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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - postprocessing manual ssaa</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
- <link type="text/css" rel="stylesheet" href="main.css">
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Unbiased Manual Supersampling Anti-Aliasing (SSAA) pass by <a href="https://clara.io" target="_blank" rel="noopener">Ben Houston</a><br/><br/>
- This example shows how to unbias the rounding errors accumulated using high number of SSAA samples on a 8-bit per channel buffer.<br/><br/>
- Turn off the "unbiased" feature to see the banding that results from accumulated rounding errors.
- </div>
- <div id="container"></div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import Stats from 'three/addons/libs/stats.module.js';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
- import { SSAARenderPass } from 'three/addons/postprocessing/SSAARenderPass.js';
- import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';
- let scene, renderer, composer;
- let cameraP, ssaaRenderPassP;
- let cameraO, ssaaRenderPassO;
- let gui, stats;
- const params = {
- sampleLevel: 4,
- unbiased: true,
- camera: 'perspective',
- clearColor: 'black',
- clearAlpha: 1.0,
- viewOffsetX: 0,
- autoRotate: true
- };
- init();
- clearGui();
- function clearGui() {
- if ( gui ) gui.destroy();
- gui = new GUI();
- gui.add( params, 'unbiased' );
- gui.add( params, 'sampleLevel', {
- 'Level 0: 1 Sample': 0,
- 'Level 1: 2 Samples': 1,
- 'Level 2: 4 Samples': 2,
- 'Level 3: 8 Samples': 3,
- 'Level 4: 16 Samples': 4,
- 'Level 5: 32 Samples': 5
- } );
- gui.add( params, 'camera', [ 'perspective', 'orthographic' ] );
- gui.add( params, 'clearColor', [ 'black', 'white', 'blue', 'green', 'red' ] );
- gui.add( params, 'clearAlpha', 0, 1 );
- gui.add( params, 'viewOffsetX', - 100, 100 );
- gui.add( params, 'autoRotate' );
- gui.open();
- }
- function init() {
- const container = document.getElementById( 'container' );
- const width = window.innerWidth || 1;
- const height = window.innerHeight || 1;
- const aspect = width / height;
- const devicePixelRatio = window.devicePixelRatio || 1;
- renderer = new THREE.WebGLRenderer();
- renderer.setPixelRatio( devicePixelRatio );
- renderer.setSize( width, height );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- stats = new Stats();
- container.appendChild( stats.dom );
- cameraP = new THREE.PerspectiveCamera( 65, aspect, 3, 10 );
- cameraP.position.z = 7;
- cameraP.setViewOffset( width, height, params.viewOffsetX, 0, width, height );
- cameraO = new THREE.OrthographicCamera( width / - 2, width / 2, height / 2, height / - 2, 3, 10 );
- cameraO.position.z = 7;
- const fov = THREE.MathUtils.degToRad( cameraP.fov );
- const hyperfocus = ( cameraP.near + cameraP.far ) / 2;
- const _height = 2 * Math.tan( fov / 2 ) * hyperfocus;
- cameraO.zoom = height / _height;
- scene = new THREE.Scene();
- const group = new THREE.Group();
- scene.add( group );
- const light = new THREE.PointLight( 0xefffef, 500 );
- light.position.z = 10;
- light.position.y = - 10;
- light.position.x = - 10;
- scene.add( light );
- const light2 = new THREE.PointLight( 0xffefef, 500 );
- light2.position.z = 10;
- light2.position.x = - 10;
- light2.position.y = 10;
- scene.add( light2 );
- const light3 = new THREE.PointLight( 0xefefff, 500 );
- light3.position.z = 10;
- light3.position.x = 10;
- light3.position.y = - 10;
- scene.add( light3 );
- const light4 = new THREE.AmbientLight( 0xffffff, 0.2 );
- scene.add( light4 );
- const geometry = new THREE.SphereGeometry( 3, 48, 24 );
- for ( let i = 0; i < 120; i ++ ) {
- const material = new THREE.MeshStandardMaterial();
- material.roughness = 0.5 * Math.random() + 0.25;
- material.metalness = 0;
- material.color.setHSL( Math.random(), 1.0, 0.3 );
- const mesh = new THREE.Mesh( geometry, material );
- mesh.position.x = Math.random() * 4 - 2;
- mesh.position.y = Math.random() * 4 - 2;
- mesh.position.z = Math.random() * 4 - 2;
- mesh.rotation.x = Math.random();
- mesh.rotation.y = Math.random();
- mesh.rotation.z = Math.random();
- mesh.scale.setScalar( Math.random() * 0.2 + 0.05 );
- group.add( mesh );
- }
- // postprocessing
- composer = new EffectComposer( renderer );
- composer.setPixelRatio( 1 ); // ensure pixel ratio is always 1 for performance reasons
- ssaaRenderPassP = new SSAARenderPass( scene, cameraP );
- composer.addPass( ssaaRenderPassP );
- ssaaRenderPassO = new SSAARenderPass( scene, cameraO );
- composer.addPass( ssaaRenderPassO );
- const outputPass = new OutputPass();
- composer.addPass( outputPass );
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- const aspect = width / height;
- cameraP.aspect = aspect;
- cameraP.setViewOffset( width, height, params.viewOffsetX, 0, width, height );
- cameraO.updateProjectionMatrix();
- cameraO.left = - height * aspect;
- cameraO.right = height * aspect;
- cameraO.top = height;
- cameraO.bottom = - height;
- cameraO.updateProjectionMatrix();
- renderer.setSize( width, height );
- composer.setSize( width, height );
- }
- function animate() {
- stats.begin();
- if ( params.autoRotate ) {
- for ( let i = 0; i < scene.children.length; i ++ ) {
- const child = scene.children[ i ];
- child.rotation.x += 0.005;
- child.rotation.y += 0.01;
- }
- }
- let newColor = ssaaRenderPassP.clearColor;
- switch ( params.clearColor ) {
- case 'blue': newColor = 0x0000ff; break;
- case 'red': newColor = 0xff0000; break;
- case 'green': newColor = 0x00ff00; break;
- case 'white': newColor = 0xffffff; break;
- case 'black': newColor = 0x000000; break;
- }
- ssaaRenderPassP.clearColor = ssaaRenderPassO.clearColor = newColor;
- ssaaRenderPassP.clearAlpha = ssaaRenderPassO.clearAlpha = params.clearAlpha;
- ssaaRenderPassP.sampleLevel = ssaaRenderPassO.sampleLevel = params.sampleLevel;
- ssaaRenderPassP.unbiased = ssaaRenderPassO.unbiased = params.unbiased;
- ssaaRenderPassP.enabled = ( params.camera === 'perspective' );
- ssaaRenderPassO.enabled = ( params.camera === 'orthographic' );
- cameraP.view.offsetX = params.viewOffsetX;
- composer.render();
- stats.end();
- }
- </script>
- </body>
- </html>
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