receiving-code-review
OBobra/superpowers298k2,631 new stars in the last 7 days
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.
- Star
- 898
- Category
- Coding & debugging
- License
- MIT
- Last commit
- Sep 23, 2026
skills/threejs-shadow-systems/SKILL.md
View on GitHubShadow 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
- Define concentric light-space square levels.
- Snap each level center to its own texel grid.
- Cross-fade adjacent levels in shader space.
- Refresh near levels continuously.
- Cache coarse levels and update them under a frame budget.
- Invalidate intersecting levels when important casters or streamed terrain change.
- Scale normal bias by world-space texel width.
Read references/cached-clipmap-shadows.md before implementing a large-world directional light.
Read the cached shadow clipmaps for three light-space square levels, per-level texel snapping, containment cross-fades, cached coarse updates, scaled bias, and unshadowed outside weight.
Failure conditions
- projection centers move by fractions of a texel;
- shader containment does not match the map's committed center;
- all cascades refresh every frame without evidence;
- coarse levels freeze moving casters indefinitely;
- depth texture samples occur in divergent fragment control flow;
- the same normal bias is used across radically different texel sizes;
- level boundaries become visible under camera motion.
Routing boundary
Use this skill for light-space directional shadow maps. Use
$threejs-screen-space-ambient-occlusion for view-dependent ambient
visibility; AO is not a replacement for cast shadows.
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