Threejs Parallax Occlusion Mapping Agent Skill

Build silhouette-aware parallax occlusion mapping in Three.js WebGPU and TSL. Use for height-field ray marching, relief UVs, clipped flat or curved silhouettes, inflated shells, self-shadowing, relief-aware shadow depth, and height-derived normals.

13k tokens

context cost

the whole folder, loaded on every use

files

ships runnable scripts

copies elsewhere

how many repositories repackaged it

527

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills --skill threejs-parallax-occlusion-mapping

The instruction itself

5 sections, as written by the author

Parallax Occlusion Mapping

Treat relief as a coupled intersection, coverage, normal, and shadow system.

Do not stop at offsetting texture coordinates.

Build order

tangent frame and height convention
  -> view-ray march and hit refinement
  -> bounded or curved silhouette coverage
  -> shared marched sampling
  -> height-derived shading normal
  -> light-ray self-shadow march
  -> relief-aware cast/received shadow positions

Read references/silhouette-relief-contract.md

for the intersection contract, flat and curved silhouette modes, shell

inflation, shadow integration, quality controls, and diagnostics.

Read the

silhouette relief implementation

for the complete TSL march, binary hit refinement, gradient-safe sampling,

coverage, horizon trimming, curved sag, and self-shadow function.

Read the

complete bulkhead assembly

and its packed procedural height maps

for a wall, deck, relief columns, and overhead pipes using height-derived

normals, inflated cylinder shells, alpha-to-coverage, shadow-mask carving,

marched shadow depth, and received-shadow positions.

Required controls

world or UV relief scale;
minimum and maximum view-march layers;
silhouette bounds and feathering;
curved-surface curvature or curvature callback;
horizon trimming and edge erosion;
self-shadow steps, bias, and strength;
geometry, carved, and full-relief shadow modes;
height, coverage, marched UV, normal, and shadow diagnostics.

Failure conditions

color, normal, and roughness rebuild separate view marches unintentionally;
a curved host uses flat silhouette clipping at its geometric horizon;
an inflated shell changes the relief floor instead of keeping it on the base surface;
alpha-tested beauty coverage is assumed to carve shadow maps automatically;
derivative sampling runs behind discard on drivers where it erodes coverage;
grazing rays divide by an unbounded view-space Z component;
relief self-shadowing darkens fill or emission indiscriminately.

Routing boundary

Use $threejs-procedural-materials when no ray-marched height intersection or

silhouette ownership is required. Use $threejs-procedural-geometry when the

silhouette must be actual mesh topology rather than a view-dependent relief.

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How to use it

Copy the folder

Take scottstts/threejs-parallax-occlusion-mapping from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.