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threejs-procedural-animation

Build advanced procedural animation in Three.js. Use for launch kinematics, gravity turns, staging, spin docking, target-frame decomposition, spring-follow motion, rotating-frame alignment, peeling debris, analytic transform timelines, frame-rate-independent response, and quaternion control.

Star
898
分类
图像与视频
许可证
MIT
最近提交
2026年9月23日

skills/threejs-procedural-animation/SKILL.md

在 GitHub 上查看

Procedural Animation

Animate semantic state, not unrelated transform curves. Define phases, coordinate frames, velocities, and ownership before writing per-frame updates.

Build order

  1. Define the timeline phases and event boundaries.
  2. Choose the frame for each motion: world, subject local, orbital radial, docking axis, or camera shot.
  3. Derive target position/orientation from that frame.
  4. Use analytic kinematics for authored travel and springs for responsive convergence.
  5. Preserve world transforms when detaching children from a hierarchy.
  6. Separate translation, alignment, spin, and secondary debris state.
  7. Clamp integration delta and reset every state variable on replay/disposal.

Read references/procedural-motion-and-docking-systems.md for the launch, staging, docking, debris, spring, quaternion, and frame-rate-independent response implementations.

Non-negotiable rules

  • Use elapsed seconds and deltaSeconds; do not make motion frame-count based.
  • Derive orientation from direction/frame, then apply roll or spin as a separate quaternion.
  • Decompose docking error into axial and radial components.
  • Switch from spring convergence to an exact terminal pose at the end of a sequence.
  • When reparenting an animated object, capture world position, quaternion, and scale before removal.
  • Use seeded randomness when motion must be reproducible.
  • Keep visual shake in a bounded envelope and separate it from trajectory.

Routing boundary

Use $threejs-camera-direction for shot composition and camera handoffs. Use $threejs-procedural-vfx when the deliverable is primarily plasma, sparks, or effect pooling rather than object transform motion.

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