# OpenSpec Change: enterprise-gaming-r3f-parallax

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

---

## Summary

Deliver `@suaveplan/r3f-parallax` on the genesis branch from scratch at enterprise quality. The package provides interior parallax components for React Three Fiber: `WindowParallax` (shared ray-marched room behind an array of portal quads using a single depth-layered texture atlas) and `GridParallax` (tiled M×N grid of parallax rooms on one plane). Both components are GPU-friendly, declarative R3F JSX. Configurable: lighting within rooms, depth layers, room-layout generation, and texture-atlas helpers. Storybook-driven with interactive controls for room parameters. Genesis adds structured errors, and 100% coverage.

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## Available workspace deps

`@suaveplan/error`, react, `@react-three/fiber`, `@react-three/drei`, three.

---

## Public API surface

```ts
function WindowParallax(props: WindowParallaxProps): JSX.Element
// columns, rows, roomDepth, atlasTexture, lightColor, lightIntensity

function GridParallax(props: GridParallaxProps): JSX.Element
// tileSize, roomDepthLayers, atlas

function generateRoomAtlas(rooms: RoomDefinition[], options: AtlasOptions): AtlasResult
```

---

## File layout

```text
gaming/effects/r3f-parallax/
  package.json / tsconfig.json / vitest.config.ts
  src/
    index.ts
    types/common.ts + md
    shaders/parallax.vert.ts + parallax.frag.ts
    utils/room-atlas-generator.ts + md + test
    components/
      WindowParallax/ (tsx + md + test + stories + index)
      GridParallax/ (tsx + md + test + stories + index)
  tests/integration.test.ts
```