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motion-stack

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用代码做动效短片的通用底座：按 brief 从 20 个开源库（Three.js、PixiJS、p5、Paper、Matter、Rapier、anime.js、tsParticles、OGL、GL Transitions、Tone.js、Chatterbox、faster-whisper、Remotion、HyperFrames、FFmpeg 等）里挑最小组合，写成「画面是时间的纯函数」的场景，用本地无头渲染器出 MP4（可带离线合成的音效），并自动写出可复现清单（库版本、字体、文件哈希、引擎版本、命令）。当用户说「做个动效 / motion 短片 / 物理动画 / 3D 动画视频 / 用 three.js 做个视频 / 用这套 motion stack」时使用。MV、知识视频、尺寸图动画走各自专用 skill。只在明确请求时触发，忽略顺带提及。

skills/motion-stack/SKILL.md

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# Motion stack：从 brief 到可复现的成片

用中文交流。用户给方向和审片意见，你挑库、写场景、渲染、自检。

**这个 skill 要支撑的决定**：一个新的动效 brief，能不能不重写渲染器、只写一个场景文件就出片，并且两次渲染结果逐位一致。
**放弃条件**：到 2026-11-25 为止，除自带示例外没有一部片子用它做出来；或者连续两个项目都得改 `kit/render.mjs` 才能用。满足任一条就停用。每做完一部，在下方“做过的片子”表里记一行。

## 先分流

下表里的其他 skill 装了就用它们的现成流程；没装时，这些片子也能用本 skill 从头做。

| brief 是什么 | 用哪个 |
|---|---|
| 歌词 MV、有歌有角色的片子 | `ai-music-video`（已有成片的完整流程） |
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