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

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+# OpenSpec Change: enterprise-gaming-r3f-vegetation
+
+- **Change ID**: enterprise-gaming-r3f-vegetation
+- **Package**: `@suaveplan/r3f-vegetation`
+- **Category**: gaming/scene
+- **Target path**: `gaming/scene/r3f-vegetation`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-vegetation.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-vegetation` on the genesis branch from scratch at enterprise quality. The package provides R3F procedural vegetation with biome rules, LOD, and instanced placement. An `InstancedMesh`-backed placement engine scatters trees, grass, and rocks according to configurable biome rules (height/slope thresholds → vegetation type); LOD reduces instance count at distance; a wind animation vertex shader applies sinusoidal sway. Genesis adds Zod biome config schemas, structured errors, OTel instance-count gauge, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/r3f-terrain`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function Vegetation(props: VegetationProps): JSX.Element
+// biomeRules, density, maxDistance, windStrength
+
+function VegetationLayer(props: VegetationLayerProps): JSX.Element
+// type, mesh, count, scatterRadius
+
+function useVegetation(): VegetationCon```text
+
+---
+
+## File layout
+
+```text
+gaming/scene/r3f-vegetation/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts / constants/index.ts
+    types/common.ts + md
+    core/
+      biome-rules/ (ts + md + test + index)
+      instance-placer/ (ts + md + types + test + index)
+    shaders/
+      wind.glsl + wind.ts (glsl string export)
+    components/
+      Vegetation/ (tsx + md + test + stories + index)
+      VegetationLayer/ (tsx + md + test + stories + index)
+    hooks/use-vegetation.ts + md + test
+  tests/integration.test.ts
+```