Scars, TrackSteel, Rubber.
Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.
Poly Haven CC0 IDs: green_metal_rust, rusty_metal, rubberized_track, bark_brown_02; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.
Reference differences: simplified cast-surface variation and battle weathering; five road wheels follow the written brief; MG and antenna exceed the 2.40 m turret envelope.
9706565ef12d9105bdaaf6ea5271fb6496e6091a5805069b47940a6bf87c3333  build_t55-tank.py
9706565ef12d9105bdaaf6ea5271fb6496e6091a5805069b47940a6bf87c3333  /root/fal-author/t55-tank-v1/build_t55-tank.py
PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets
Bounds {'min': [-1.635351538658142, 0.0014009466394782066, -3.271132230758667], 'max': [1.6401904821395874, 3.0999999046325684, 5.77500057220459]} counts {'healthy': 134020, 'damage': 83945, 'wreck': 36561}
t55-tank.glb bytes 8995840 triangles 134020 materials ['Paint', 'Metal', 'Scars', 'Lamps', 'Interior', 'TrackSteel', 'Wood', 'Canvas', 'Rubber']
nodes 60 parts 27 root ['Exhaust', 'Fx_Ammo', 'Fx_Engine', 'Hatch_Driver', 'Hull', 'Light_Head_L', 'Light_Head_R', 'Part_EngineGrille_L', 'Part_EngineGrille_R', 'Part_ExhaustShroud', 'Part_Fender_FL', 'Part_Fender_FR', 'Part_Fender_RL', 'Part_Fender_RR', 'Part_FuelCell_R4', 'Part_FuelCell_R21', 'Part_FuelCell_R38', 'Part_FuelDrum_1', 'Part_FuelDrum_2', 'Part_LampGuard_L', 'Part_LampGuard_R', 'Part_Snorkel', 'Part_SpareLinks', 'Part_Stowage_L4', 'Part_Stowage_L21', 'Part_Stowage_L38', 'Part_Tools', 'Part_TowCable', 'Part_UnditchingBeam', 'Seat_Driver', 'Track_L', 'Track_R', 'Turret', 'Wheel_L1', 'Wheel_L2', 'Wheel_L3', 'Wheel_L4', 'Wheel_L5', 'Wheel_L6', 'Wheel_L7', 'Wheel_R1', 'Wheel_R2', 'Wheel_R3', 'Wheel_R4', 'Wheel_R5', 'Wheel_R6', 'Wheel_R7']
images [('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Metal_Normal', (512, 512)), ('Metal_ORM', (512, 512)), ('Metal_Base', (512, 512)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('Lamps_Normal', (512, 512)), ('Lamps_ORM', (512, 512)), ('Lamps_Base', (512, 512)), ('Interior_Normal', (512, 512)), ('Interior_ORM', (512, 512)), ('Interior_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512)), ('Wood_Normal', (512, 512)), ('Wood_ORM', (512, 512)), ('Wood_Base', (512, 512)), ('Canvas_Normal', (512, 512)), ('Canvas_ORM', (512, 512)), ('Canvas_Base', (512, 512)), ('Rubber_Normal', (512, 512)), ('Rubber_ORM', (512, 512)), ('Rubber_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]
t55-tank-damage.glb bytes 6460692 triangles 83945 materials ['Burnt', 'Paint', 'Scars', 'TrackSteel']
nodes 34 parts 0 root ['Hull_Damage', 'Turret_Damage', 'Wreck_Hull', 'Wreck_Turret']
images [('Burnt_Normal', (512, 512)), ('Burnt_ORM', (512, 512)), ('Burnt_Base', (512, 512)), ('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]

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exec
/bin/bash -lc "python3 - <<'PY'
import json,struct
b=open('t55-tank.glb','rb').read();n=struct.unpack_from('<I',b,12)[0];j=json.loads(b[20:20+n])
for node in j['nodes']:
 if node['name'].startswith('Track_'):
  print(node['name'], min(j['accessors'][p['attributes']['POSITION']]['min'][1] for p in j['meshes'][node['mesh']]['primitives']))
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
Track_L 0.0014009466394782066
Track_R 0.001512189512141049

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exec
/bin/bash -lc "python3 - <<'PY'
from pathlib import Path
p=Path('build_t55-tank.py');s=p.read_text();s=s.replace(\"poly.index>=before and poly.area<.05 and random.random()<.24\",\"poly.index>=before and poly.area<.008 and max(abs(v) for v in poly.normal)<.93 and random.random()<.24\")
s=s.replace(\"if dead:bmesh.ops.delete(bm,geom=dead,context='FACES')\\n  bm.to_mesh\", \"if dead:bmesh.ops.delete(bm,geom=dead,context='FACES')\\n  if ob.name in ['Track_L','Track_R']:\\n   used={v for f in bm.faces for v in f.verts};floor=min(v.co.z for v in used)\\n   for v in bm.verts:v.co.z-=floor\\n  bm.to_mesh\")
p.write_text(s);compile(s,str(p),'exec')
PY
scp build_t55-tank.py gex44:/root/fal-author/t55-tank-v1/build_t55-tank.py
ssh gex44 '/root/blender-spike/blender-5.2.0-linux-x64/blender -b --python-exit-code 1 --python /root/fal-author/t55-tank-v1/build_t55-tank.py > /root/fal-author/t55-tank-v1/build.log 2>&1'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
codex
The latest renders show the impact marks as irregular damage rather than rings. I spotted two cleanup issues: some wear patches are too broad, and export cleanup leaves the tracks about 1.5 mm above ground. I’m correcting those before the final copy.

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exec
/bin/bash -lc "ssh gex44 'tail -4 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 477ms:
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
Info: Baking map saved to internal image, save it externally or pack it
BAKED Scars

codex
The cleanup rebuild is running. The required files are generated and the structural checks pass; the remaining visual limitation is that cast-metal texture and battle weathering are simpler than the reference, which is documented in `NOTES.md`.

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exec
/bin/bash -lc "ssh gex44 'tail -5 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 528ms:
  world=S.world;world.use_nodes=True;world.node_tree.nodes['Background'].inputs[0].default_value=(.75,.78,.78,1);world.node_tree.nodes['Background'].inputs[1].default_value=.45
01:18.178  render           | Saved: '/root/fal-author/t55-tank-v1/final.png'
01:26.565  render           | Saved: '/root/fal-author/t55-tank-v1/side.png'
/root/fal-author/t55-tank-v1/build_t55-tank.py:647: DeprecationWarning: 'Material.use_nodes' is expected to be removed in Blender 6.0
  clay=bpy.data.materials.new('Clay');clay.diffuse_color=(.32,.32,.32,1);clay.use_nodes=True;clay.node_tree.nodes['Principled BSDF'].inputs['Roughness'].default_value=.8

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context compacted
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exec
/bin/bash -lc "ssh gex44 'tail -8 /root/fal-author/t55-tank-v1/build.log'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 483ms:
01:53.139  render           | Saved: '/root/fal-author/t55-tank-v1/_state_1.png'
01:54.170  render           | Saved: '/root/fal-author/t55-tank-v1/_state_2.png'
01:55.241  render           | Saved: '/root/fal-author/t55-tank-v1/_state_3.png'
01:56.240  render           | Saved: '/root/fal-author/t55-tank-v1/_state_4.png'
01:57.312  render           | Saved: '/root/fal-author/t55-tank-v1/_state_5.png'
DONE {"healthy": 134020, "damage": 83945, "wreck": 36561}

Blender quit

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exec
/bin/bash -lc 'scp gex44:/root/fal-author/t55-tank-v1/{t55-tank.glb,t55-tank-damage.glb,final.png,side.png,clay.png,paints.png,states.png,pivots.png,nodes.json,NOTES.md} .' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 11418ms:
codex
The clean build finished successfully: 134,020 triangles for the healthy tank and 83,945 for the damage kit. I’m checking the delivered files and inspecting the final renders now.

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exec
/bin/bash -lc 'python /tmp/t55-contract.py .' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 127 in 0ms:
/bin/bash: line 1: python: command not found

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exec
/bin/bash -lc 'python /tmp/t55-verify.py t55-tank.glb t55-tank-damage.glb' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 exited 127 in 0ms:
/bin/bash: line 1: python: command not found

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exec
/bin/bash -lc 'python3 /tmp/t55-contract.py .' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 10ms:
PASS: graph, sockets, wheel ordering, roots, damage mapping, paint factors, geometry and file budgets
Bounds {'min': [-1.635351538658142, 0.0, -3.271132230758667], 'max': [1.6401904821395874, 3.0999999046325684, 5.77500057220459]} counts {'healthy': 134020, 'damage': 83945, 'wreck': 36561}

exec
/bin/bash -lc 'python3 /tmp/t55-verify.py t55-tank.glb t55-tank-damage.glb' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
t55-tank.glb bytes 8903356 triangles 134020 materials ['Paint', 'Metal', 'Scars', 'Lamps', 'Interior', 'TrackSteel', 'Wood', 'Canvas', 'Rubber']
nodes 60 parts 27 root ['Exhaust', 'Fx_Ammo', 'Fx_Engine', 'Hatch_Driver', 'Hull', 'Light_Head_L', 'Light_Head_R', 'Part_EngineGrille_L', 'Part_EngineGrille_R', 'Part_ExhaustShroud', 'Part_Fender_FL', 'Part_Fender_FR', 'Part_Fender_RL', 'Part_Fender_RR', 'Part_FuelCell_R4', 'Part_FuelCell_R21', 'Part_FuelCell_R38', 'Part_FuelDrum_1', 'Part_FuelDrum_2', 'Part_LampGuard_L', 'Part_LampGuard_R', 'Part_Snorkel', 'Part_SpareLinks', 'Part_Stowage_L4', 'Part_Stowage_L21', 'Part_Stowage_L38', 'Part_Tools', 'Part_TowCable', 'Part_UnditchingBeam', 'Seat_Driver', 'Track_L', 'Track_R', 'Turret', 'Wheel_L1', 'Wheel_L2', 'Wheel_L3', 'Wheel_L4', 'Wheel_L5', 'Wheel_L6', 'Wheel_L7', 'Wheel_R1', 'Wheel_R2', 'Wheel_R3', 'Wheel_R4', 'Wheel_R5', 'Wheel_R6', 'Wheel_R7']
images [('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Metal_Normal', (512, 512)), ('Metal_ORM', (512, 512)), ('Metal_Base', (512, 512)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('Lamps_Normal', (512, 512)), ('Lamps_ORM', (512, 512)), ('Lamps_Base', (512, 512)), ('Interior_Normal', (512, 512)), ('Interior_ORM', (512, 512)), ('Interior_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512)), ('Wood_Normal', (512, 512)), ('Wood_ORM', (512, 512)), ('Wood_Base', (512, 512)), ('Canvas_Normal', (512, 512)), ('Canvas_ORM', (512, 512)), ('Canvas_Base', (512, 512)), ('Rubber_Normal', (512, 512)), ('Rubber_ORM', (512, 512)), ('Rubber_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]
t55-tank-damage.glb bytes 6459188 triangles 83945 materials ['Burnt', 'Paint', 'Scars', 'TrackSteel']
nodes 34 parts 0 root ['Hull_Damage', 'Turret_Damage', 'Wreck_Hull', 'Wreck_Turret']
images [('Burnt_Normal', (512, 512)), ('Burnt_ORM', (512, 512)), ('Burnt_Base', (512, 512)), ('Paint_Normal', (512, 512)), ('Paint_ORM', (512, 512)), ('Paint_Base', (1024, 1024)), ('Scars_Normal', (512, 512)), ('Scars_ORM', (512, 512)), ('Scars_Base', (512, 512)), ('TrackSteel_Normal', (512, 512)), ('TrackSteel_ORM', (512, 512)), ('TrackSteel_Base', (512, 512))]
paint [0.11, 0.14, 0.08, 1]

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exec
/bin/bash -lc 'cat NOTES.md' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
T-55-style Cold War tank, independently pivoted rig and removable equipment; matching tank-damage/v1 damage kit.
Triangles: healthy 134,020; damage 83,945; wreck 36,561.
Materials: Paint, Rubber, TrackSteel, Metal, Canvas, Wood, Lamps, Interior, Scars; damage uses Paint, Burnt, Scars, TrackSteel, Rubber.
Textures: Cycles-baked shared tiles; Paint base 1024; all other base/normal/ORM maps 512; ORM = AO/roughness/metallic.
Poly Haven CC0 IDs: green_metal_rust, rusty_metal, rubberized_track, bark_brown_02; https://polyhaven.com/license ; source maps https://polyhaven.com/a/<id>.
Reference differences: simplified cast-surface variation and battle weathering; five road wheels follow the written brief; MG and antenna exceed the 2.40 m turret envelope.

exec
/bin/bash -lc 'python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py t55-tank.glb > /tmp/t55-audit-final-a.json' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
exec
/bin/bash -lc "sha256sum build_t55-tank.py; ssh gex44 'sha256sum /root/fal-author/t55-tank-v1/build_t55-tank.py'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
exec
/bin/bash -lc 'python3 /home/claude-agent/.agents/skills/blender-game-assets/scripts/audit_glb.py t55-tank-damage.glb > /tmp/t55-audit-final-b.json' in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 95ms:
 succeeded in 118ms:
 succeeded in 732ms:
279921b6c350206d49c5c7eff42b60d90f70ecbb9e777b0b87207a1178b39f0d  build_t55-tank.py
279921b6c350206d49c5c7eff42b60d90f70ecbb9e777b0b87207a1178b39f0d  /root/fal-author/t55-tank-v1/build_t55-tank.py

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exec
/bin/bash -lc "python3 - <<'PY'
import json
for p in ['/tmp/t55-audit-final-a.json','/tmp/t55-audit-final-b.json']:
 d=json.load(open(p)); print(p); print(json.dumps(d)[:4500])
PY" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
/tmp/t55-audit-final-a.json
{"file": "t55-tank.glb", "sha256": "48c8e0ba6cfc393ebcdb585f7c9aeaeb47939112677f4b72760c9ca79d287c68", "bytes": 8903356, "primitive_count": 154, "material_count": 9, "embedded_images": 27, "external_uris": [], "primitives": [{"mesh": "Cylinder.486", "primitive": 0, "triangles": 416, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cylinder.486", "primitive": 1, "triangles": 252, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "armoured monocoque", "primitive": 0, "triangles": 1586, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "armoured monocoque", "primitive": 1, "triangles": 106, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "armoured monocoque", "primitive": 2, "triangles": 7340, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "armoured monocoque", "primitive": 3, "triangles": 376, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "armoured monocoque", "primitive": 4, "triangles": 252, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.906", "primitive": 0, "triangles": 316, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.906", "primitive": 1, "triangles": 465, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.906", "primitive": 2, "triangles": 63, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.893", "primitive": 0, "triangles": 316, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.893", "primitive": 1, "triangles": 447, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.893", "primitive": 2, "triangles": 81, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.919", "primitive": 0, "triangles": 44, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.919", "primitive": 1, "triangles": 44, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.919", "primitive": 2, "triangles": 36, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.855", "primitive": 0, "triangles": 702, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.855", "primitive": 1, "triangles": 6, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.872", "primitive": 0, "triangles": 704, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.872", "primitive": 1, "triangles": 4, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.856", "primitive": 0, "triangles": 704, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.856", "primitive": 1, "triangles": 4, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.873", "primitive": 0, "triangles": 698, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.873", "primitive": 1, "triangles": 10, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.874", "primitive": 0, "triangles": 84, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.874", "primitive": 1, "triangles": 4, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.874", "primitive": 2, "triangles": 224, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.879", "primitive": 0, "triangles": 79, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.879", "primitive": 1, "triangles": 9, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.879", "primitive": 2, "triangles": 224, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.884", "primitive": 0, "triangles": 83, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.884", "primitive": 1, "triangles": 5, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cube.884", "primitive": 2, "triangles": 224, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cylinder.442", "primitive": 0, "triangles": 3346, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cylinder.442", "primitive": 1, "triangles": 98, "zero_area_triangles": 0, "nonfinite_attribute_components": 0}, {"mesh": "Cylinder.442", "primitive": 2, "triangles": 1244, "ze
/tmp/t55-audit-final-b.json
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/bin/bash -lc "coord release 'local:/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
released 1

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exec
/bin/bash -lc "coord release 'gex44:/root/fal-author/t55-tank-v1/'" in /home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1
 succeeded in 0ms:
released 1

codex
Delivered both assets and the reproducible builder:

- [Healthy GLB](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/t55-tank.glb) — 134,020 triangles, 8.90 MB.
- [Damage GLB](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/t55-tank-damage.glb) — 83,945 triangles, 6.46 MB.
- [Final render](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/final.png) · [Six damage states](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/states.png)
- [Build script](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/build_t55-tank.py)

All requested renders, metadata and notes are in the directory. Rig hierarchy, damage mappings, paint factors and export budgets passed checks.

Cast-surface detail and weathering remain simpler than the reference; this is documented in `NOTES.md`.
tokens used
343,196
Delivered both assets and the reproducible builder:

- [Healthy GLB](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/t55-tank.glb) — 134,020 triangles, 8.90 MB.
- [Damage GLB](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/t55-tank-damage.glb) — 83,945 triangles, 6.46 MB.
- [Final render](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/final.png) · [Six damage states](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/states.png)
- [Build script](/home/claude-agent/forge-build/forge-assets/jobs/t55-tank-v1/build_t55-tank.py)

All requested renders, metadata and notes are in the directory. Rig hierarchy, damage mappings, paint factors and export budgets passed checks.

Cast-surface detail and weathering remain simpler than the reference; this is documented in `NOTES.md`.