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chore: import upstream snapshot with attribution
2026-07-13 12:58:35 +08:00

2.8 KiB

PORTING — turning a cap_fx3 demo into a first-class theme DNA

One theme at a time. The demo is the spec; the engine is the law.

Inputs

  • Demo: ~/Downloads/cap_fx3/<tNN_name>/ — index.html (bg: scene-reaction + apex setpiece), rail.html (fg alpha: body + furniture + front fx), postfx.json, final_fx.mp4 + strip.png (ground truth of how it should look).
  • Engine: scripts/make-theme.cjs — read the header + the existing paradigms (rail/panel/poem/takeover) and setpieces (detonation/decode/drawon/assembly/ colorflip/cpslam/coverword/settle) before writing anything.

Process

  1. DECOMPOSE the demo: body paradigm? body entrance/exit verbs? hero setpiece? front fx? plate budget? linkages? Map each piece to an existing registry entry or mark it NEW.
  2. EXTEND the engine for the NEW pieces only — port the demo's GSAP logic into generator functions, parameterized (sizes, colors, counts, seeds become DNA params). Registries stay generic: paradigms/setpieces are the unit of code, the DNA json is the unit of identity. Match the file's existing code style. node --check scripts/make-theme.cjs after every edit.
  3. WRITE themes/<name>.json (drop the tNN_ prefix). voice/when/register/fonts/ palette/body/hero/fx/plate/linkages — follow anchor.json + ordnance.json shape.
  4. VERIFY on the rooftop fixture:
    • scaffold: mkdir ~/Downloads/port_<name> + symlink source.mp4 / frames_fg / frames_bg + cp matte.fps transcript.json safe-zones.json from ~/Downloads/cap_multi/rooftop/ (frames_bg from ~/Downloads/cap_fx/_frames_bg).
    • theme.json: same lines/hero the demo used (read its rail.html data).
    • node scripts/make-theme.cjs <dir>preview-frames.cjs <dir> <4 key times> → READ the previews; compare against the demo's strip.png. Iterate ≤3 rounds.
    • full render: bash scripts/render-theme.sh <dir> → extract a 12-frame strip around the apex → view → compare to the demo strip. Small deviations OK, note them; the THEME must read identically at a glance.
  5. REGRESSION: recompile one prior theme project (e.g. ~/Downloads/cap_anchor, plus the previous port in this batch) — make-theme must still compile and a 2-frame preview must look unchanged.
  6. REGISTER: add the identity row to CATALOG.md (voice/when/needs, author → make-theme) and a line in themes/README.md if it has one.

Hard rules

  • The CONTRACT.md disciplines apply verbatim (determinism, physics doctrine, body stability, apex-owns-frame, equal-length keyframes, fonts whitelist, ≤ DUR scheduling): ~/Downloads/cap_fx3/CONTRACT.md.
  • Never edit existing setpieces'/paradigms' behavior unless fixing a bug — existing themes must not change appearance.
  • Do NOT commit; the orchestrator reviews and commits per batch.