SCENEGOD/logs/laneC.md

Lane C log — append-only, newest at bottom

Format per session:

## <date> session N
DONE: …
DECISIONS: …
BLOCKED/REQUESTS: …
NEXT: …

2026-07-18 session 1

DONE: M1 code-complete. Commit bb85eef.

• requirements.txt (fastapi, uvicorn only); .gitignore += .venv/.
• scenegod/server.py single file: statics (/ no-store placeholder, /web/{path} short-cache, path-guarded), /assets/tree (5s cache, per-category grouping), /assets/file (traversal-guarded), /scenes CRUD with atomic write + slugify + validate_scene, render endpoints (begin/frame accept + save; end/status/out 501 until M3).
• scripts/test_server.py: 5 groups green (tree grouping, file stream, 4 traversal attempts rejected, scene round-trip w/ slugify, 5 validation failures + 1 fade-overlap-allowed). OK: 5 test groups passed. DECISIONS:
• System python3 is 3.14 (fastapi present but pydantic missing); made a .venv on python3.11 per CLAUDE.md stack rule. Tests + server use .venv/bin/python. .venv/ gitignored.
• web/ is under scenegod/web/ per PLAN §2 (not repo root) — WEB points there; Lane A/B statics resolve via /web/{path}.
• Asset grouping: per-category primary ext set (models for chars/anims/ props, images for backdrops, audio for audio). Non-primary image sharing a stem → thumb, not a format. path prefers glb else first model. Entries with no primary format dropped (thumb-only stems aren't assets).
• Clip-overlap check: violation if next.start < a.end - a.fade, where a.end = start + (out-in)*loop. Fade-region overlap allowed. BLOCKED/REQUESTS: none. NEXT: M2 (when unlocked): scene-validation hardening + asset thumbnails endpoint. M3 render pipeline (ffmpeg encode + web/render.js) is designed in C-server.md §C5, endpoints already stubbed — implement at SYNC-2/M3.

2026-07-18 session 2

DONE: M2 thumbnails + M3 render pipeline (orchestrator green-lit both). Commit b627a0f.

• /render/begin (uuid dir + meta.json, 503 if no ffmpeg), /frame/{n} (PNG->frames/{n:06d}.png, 400 on empty), /end (spawns bg ffmpeg thread: libx264 crf18 yuv420p, 400 if no frames), /status (queued|encoding| done|error+log tail; on-disk out.mp4 fallback after restart), /out.mp4.
• Boot-time reap_renders() deletes render dirs >48h.
• /assets/thumb?path= serves same-stem image sidecar (404 if none).
• web/render.js: draftRecord (MediaRecorder webm), finalRender (timeline.step -> renderActiveCamera -> toBlob -> POST, <=4 in flight, resize+restore renderer), download() helper. node --check clean.
• test_server.py: added render group (ffmpeg lavfi -> 30 PNGs -> begin -> post -> end -> poll -> ffprobe duration ~1s) + thumbnail asserts. OK: 6 test groups passed. DECISIONS:
• Render state in-memory (single-process local tool); status() infers from disk after a restart. ponytail-commented.
• Thumbnails pass-through, no resize — Pillow would be a new dep (stack rule says log a REQUEST first); not worth it until dock load is measurably slow.
• finalRender total frames = round(duration*fps); relies on timeline.step being deterministic (orchestrator verified). BLOCKED/REQUESTS:
• finalRender's per-frame path depends on Lane A stage.renderActiveCamera as a real render target (their M2). Server + ffmpeg path fully tested with synthetic frames; the browser client path is unexercised until A lands it. NEXT: M4 is locked. When unlocked: ffmpeg audio mux (scene audio[]), /mb/submit MODELBEAST proxy, scripts/graft_limb.py. Meanwhile available to integration-test finalRender once Lane A's renderActiveCamera lands.

2026-07-18 session 3

DONE: M4 complete (unlocked after SYNC 3). Commit be65355.

• Audio mux: /render/end now accepts {audio:[{path,start,gain}]}, muxes via ffmpeg adelay+volume+amix -> aac -shortest; audio paths path-guarded (400 on missing). render.js finalRender passes opts.audio through.
• scripts/graft_limb.py: headless Blender (blender -b -P ... -- --body B --limb L --bone NAME --out O). Align limb root head->target bone world head, join armatures, parent limb root under target (keep offset), join meshes (vgroup weights survive). Refusal: overlapping bones -> GraftRefused -> exit 2 "re-skin, don't graft". No finish/decimate. --selftest builds synthetic body/limb GLBs and verifies refusal + graft paths under Blender.
• /mb/submit: MODELBEAST proxy, SCENEGOD_MB=1 gated (503 otherwise), token from ~/Documents/backnforth/.env at request time (never logged; errors scrub it), /api/assets multipart -> /api/jobs, mirrors meshgod/ops.py.
• test_server.py: 8 groups green (added audio-stream assert, MB gating, MB two-step contract via in-process mock — no farm jobs). DECISIONS:
• Blender 5 glTF importer injects a stray unparented 42-vert icosphere on every import; _import now keeps only rig-connected meshes (parented to armature / has vgroups / armature modifier) and deletes strays. Right filter for a graft tool regardless.
• graft refusal check: provides = limb bones - {limb root}; refuse if provides ∩ body bones. Attach/root bone sharing the target name is expected.
• MB test uses a stdlib http.server mock + a 2nd scenegod instance; asserts Bearer token forwarded, multipart upload, asset_id chained into job payload. BLOCKED/REQUESTS: none. BACKLOG (from orchestrator, not urgent): draft webm via MediaRecorder is untested in the embedded preview (rAF suspension). Needs one verification in a real Chrome window before calling draftRecord done — client-only, needs Lane A stage running live; deferred. NEXT: Lane C M1-M4 all shipped. Available for polish / integration support. Blender binary here is /Applications/Blender.app/Contents/MacOS/Blender (not on PATH as blender in this session, contrary to orchestrator note).