CK42BB/procedural-grass-threejs

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# Procedural Grass — Claude Three.js Skill A Claude Code skill for generating dense, animated procedural grass fields in Three.js, emphasizing **WebGPU compute with WebGL fallback**. Part of the **Teaching Three.js** skill series. ## What This Skill Does When installed, this skill teaches Claude Code how to generate procedural grass including: - **Bezier-curved blade geometry** with tapered triangle strips and configurable segments - **Instanced rendering** — hundreds of thousands of blades in a single draw call - **Multi-layer wind system** — global sway, rolling gust waves, per-blade turbulence - **Subsurface scattering** approximation for realistic backlit translucency - **Terrain-aware placement** with slope rejection, density modulation, and jittered grids - **Interactive displacement** — grass pushes aside from players/objects - **Distance-based LOD** — density fade and blade simplification by camera distance - **8 grass type presets** — lawn, meadow, tall prairie, wheat, savanna, reeds, tundra, tropical - **GPU compute placement** via WGSL for WebGPU-accelerated scatter - **Seasonal color** modulation and mixed multi-type fields ## Installation ### Claude Code (CLI) ```bash claude install-skill path/to/procedural-grass ``` Or copy the `procedural-grass/` folder into your Claude Code skills directory. ### Manual Usage Reference the skill files directly in conversations with Claude: | File | Purpose | |------|---------| | `SKILL.md` | Main skill — blade geometry, placement, wind, materials, LOD, presets | | `references/blade-shaders.md` | Complete GLSL vert/frag shaders, WGSL compute, TSL wind nodes | | `references/grass-types.md` | 8 species profiles with dimensions, colors, density, biome maps | ## Quick Start Prompts Try these with Claude after installing: > "Create a meadow with procedural grass blowing in the wind" > "Build a wheat field with golden backlit grass and interactive displacement" > "Generate savanna-style grass with clumpy tufts and bare patches" > "Create a mixed temperate grass field with three LOD rings and distance fade" > "Add procedural grass to my existing terrain with WebGPU compute placement" ## Requirements - **Three.js r170+** for WebGPU support and TSL node materials - WebGPU-capable browser (Chrome 121+, Edge 121+) for GPU compute features - WebGL2 fallback works in all modern browsers ## Skill Architecture ``` procedural-grass/ ├── SKILL.md # Core skill (read first) ├── README.md # This file └── references/ ├── blade-shaders.md # GLSL, WGSL, and TSL shader code └── grass-types.md # Species profiles and presets ``` ## Key Concepts ### Blade Geometry Each grass blade is a **tapered triangle strip** shaped along a quadratic bezier curve. This gives natural curvature with minimal vertex count (as few as 7 vertices per blade at low LOD). ### Wind Layers Wind is not a single sine wave — it's three layered frequencies that combine for realism: | Layer | Frequency | Effect | |-------|-----------|--------| | Global sway | Low | Entire field leans together | | Gust waves | Medium | Visible "fronts" rolling across | | Turbulence | High | Individual blade flutter | All wind is computed in the vertex shader — zero per-frame JavaScript loops. ### Performance Targets | Platform | Max Blades | Approach | |----------|-----------|----------| | Mobile | 50K–100K | Single InstancedMesh, 3-segment blades | | Desktop | 200K–500K | LOD rings, 5-segment blades | | High-end + WebGPU | 500K–2M | GPU compute placement, storage buffers | ### Grass Type Presets 8 built-in presets with full geometry, color, wind, and density settings: | Type | Height | Character | |------|--------|-----------| | Lawn | 0.25m | Dense, short, barely moves | | Meadow | 0.9m | Natural pastoral, gentle sway | | Tall Prairie | 1.8m | Dramatic deep movement | | Wheat | 1.15m | Golden, drooping heads | | Savanna | 0.75m | Sparse dry tufts | | Reeds | 2.2m | Tall, straight, waterside | | Tundra | 0.18m | Stubby, wind-battered | | Tropical | 1.5m | Lush, broad, vivid green | ## Series: Teaching Three.js Independent skills that compose for complete environments: - [procedural-landscapes](../procedural-landscapes-threejs/) — terrain - [procedural-clouds](../procedural-clouds-threejs/) — clouds - [procedural-stars](../procedural-stars-threejs/) — nightime skies - [procedural-weather](../procedural-weather-threejs/) — precipitation and atmosphere - **procedural-grass** ← this skill. **Companion skill**: [procedural-landscapes](../procedural-landscapes/) — terrain generation pairs naturally with this grass system. ## License MIT — use freely in your projects.

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Generate procedural grass fields in Three.js using WebGPU compute with automatic WebGL2 fallback. Covers instanced blade geometry with bezier-curve profiles, multi-layer wind simulation, subsurface scattering approximation, distance-based LOD and density…

원문 언어: 영어

2026-02-12

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