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threejs-lighting · calesthio — Claude Code skill: what it does, how to install

Reference guide for configuring lights and shadows in Three.js scenes. Useful when placing light sources, tuning shadow maps, or fixing render artifacts.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add calesthio/OpenMontage --skill threejs-lighting -a claude-code
Open on GitHub

What threejs-lighting does

The skill supplies your AI assistant with implementation patterns for Three.js illumination. It covers standard light sources including AmbientLight, HemisphereLight, DirectionalLight, PointLight, SpotLight, and RectAreaLight. It also details relative performance costs, from cheap ambient fills to resource-heavy area panels.

Shadow configuration receives dedicated attention. The reference covers activating renderer.shadowMap, choosing map algorithms such as PCFSoftShadowMap, and clipping frustums for directional shadow cameras. Specific values for bias and normalBias help resolve shadow acne artifacts.

A notable catch involves RectAreaLight: it functions only with MeshStandardMaterial and MeshPhysicalMaterial, and demands RectAreaLightUniformsLib.init() before use. Skipping uniform initialization will break rendering immediately.

What it helps with

  • select the right Three.js light type based on performance cost
  • configure shadow maps and camera frustums for directional or spot lights
  • eliminate shadow acne artifacts using bias and normalBias
  • set up fast contact shadows using ContactShadows

Example prompts for the agent

  • Set up a directional light with PCF soft shadows in my Three.js scene
  • How do I fix shadow acne on my directional light shadow camera?
  • Add a RectAreaLight with helper and initialize its uniforms

How to install threejs-lighting

1Skills CLI (Vercel)

npx skills add calesthio/OpenMontage --skill threejs-lighting -a claude-code

2Manually: put the files in place

~/.claude/skills/threejs-lighting/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/threejs-lighting/

From the same set28

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Other versions of threejs-lighting

threejs-lighting CloudAI-X Three.js r186 lighting skill for WebGL and WebGPU. It guides physical light units, cascaded shadow maps, and RectAreaLight setup. Claude Code CX Codex Cursor +1 13,100installs

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Questions about threejs-lighting

How do I install threejs-lighting in Claude Code?

Run npx skills add calesthio/OpenMontage --skill threejs-lighting -a claude-code. The file will be placed at ~/.claude/skills/threejs-lighting/SKILL.md.

What does threejs-lighting do?

It provides code patterns and reference tables for Three.js lights, shadow camera settings, bias adjustments, and fake contact shadows.

What are the limitations of RectAreaLight?

It only works alongside MeshStandardMaterial or MeshPhysicalMaterial and does not support native shadows. You must also execute RectAreaLightUniformsLib.init() prior to creating the light.

See also

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