Individual skill

threejs-shadow-systems

Implement stable, scalable directional-shadow systems for Three.js. Use for large procedural worlds, city scenes, terrain, moving cameras, WebGPU/TSL shadow nodes, cascades, cached clipmaps, texel stabilization, update budgets, and targeted invalidation.

skills/threejs-shadow-systems/SKILL.md

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License: MIT

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# Shadow Systems

Use a single shadow map only when its receiver region is genuinely bounded. For large moving views, make shadow coverage an explicit spatial hierarchy.

## Cached clipmap workflow

1. Define concentric light-space square levels.
2. Snap each level center to its own texel grid.
3. Cross-fade adjacent levels in shader space.
4. Refresh near levels continuously.
5. Cache coarse levels and update them under a frame budget.
6. Invalidate intersecting levels when important casters or streamed terrain change.
7. Scale normal bias by world-space texel width.