# OpenSpec Change: enterprise-gaming-r3f-animation

- **Change ID**: enterprise-gaming-r3f-animation
- **Package**: `@suaveplan/r3f-animation`
- **Category**: gaming/character
- **Target path**: `gaming/character/r3f-animation`
- **Status**: PROPOSED
- **Date**: 2026-04-24
- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-animation.md`

---

## Summary

Deliver `@suaveplan/r3f-animation` on the genesis branch from scratch at enterprise quality. The package provides animation state machine, blend trees, and layers for React Three Fiber. An `AnimationStateMachine` manages named states with blend tree leaves and transition conditions; `AnimationLayer` enables masked additive/override layers (e.g. upper-body aim overlay); `AnimationBlendTree` interpolates between clips by blend parameters (speed, direction). `@suaveplan/mixamo` normalisation and `@suaveplan/animation-events` dispatch are integrated. Genesis adds structured errors, OTel blend-duration histogram, and 100% coverage.

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## Available workspace deps

`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/mixamo`, `@suaveplan/animation-events`, `@suaveplan/ik-solver`, react, `@react-three/fiber`, `@react-three/drei`, three.

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## Public API surface

```ts
function AnimationController(props: AnimationControllerProps): JSX.Element
// stateMachine, blendParameters, layers, eventDispatcher

function useAnimation(): AnimationContext
// currentState, setParameter(), playAction(), crossFadeTo()
```

---

## File layout

```text
gaming/character/r3f-animation/
  package.json / tsconfig.json / vitest.config.ts
  src/
    index.ts / error-codes.ts
    types/common.ts + md
    core/
      state-machine/ (ts + md + types + test + index)
      blend-tree/ (ts + md + types + test + index)
      animation-layer/ (ts + md + types + test + index)
    context/animation-provider.tsx + md + test
    hooks/use-animation.ts + md + test
    components/
      AnimationController/ (tsx + md + test + stories + index)
  tests/integration.test.ts
```