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alton47alton47/threejs-skills/skills/threejs-lighting/SKILL.md

threejs-lighting

Skill13 starsChanged 7 months agoMITView on GitHub

Configures Three.js lights — AmbientLight, DirectionalLight, PointLight, SpotLight, RectAreaLight, shadows, HDR environment lighting, and light probes. Use when the user asks about lighting, shadows, light setup, HDR, environment maps for lighting, or realistic rendering. Trigger keywords: light, lighting, shadow, DirectionalLight, PointLight, SpotLight, ambient, HDRI, environment.

We split this skill into the rules it gives an agent

1 rule. 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • 0

    Common

    Most of the 17 edited versions we read keep these.

  • 0

    Distinctive

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Always CameraHelper the shadow camera when debugging shadow issues

    line 133

“Common” is measured: kept by at least 6 in 10 of the 17 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Three.js Lighting

Light Types

// Ambient — omnidirectional, no shadows
const ambient = new THREE.AmbientLight(0xffffff, 0.5); // color, intensity
scene.add(ambient);

// Hemisphere — sky/ground gradient
const hemi = new THREE.HemisphereLight(0x87ceeb, 0x8b7355, 0.5); // sky, ground, intensity
scene.add(hemi);

// Directional — parallel rays, simulates sun, supports shadows
const dir = new THREE.DirectionalLight(0xffffff, 1.5);
dir.position.set(5, 10, 5);
dir.castShadow = true;
scene.add(dir);

// Point — omnidirectional from a point, supports shadows
const point = new THREE.PointLight(0xff8800, 2, 20, 2); // color, intensity, distance, decay
point.position.set(0, 3, 0);
scene.add(point);

// Spot — cone of light, supports shadows
const spot = new THREE.SpotLight(0xffffff, 3, 30, Math.PI / 6, 0.3, 2);
// color, intensity, distance, angle, penumbra (softness), decay
spot.position.set(0, 10, 0);
spot.target.position.set(0, 0, 0);
scene.add(spot);
scene.add(spot.target);

// RectAreaLight — rectangular light source (like a panel), no shadows
const rectArea = new THREE.RectAreaLight(0xffffff, 5, 4, 2); // color, intensity, width, height
rectArea.position.set(0, 3, 5);
rectArea.lookAt(0, 0, 0);
scene.add(rectArea);
// RectAreaLight requires RectAreaLightUniformsLib
import { RectAreaLightUniformsLib } from "three/addons/lights/RectAreaLightUniformsLib.js";
RectAreaLightUniformsLib.init();

See SHADOWS.md for complete shadow configuration.

Shadow Setup

// 1. Enable renderer shadows
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap; // recommended

// 2. Light must castShadow
dir.castShadow = true;

// 3. Shadow map resolution (powers of 2)
dir.shadow.mapSize.set(2048, 2048); // default 512

// 4. Shadow camera frustum (DirectionalLight uses OrthographicCamera)
dir.shadow.camera.near = 0.5;
dir.shadow.camera.far = 50;
dir.shadow.camera.left = -10;
dir.shadow.camera.right = 10;
dir.shadow.camera.top = 10;
dir.shadow.camera.bottom = -10;

// 5. Bias — prevents shadow acne (peter-panning if too large)
dir.shadow.bias = -0.001;
dir.shadow.normalBias = 0.02; // better for curved surfaces

// 6. Mesh must castShadow and/or receiveShadow
mesh.castShadow = true;
ground.receiveShadow = true;

// Debug shadow camera
const helper = new THREE.CameraHelper(dir.shadow.camera);
scene.add(helper);

HDRI Environment Lighting

import { RGBELoader } from "three/addons/loaders/RGBELoader.js";

const pmrem = new THREE.PMREMGenerator(renderer);
pmrem.compileEquirectangularShader();

new RGBELoader().load("/env/studio.hdr", (hdr) => {
  const envMap = pmrem.fromEquirectangular(hdr).texture;
  scene.background = envMap; // visible background
  scene.environment = envMap; // applied to all PBR materials
  hdr.dispose();
  pmrem.dispose();
});

Light Intensity Scale

Three.js r155+ uses physical light units when renderer.useLegacyLights = false (default from r155):

// Physical units (r155+ default)
dir.intensity = 3; // lux for directional
point.intensity = 100; // candela for point/spot

// Legacy mode (pre-r155 behavior)
renderer.useLegacyLights = true; // restore old behavior

Light Helpers

scene.add(new THREE.DirectionalLightHelper(dir, 1));
scene.add(new THREE.PointLightHelper(point, 0.3));
scene.add(new THREE.SpotLightHelper(spot));
scene.add(new THREE.HemisphereLightHelper(hemi, 1));
// Update helpers that track targets:
spotHelper.update();

Common Gotchas

  • RectAreaLight does NOT cast shadows
  • AmbientLight and HemisphereLight do NOT cast shadows
  • SpotLight.target must be added to the scene separately
  • Shadow camera frustum must tightly wrap your scene — too large = blurry shadows
  • shadow.bias fixes acne but too negative causes peter-panning (shadow detaches)
  • Physical light units (r155+): multiply your old intensity values by ~π for similar results
  • Always CameraHelper the shadow camera when debugging shadow issues

Download now (ZIP)

  • Other versions18 projects use a version of this.

    Word for word · 0

    None found.

    Edited · 2

    1. caucy2026/skills★ 1100% same
    2. FkennedyFox/claude-skills★ 0100% same

    Wrote their own version · 16

    1. calesthio/OpenMontage★ 72ksame name
    2. CloudAI-X/threejs-skills★ 3.7ksame name
    3. educlopez/thegridcn-ui★ 390same name
    4. quiet-node/gesture-lab★ 185same name
    5. kumaran-is/claude-code-onboarding★ 35same name
    6. ruloCode/hermes-os★ 15same name
    7. LinHao-city/StoryMind★ 10same name
    8. chadixearth/graphyloop★ 3same name
    9. codetesla51/skills★ 3same name
    10. huangzida/skills★ 2same name

    6 more not listed

    How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.

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