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openspec/changes/enterprise-gaming-r3f-water/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-water
+
+- **Change ID**: enterprise-gaming-r3f-water
+- **Package**: `@suaveplan/r3f-water`
+- **Category**: gaming/scene
+- **Target path**: `gaming/scene/r3f-water`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-water.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-water` on the genesis branch from scratch at enterprise quality. The package provides water rendering and ocean simulation for React Three Fiber. A tiled plane mesh samples a Gerstner wave sum for animated surface displacement; a custom shader handles Fresnel reflections, refractive depth coloring, foam near shorelines (depth texture comparison), and specular highlights. An `Ocean` component wraps a configurable wave parameter set; a `WaterPlane` component handles simpler inland water. Genesis adds Zod wave config schemas, structured errors, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function Ocean(props: OceanProps): JSX.Element
+// waves: GerstnerWave[], tileSize, color, foamColor, windDirection
+
+function WaterPlane(props: WaterPlaneProps): JSX.Element
+// width, height, color, opacity, reflectionMap
+
+interface GerstnerWave {
+  direction: [number, number]
+  amplitude: number
+  steepness: number
+  wavelength: number
+}
+
+function useWaterHeight(x: number, z: number, time: number): number
+```
+
+---
+
+## File layout
+
+```text
+gaming/scene/r3f-water/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts / constants/index.ts
+    types/common.ts + md
+    shaders/
+      ocean.vert.ts + ocean.frag.ts
+    utils/
+      gerstner.ts + md + test
+    components/
+      Ocean/ (tsx + md + test + stories + index)
+      WaterPlane/ (tsx + md + test + stories + index)
+    hooks/use-water-height.ts + md + test
+  tests/integration.test.ts
+```

openspec/changes/enterprise-gaming-r3f-water/tasks.md

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+# Tasks: enterprise-gaming-r3f-water
+
+## 0. Pre-flight (non-negotiable)
+
+- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
+- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
+- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
+
+## Phase 1 — Scaffold
+
+- [ ] Create `gaming/scene/r3f-water/` (`@suaveplan/r3f-water`, `0.1.0`, `sideEffects: false`)
+
+## Phase 2 — Types + Gerstner math
+
+- [ ] `src/utils/gerstner.ts` — wave height sum at (x, z, t)
+- [ ] Tests + docs
+
+## Phase 3 — Shaders
+
+- [ ] Ocean vertex/fragment shaders (Fresnel, foam, depth color)
+
+## Phase 4 — Components + stories
+
+- [ ] `WaterPlane` — simple flat reflective water
+- [ ] `Ocean` — Gerstner-animated mesh + custom shader material
+
+## Phase 5 — `useWaterHeight` hook
+
+- [ ] Tests + docs
+
+## Phase 6 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-water` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-water`