threejs-postprocessing

Q: How do I install threejs-postprocessing?

Run npx skills add https://github.com/calesthio/openmontage --skill threejs-postprocessing in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/threejs-postprocessing/ (personal) or .claude/skills/threejs-postprocessing/ (project).

by calesthio

Three.js post-processing - EffectComposer, bloom, DOF, screen effects. Use when adding visual effects, color grading, blur, glow, or creating custom screen-space shaders.

Installs: 1.1K
Last 24h: +12
Trending rank: #7945
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/calesthio/openmontage --skill threejs-postprocessing

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads threejs-postprocessing automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Three.js Post-Processing

Quick Start

import * as THREE from "three";
import { EffectComposer } from "three/addons/postprocessing/EffectComposer.js";
import { RenderPass } from "three/addons/postprocessing/RenderPass.js";
import { UnrealBloomPass } from "three/addons/postprocessing/UnrealBloomPass.js";

// Setup composer
const composer = new EffectComposer(renderer);

// Render scene
const renderPass = new RenderPass(scene, camera);
composer.addPass(renderPass);

// Add bloom
const bloomPass = new UnrealBloomPass(
  new THREE.Vector2(window.innerWidth, window.innerHeight),
  1.5, // strength
  0.4, // radius
  0.85, // threshold
);
composer.addPass(bloomPass);

// Animation loop - use composer instead of renderer
function animate() {
  requestAnimationFrame(animate);
  composer.render(); // NOT renderer.render()
}

EffectComposer Setup

import { EffectComposer } from "three/addons/postprocessing/EffectComposer.js";
import { RenderPass } from "three/addons/postprocessing/RenderPass.js";

const composer = new EffectComposer(renderer);

// First pass: render scene
const renderPass = new RenderPass(scene, camera);
composer.addPass(renderPass);

// Add more passes...
composer.addPass(effectPass);

// Last pass should render to screen
effectPass.renderToScreen = true; // Default for last pass

// Handle resize
function onResize() {
  const width = window.innerWidth;
  const height = window.innerHeight;

  camera.aspect = width / height;
  camera.updateProjectionMatrix();

  renderer.setSize(width, height);
  composer.setSize(width, height);
}

Common Effects

Bloom (Glow)

import { UnrealBloomPass } from "three/addons/postprocessing/UnrealBloomPass.js";

const bloomPass = new UnrealBloomPass(
  new THREE.Vector2(window.innerWidth, window.innerHeight),
  1.5, // strength - intensity of glow
  0.4, // radius - spread of glow
  0.85, // threshold - brightness threshold
);

composer.addPass(bloomPass);

// Adjust at runtime
bloomPass.strength = 2.0;
bloomPass.threshold = 0.5;
bloomPass.radius = 0.8;

Selective Bloom

Apply bloom only to specific objects.

import { UnrealBloomPass } from "three/addons/postprocessing/UnrealBloomPass.js";
import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";

// Layer setup
const BLOOM_LAYER = 1;
const bloomLayer = new THREE.Layers();
bloomLayer.set(BLOOM_LAYER);

// Mark objects to bloom
glowingMesh.layers.enable(BLOOM_LAYER);

// Dark material for non-blooming objects
const darkMaterial = new THREE.MeshBasicMaterial({ color: 0x000000 });
const materials = {};

function darkenNonBloomed(obj) {
  if (obj.isMesh && !bloomLayer.test(obj.layers)) {
    materials[obj.uuid] = obj.material;
    obj.material = darkMaterial;
  }
}

function restoreMaterial(obj) {
  if (materials[obj.uuid]) {
    obj.material = materials[obj.uuid];
    delete materials[obj.uuid];
  }
}

// Custom render loop
function render() {
  // Render bloom pass
  scene.traverse(darkenNonBloomed);
  composer.render();
  scene.traverse(restoreMaterial);

  // Render final scene over bloom
  renderer.render(scene, camera);
}

FXAA (Anti-Aliasing)

import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";
import { FXAAShader } from "three/addons/shaders/FXAAShader.js";

const fxaaPass = new ShaderPass(FXAAShader);
fxaaPass.material.uniforms["resolution"].value.set(
  1 / window.innerWidth,
  1 / window.innerHeight,
);

composer.addPass(fxaaPass);

// Update on resize
function onResize() {
  fxaaPass.material.uniforms["resolution"].value.set(
    1 / window.innerWidth,
    1 / window.innerHeight,
  );
}

SMAA (Better Anti-Aliasing)

import { SMAAPass } from "three/addons/postprocessing/SMAAPass.js";

const smaaPass = new SMAAPass(
  window.innerWidth * renderer.getPixelRatio(),
  window.innerHeight * renderer.getPixelRatio(),
);

composer.addPass(smaaPass);

SSAO (Ambient Occlusion)

import { SSAOPass } from "three/addons/postprocessing/SSAOPass.js";

const ssaoPass = new SSAOPass(
  scene,
  camera,
  window.innerWidth,
  window.innerHeight,
);
ssaoPass.kernelRadius = 16;
ssaoPass.minDistance = 0.005;
ssaoPass.maxDistance = 0.1;

composer.addPass(ssaoPass);

// Output modes
ssaoPass.output = SSAOPass.OUTPUT.Default;
// SSAOPass.OUTPUT.Default - Final composited output
// SSAOPass.OUTPUT.SSAO - Just the AO
// SSAOPass.OUTPUT.Blur - Blurred AO
// SSAOPass.OUTPUT.Depth - Depth buffer
// SSAOPass.OUTPUT.Normal - Normal buffer

Depth of Field (DOF)

import { BokehPass } from "three/addons/postprocessing/BokehPass.js";

const bokehPass = new BokehPass(scene, camera, {
  focus: 10.0, // Focus distance
  aperture: 0.025, // Aperture (smaller = more DOF)
  maxblur: 0.01, // Max blur amount
});

composer.addPass(bokehPass);

// Update focus dynamically
bokehPass.uniforms["focus"].value = distanceToTarget;

Film Grain

import { FilmPass } from "three/addons/postprocessing/FilmPass.js";

const filmPass = new FilmPass(
  0.35, // noise intensity
  0.5, // scanline intensity
  648, // scanline count
  false, // grayscale
);

composer.addPass(filmPass);

Vignette

import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";
import { VignetteShader } from "three/addons/shaders/VignetteShader.js";

const vignettePass = new ShaderPass(VignetteShader);
vignettePass.uniforms["offset"].value = 1.0; // Vignette size
vignettePass.uniforms["darkness"].value = 1.0; // Vignette intensity

composer.addPass(vignettePass);

Color Correction

import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";
import { ColorCorrectionShader } from "three/addons/shaders/ColorCorrectionShader.js";

const colorPass = new ShaderPass(ColorCorrectionShader);
colorPass.uniforms["powRGB"].value = new THREE.Vector3(1.2, 1.2, 1.2); // Power
colorPass.uniforms["mulRGB"].value = new THREE.Vector3(1.0, 1.0, 1.0); // Multiply

composer.addPass(colorPass);

Gamma Correction

import { GammaCorrectionShader } from "three/addons/shaders/GammaCorrectionShader.js";

const gammaPass = new ShaderPass(GammaCorrectionShader);
composer.addPass(gammaPass);

Pixelation

import { RenderPixelatedPass } from "three/addons/postprocessing/RenderPixelatedPass.js";

const pixelPass = new RenderPixelatedPass(6, scene, camera); // 6 = pixel size

composer.addPass(pixelPass);

Glitch Effect

import { GlitchPass } from "three/addons/postprocessing/GlitchPass.js";

const glitchPass = new GlitchPass();
glitchPass.goWild = false; // Continuous glitching

composer.addPass(glitchPass);

Halftone

import { HalftonePass } from "three/addons/postprocessing/HalftonePass.js";

const halftonePass = new HalftonePass(window.innerWidth, window.innerHeight, {
  shape: 1, // 1 = dot, 2 = ellipse, 3 = line, 4 = square
  radius: 4, // Dot size
  rotateR: Math.PI / 12,
  rotateB: (Math.PI / 12) * 2,
  rotateG: (Math.PI / 12) * 3,
  scatter: 0,
  blending: 1,
  blendingMode: 1,
  greyscale: false,
});

composer.addPass(halftonePass);

Outline

import { OutlinePass } from "three/addons/postprocessing/OutlinePass.js";

const outlinePass = new OutlinePass(
  new THREE.Vector2(window.innerWidth, window.innerHeight),
  scene,
  camera,
);

outlinePass.edgeStrength = 3;
outlinePass.edgeGlow = 0;
outlinePass.edgeThickness = 1;
outlinePass.pulsePeriod = 0;
outlinePass.visibleEdgeColor.set(0xffffff);
outlinePass.hiddenEdgeColor.set(0x190a05);

// Select objects to outline
outlinePass.selectedObjects = [mesh1, mesh2];

composer.addPass(outlinePass);

Custom ShaderPass

Create your own post-processing effects.

import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";

const CustomShader = {
  uniforms: {
    tDiffuse: { value: null }, // Required: input texture
    time: { value: 0 },
    intensity: { value: 1.0 },
  },
  vertexShader: `
    varying vec2 vUv;

    void main() {
      vUv = uv;
      gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
  `,
  fragmentShader: `
    uniform sampler2D tDiffuse;
    uniform float time;
    uniform float intensity;
    varying vec2 vUv;

    void main() {
      vec2 uv = vUv;

      // Wave distortion
      uv.x += sin(uv.y * 10.0 + time) * 0.01 * intensity;

      vec4 color = texture2D(tDiffuse, uv);
      gl_FragColor = color;
    }
  `,
};

const customPass = new ShaderPass(CustomShader);
composer.addPass(customPass);

// Update in animation loop
customPass.uniforms.time.value = clock.getElapsedTime();

Invert Colors Shader

const InvertShader = {
  uniforms: {
    tDiffuse: { value: null },
  },
  vertexShader: `
    varying vec2 vUv;
    void main() {
      vUv = uv;
      gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
  `,
  fragmentShader: `
    uniform sampler2D tDiffuse;
    varying vec2 vUv;

    void main() {
      vec4 color = texture2D(tDiffuse, vUv);
      gl_FragColor = vec4(1.0 - color.rgb, color.a);
    }
  `,
};

Chromatic Aberration

const ChromaticAberrationShader = {
  uniforms: {
    tDiffuse: { value: null },
    amount: { value: 0.005 },
  },
  vertexShader: `
    varying vec2 vUv;
    void main() {
      vUv = uv;
      gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
  `,
  fragmentShader: `
    uniform sampler2D tDiffuse;
    uniform float amount;
    varying vec2 vUv;

    void main() {
      vec2 dir = vUv - 0.5;
      float dist = length(dir);

      float r = texture2D(tDiffuse, vUv - dir * amount * dist).r;
      float g = texture2D(tDiffuse, vUv).g;
      float b = texture2D(tDiffuse, vUv + dir * amount * dist).b;

      gl_FragColor = vec4(r, g, b, 1.0);
    }
  `,
};

Combining Multiple Effects

import { EffectComposer } from "three/addons/postprocessing/EffectComposer.js";
import { RenderPass } from "three/addons/postprocessing/RenderPass.js";
import { UnrealBloomPass } from "three/addons/postprocessing/UnrealBloomPass.js";
import { ShaderPass } from "three/addons/postprocessing/ShaderPass.js";
import { FXAAShader } from "three/addons/shaders/FXAAShader.js";
import { VignetteShader } from "three/addons/shaders/VignetteShader.js";
import { GammaCorrectionShader } from "three/addons/shaders/GammaCorrectionShader.js";

const composer = new EffectComposer(renderer);

// 1. Render scene
composer.addPass(new RenderPass(scene, camera));

// 2. Bloom
const bloomPass = new UnrealBloomPass(
  new THREE.Vector2(window.innerWidth, window.innerHeight),
  0.5,
  0.4,
  0.85,
);
composer.addPass(bloomPass);

// 3. Vignette
const vignettePass = new ShaderPass(VignetteShader);
vignettePass.uniforms["offset"].value = 0.95;
vignettePass.uniforms["darkness"].value = 1.0;
composer.addPass(vignettePass);

// 4. Gamma correction
composer.addPass(new ShaderPass(GammaCorrectionShader));

// 5. Anti-aliasing (always last before output)
const fxaaPass = new ShaderPass(FXAAShader);
fxaaPass.uniforms["resolution"].value.set(
  1 / window.innerWidth,
  1 / window.innerHeight,
);
composer.addPass(fxaaPass);

Render to Texture

// Create render target
const renderTarget = new THREE.WebGLRenderTarget(512, 512);

// Render scene to target
renderer.setRenderTarget(renderTarget);
renderer.render(scene, camera);
renderer.setRenderTarget(null);

// Use texture
const texture = renderTarget.texture;
otherMaterial.map = texture;

Multi-Pass Rendering

// Multiple composers for different scenes/layers
const bgComposer = new EffectComposer(renderer);
bgComposer.addPass(new RenderPass(bgScene, camera));

const fgComposer = new EffectComposer(renderer);
fgComposer.addPass(new RenderPass(fgScene, camera));
fgComposer.addPass(bloomPass);

// Combine in render loop
function animate() {
  // Render background without clearing
  renderer.autoClear = false;
  renderer.clear();

  bgComposer.render();

  // Render foreground over it
  renderer.clearDepth();
  fgComposer.render();
}

WebGPU Post-Processing (Three.js r150+)

import { postProcessing } from "three/addons/nodes/Nodes.js";
import { pass, bloom, dof } from "three/addons/nodes/Nodes.js";

// Using node-based system
const scenePass = pass(scene, camera);
const bloomNode = bloom(scenePass, 0.5, 0.4, 0.85);

const postProcessing = new THREE.PostProcessing(renderer);
postProcessing.outputNode = bloomNode;

// Render
function animate() {
  postProcessing.render();
}

Performance Tips

Limit passes: Each pass adds a full-screen render
Lower resolution: Use smaller render targets for blur passes
Disable unused effects: Toggle passes on/off
Use FXAA over MSAA: Less expensive anti-aliasing
Profile with DevTools: Check GPU usage

// Disable pass
bloomPass.enabled = false;

// Reduce bloom resolution
const bloomPass = new UnrealBloomPass(
  new THREE.Vector2(window.innerWidth / 2, window.innerHeight / 2),
  strength,
  radius,
  threshold,
);

// Only apply effects in high-performance scenarios
const isMobile = /iPhone|iPad|Android/i.test(navigator.userAgent);
if (!isMobile) {
  composer.addPass(expensivePass);
}

Handle Resize

function onWindowResize() {
  const width = window.innerWidth;
  const height = window.innerHeight;
  const pixelRatio = renderer.getPixelRatio();

  camera.aspect = width / height;
  camera.updateProjectionMatrix();

  renderer.setSize(width, height);
  composer.setSize(width, height);

  // Update pass-specific resolutions
  if (fxaaPass) {
    fxaaPass.material.uniforms["resolution"].value.set(
      1 / (width * pixelRatio),
      1 / (height * pixelRatio),
    );
  }

  if (bloomPass) {
    bloomPass.resolution.set(width, height);
  }
}

window.addEventListener("resize", onWindowResize);

FAQ

What does the threejs-postprocessing skill do?

Three.js post-processing - EffectComposer, bloom, DOF, screen effects. Use when adding visual effects, color grading, blur, glow, or creating custom screen-space shaders.

How do I install threejs-postprocessing?

Run npx skills add https://github.com/calesthio/openmontage --skill threejs-postprocessing in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/threejs-postprocessing/ (personal) or .claude/skills/threejs-postprocessing/ (project).

Which AI agents can use threejs-postprocessing?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is threejs-postprocessing safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains threejs-postprocessing?

It is published by calesthio in calesthio/openmontage. It has 1,058 recorded installs.

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threejs-postprocessing

Install

Install

Describe the task

Review the result

SKILL.md

Three.js Post-Processing

Quick Start

EffectComposer Setup

Common Effects

Bloom (Glow)

Selective Bloom

FXAA (Anti-Aliasing)

SMAA (Better Anti-Aliasing)

SSAO (Ambient Occlusion)

Depth of Field (DOF)

Film Grain

Vignette

Color Correction

Gamma Correction

Pixelation

Glitch Effect

Halftone

Outline

Custom ShaderPass

Invert Colors Shader

Chromatic Aberration

Combining Multiple Effects

Render to Texture

Multi-Pass Rendering

WebGPU Post-Processing (Three.js r150+)

Performance Tips

Handle Resize

See Also

FAQ

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