SCENEGOD/logs/laneB.md
type-two bbb3f99016 [laneB] log: M2 session 2
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-18 20:11:03 +10:00

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# Lane B log — append-only, newest at bottom
Format per session:
## <date> session N
DONE: …
DECISIONS: …
BLOCKED/REQUESTS: …
NEXT: …
## 2026-07-18 session 1
DONE: M1 complete. All files under `scenegod/web/`.
- `timeline.js` — model + clock, no DOM, no three import (self-contained
quat/euler/slerp math so `node` can run it). `load/toJSON` lossless
round-trip (unknown entity fields preserved via structuredClone + a
WeakMap for cached quats). `evaluate(t)`: transform (pos/scale lerp, rot
slerp→euler, easing incl. step-hold), params (num lerp, color sRGB lerp),
clip blocks (set-time exact scrubbing, fade-out ramp), camera cuts (fires
only on change). Clock: `play()` rAF deltas, `seek` clamp, `step(frame)`
pure/deterministic for Lane C render. Mutators addKey/moveKey/deleteKey/
addClipBlock/moveClipBlock/trimClipBlock/addCut + undo stack (`undo()`
wired; Ctrl+Z hooked in tlui). `capturekey` window listener present.
Clips need `await tl.preload()` before evaluate (prepareClip is async).
- `tlui.js` — canvas panel into `#timeline`. Ruler scrub, drag playhead,
space=play/pause, dblclick lane=add key from stage state, drag key (snap
to frame, Alt=free), right-click=delete, drag clip block/edge, Home/End,
Ctrl+Z. Scene bar name/dur + Save/Load (POST/GET `/scenes/{name}`,
localStorage fallback). Names column auto-syncs to `stage.entities()` via
`onChange`.
- `stagestub.js` — full §4.2 Stage as plain objects; records effects into
`stage.applied[]`. Dev-only, delete at SYNC 1.
- `timeline_test.mjs``node scenegod/web/timeline_test.mjs` → green
(midpoint interp, step-ease hold, clip local time @3 frames, camera flip,
lossless round-trip, unknown-field preservation).
- `tldev.html` — dev-only browser harness. Verified in browser: scrub moves
entities (interp live in log), play runs to duration + auto-stops, camera
cut flips camA→camB at t=3, keys/clips/cuts render. Delete at SYNC 1.
DECISIONS:
- Timeline imports NO three.js — inlined euler↔quat + slerp (~30 lines) so
the node self-check needs zero deps (there is no node_modules/three in
this stack). setTransform rot is euler (matches entityTransform format).
- One `<canvas>` for all lanes (not canvas-per-lane); hit-testing via a
hitbox list rebuilt each draw. Simpler, fast enough at this scale.
- CSS injected from tlui.js via a `<style id=laneB-tl-css>` rather than
creating `web/style.css` — that file is Lane A's and didn't exist yet.
Move into a `/* === LANE B === */` block at SYNC if John wants it
centralized. (See REQUEST below.)
- M1 crossfade = fade-OUT only; cross-block fade-IN is M2 "crossfade polish"
per the milestone list. Marked with a ponytail comment in timeline.js.
BLOCKED/REQUESTS:
- None blocking. Note for orchestrator/Lane A: my timeline styles live in
an injected `<style>` in tlui.js. If you'd rather they sit in style.css,
say so and I'll emit a `/* === LANE B === */` block for Lane A to paste
(I won't edit style.css directly — ownership).
- Lane A's files (index.html, stage.js, room3d.js, dock.js, style.css) are
present untracked in the shared working dir but uncommitted — I staged
ONLY my 5 files, left theirs alone.
NEXT: Hold at M1 boundary. At SYNC 1 the stub swaps for the real Stage
(one-line change in the page import) and tldev.html/stagestub.js get
deleted. M2 (locked): clip crossfade polish, params/cut lane UI, snapping
config, undo Ctrl+Z already stubbed, box-select multi-drag.
## 2026-07-18 session 2 (M2)
DONE: M2 per orchestrator update. SYNC findings fixed first, then polish.
- SYNC1 #3a/#3b: added `Timeline.onLoad(cb)`; `load()` fires it →
TimelineUI rebuilds rows + refreshes name/duration fields. Verified with
the exact repro (UI built against empty stage, then `load()` a 2-entity
scene → rows now appear, scene bar updates).
- SYNC1 #4 clipdrop: `scenegod:clipdrop {id,path,clipIndex}``addClipDrop`
drops a block at the playhead, `out = clip.duration` (from preload), auto
`fade:0.25` where it abuts a neighbour. Verified via dispatched event.
- Crossfade fade-IN (was fade-OUT only): a predecessor's fade pre-rolls the
successor's playback start earlier by `pred.fade` so local time is
continuous across the boundary; weights ramp 1→0 / 0→1 and sum to 1
(asserted in test).
- Params lanes (per-key hue), camera-cut lane add via dblclick on Cameras
row (uses active cam / first camera), snap toggle in scene bar (Alt still
= free), box-select + multi-drag + Delete of keys, selection highlight,
fade wedge drawn on clip blocks, panel grows to content height (was fixed
200px → clipped the Cameras row once params rows were added).
- timeline_test.mjs extended: onLoad fires once, addClipDrop out=duration,
crossfade weights sum to 1. All green.
DECISIONS / BUG:
- **tlui reads tracks from the TIMELINE, not the stage entity.** Found mid-
verify: `load()` structuredClones the scene, so timeline.scene.entities and
stage entities are SEPARATE objects. Drawing from stage meant clipdrop/
addKey (which mutate the timeline copy) never appeared. Repointed all draw
methods to `_te(id) = tl.scene.entities.find(id)`. Rows now built from the
timeline list merged with any stage-only (dock-added, not-yet-keyframed)
entities. Per PLAN the timeline owns tracks — this is the correct source.
- Grow-to-content height, no scroll yet (ponytail: add max-height+scroll only
if a scene ever has enough entities to dominate the viewport).
BLOCKED/REQUESTS:
- Gap for the orchestrator/Lane A to note: there's no bridge for a
dock-added stage entity to enter `timeline.scene.entities`, so a freshly
dropped character can't be keyframed until a scene load. tlui shows it as a
row (empty tracks) but mutators need the entity present. If Lane A's dock
should register new entities with the timeline, we need a
`timeline.addEntity(desc)` (or the dock calls `stage.captureState()`
`timeline.load`). Flagging for SYNC 2 — not building it uninvited.
- Verified with a throwaway harness (`_check.html`) served on :8099; deleted,
NOT committed (orchestrator removed the M1 tldev.html deliberately).
NEXT: Hold at M2. Remaining M2 polish if a session 3 is granted: undo already
wired to Ctrl+Z; could add snapping increment config + keyable-param add UI
(currently params keys come from Lane A capture/inspector). Await SYNC 2.