# OpenSpec Change: enterprise-gaming-r3f-physics-rapier

- **Change ID**: enterprise-gaming-r3f-physics-rapier
- **Package**: `@suaveplan/r3f-physics-rapier`
- **Category**: gaming/physics
- **Target path**: `gaming/physics/r3f-physics-rapier`
- **Status**: PROPOSED
- **Date**: 2026-04-24

---

## Summary

Deliver `@suaveplan/r3f-physics-rapier` on the genesis branch from scratch at enterprise quality. The package provides a Rapier physics engine integration for React Three Fiber, implementing the `PhysicsBackend` interface from `@suaveplan/r3f-physics-core`. It wraps `@dimforge/rapier3d-compat` (WASM); a `RapierPhysicsProvider` initialises the WASM module asynchronously and provides a `RAPIER.World`; `RigidBody`, `Collider`, and `Joint` components wrap the corresponding Rapier APIs; `useRapierContext()` exposes the raw `RAPIER.World` for advanced usage. Genesis adds structured errors, and 100% coverage.

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## Available workspace deps

`@suaveplan/error`, `@suaveplan/r3f-physics-core`, react, `@react-three/fiber`, `@dimforge/rapier3d-compat`, three.

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## Public API surface

```ts
function RapierPhysicsProvider(props: RapierProviderProps): JSX.Element
function RigidBody(props: RigidBodyProps): JSX.Element
function Collider(props: ColliderProps): JSX.Element
function useRapierContext(): RapierCon```text

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## File layout

```text
gaming/physics/r3f-physics-rapier/
  package.json / tsconfig.json / vitest.config.ts
  src/
    index.ts / error-codes.ts
    types/common.ts + md
    context/rapier-provider.tsx + md + test
    hooks/use-rapier-context.ts + md + test
    components/
      RigidBody/ (tsx + md + test + stories + index)
      Collider/ (tsx + md + test + stories + index)
  tests/integration.test.ts
```