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

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+# OpenSpec Change: enterprise-gaming-r3f-terrain
+
+- **Change ID**: enterprise-gaming-r3f-terrain
+- **Package**: `@suaveplan/r3f-terrain`
+- **Category**: gaming/scene
+- **Target path**: `gaming/scene/r3f-terrain`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-terrain.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-terrain` on the genesis branch from scratch at enterprise quality. The package provides procedural terrain with chunked LOD for React Three Fiber. A `TerrainSystem` divides world space into equal-size chunks; each chunk generates a height-mapped `PlaneGeometry` using a pluggable noise function (simplex, perlin, or caller-supplied); LOD is managed by camera distance — near chunks use high subdivision, far chunks use low. Biome tinting (grass/rock/snow) is applied via vertex color or shader. Genesis adds Zod chunk config schemas, structured errors, OTel chunk-load histogram, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/spatial-hash`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface (key exports)
+
+```ts
+function Terrain(props: TerrainProps): JSX.Element
+// - chunkSize, worldSize, maxLOD, heightScale, noiseFn, biomeMap
+
+function useTerrainHeight(x: number, z: number): number   // sample height at world position
+```
+
+---
+
+## File layout
+
+```text
+gaming/scene/r3f-terrain/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/index.ts
+    types/common.ts + md
+    core/
+      terrain-system/ (ts + md + types + test + index)
+      chunk-manager/ (ts + md + types + test + index)
+      lod-controller/ (ts + md + types + test + index)
+    components/
+      Terrain/ (tsx + md + test + stories + index)
+      TerrainChunk/ (tsx + md + test + stories + index)
+    utils/
+      noise.ts + md + test
+      height-sample.ts + md + test
+  tests/integration.test.ts
+```

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

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+# Tasks: enterprise-gaming-r3f-terrain
+
+## 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-terrain/` (`@suaveplan/r3f-terrain`, `0.1.0`, `sideEffects: false`)
+
+## Phase 2 — Error codes + types
+
+- [ ] `src/error-codes.ts` + `src/types/common.ts` + `common.md`
+
+## Phase 3 — Noise utility
+
+- [ ] `src/utils/noise.ts` — simplex 2D noise, octave FBM
+- [ ] Tests + docs
+
+## Phase 4 — Height sample utility
+
+- [ ] `src/utils/height-sample.ts` — world XZ → height value from active terrain
+- [ ] Tests + docs
+
+## Phase 5 — Chunk manager
+
+- [ ] Camera-relative chunk loading/unloading, spatial hash for active set
+- [ ] Tests + docs
+
+## Phase 6 — LOD controller
+
+- [ ] Distance → subdivision level mapping, hysteresis band
+- [ ] Tests + docs
+
+## Phase 7 — Terrain system
+
+- [ ] Chunk generation with height + biome vertex color
+- [ ] Tests + docs
+
+## Phase 8 — Components
+
+- [ ] `TerrainChunk` — single chunk mesh
+- [ ] `Terrain` — top-level system with chunk manager wiring
+- [ ] Tests + Storybook stories
+
+## Phase 9 — Integration + pre-publish gate
+
+- [ ] `tests/integration.test.ts`
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-terrain` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-terrain`