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258 lines
7.3 KiB
258 lines
7.3 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - postprocessing manual ssaa</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Unbiased Manual Supersamling Anti-Aliasing (SSAA) pass by <a href="https://clara.io" target="_blank" rel="noopener">Ben Houston</a><br/><br/>
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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/>
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Turn off the "unbiased" feature to see the banding that results from accumulated rounding errors.
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</div>
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<div id="container"></div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
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import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';
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import { SSAARenderPass } from 'three/addons/postprocessing/SSAARenderPass.js';
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import { CopyShader } from 'three/addons/shaders/CopyShader.js';
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let scene, renderer, composer, copyPass;
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let cameraP, ssaaRenderPassP;
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let cameraO, ssaaRenderPassO;
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let gui, stats;
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const params = {
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sampleLevel: 4,
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renderToScreen: false,
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unbiased: true,
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camera: 'perspective',
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clearColor: 'black',
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clearAlpha: 1.0,
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viewOffsetX: 0,
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autoRotate: true
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};
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init();
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animate();
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clearGui();
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function clearGui() {
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if ( gui ) gui.destroy();
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gui = new GUI();
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gui.add( params, 'unbiased' );
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gui.add( params, 'renderToScreen' );
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gui.add( params, 'sampleLevel', {
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'Level 0: 1 Sample': 0,
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'Level 1: 2 Samples': 1,
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'Level 2: 4 Samples': 2,
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'Level 3: 8 Samples': 3,
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'Level 4: 16 Samples': 4,
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'Level 5: 32 Samples': 5
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} );
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gui.add( params, 'camera', [ 'perspective', 'orthographic' ] );
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gui.add( params, 'clearColor', [ 'black', 'white', 'blue', 'green', 'red' ] );
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gui.add( params, 'clearAlpha', 0, 1 );
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gui.add( params, 'viewOffsetX', - 100, 100 );
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gui.add( params, 'autoRotate' );
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gui.open();
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}
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function init() {
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const container = document.getElementById( 'container' );
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const width = window.innerWidth || 1;
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const height = window.innerHeight || 1;
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const aspect = width / height;
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const devicePixelRatio = window.devicePixelRatio || 1;
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( devicePixelRatio );
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renderer.setSize( width, height );
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document.body.appendChild( renderer.domElement );
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stats = new Stats();
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container.appendChild( stats.dom );
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cameraP = new THREE.PerspectiveCamera( 65, aspect, 3, 10 );
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cameraP.position.z = 7;
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cameraP.setViewOffset( width, height, params.viewOffsetX, 0, width, height );
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cameraO = new THREE.OrthographicCamera( width / - 2, width / 2, height / 2, height / - 2, 3, 10 );
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cameraO.position.z = 7;
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const fov = THREE.MathUtils.degToRad( cameraP.fov );
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const hyperfocus = ( cameraP.near + cameraP.far ) / 2;
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const _height = 2 * Math.tan( fov / 2 ) * hyperfocus;
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cameraO.zoom = height / _height;
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scene = new THREE.Scene();
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const group = new THREE.Group();
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scene.add( group );
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const light = new THREE.PointLight( 0xddffdd, 1.0 );
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light.position.z = 70;
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light.position.y = - 70;
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light.position.x = - 70;
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scene.add( light );
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const light2 = new THREE.PointLight( 0xffdddd, 1.0 );
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light2.position.z = 70;
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light2.position.x = - 70;
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light2.position.y = 70;
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scene.add( light2 );
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const light3 = new THREE.PointLight( 0xddddff, 1.0 );
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light3.position.z = 70;
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light3.position.x = 70;
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light3.position.y = - 70;
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scene.add( light3 );
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const light4 = new THREE.AmbientLight( 0xffffff, 0.05 );
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scene.add( light4 );
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const geometry = new THREE.SphereGeometry( 3, 48, 24 );
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for ( let i = 0; i < 120; i ++ ) {
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const material = new THREE.MeshStandardMaterial();
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material.roughness = 0.5 * Math.random() + 0.25;
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material.metalness = 0;
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material.color.setHSL( Math.random(), 1.0, 0.3 );
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const mesh = new THREE.Mesh( geometry, material );
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mesh.position.x = Math.random() * 4 - 2;
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mesh.position.y = Math.random() * 4 - 2;
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mesh.position.z = Math.random() * 4 - 2;
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mesh.rotation.x = Math.random();
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mesh.rotation.y = Math.random();
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mesh.rotation.z = Math.random();
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mesh.scale.setScalar( Math.random() * 0.2 + 0.05 );
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group.add( mesh );
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}
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// postprocessing
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composer = new EffectComposer( renderer );
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composer.setPixelRatio( 1 ); // ensure pixel ratio is always 1 for performance reasons
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ssaaRenderPassP = new SSAARenderPass( scene, cameraP );
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composer.addPass( ssaaRenderPassP );
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ssaaRenderPassO = new SSAARenderPass( scene, cameraO );
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composer.addPass( ssaaRenderPassO );
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copyPass = new ShaderPass( CopyShader );
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composer.addPass( copyPass );
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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const aspect = width / height;
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cameraP.aspect = aspect;
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cameraP.setViewOffset( width, height, params.viewOffset, 0, width, height );
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cameraO.updateProjectionMatrix();
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cameraO.left = - height * aspect;
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cameraO.right = height * aspect;
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cameraO.top = height;
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cameraO.bottom = - height;
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cameraO.updateProjectionMatrix();
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renderer.setSize( width, height );
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composer.setSize( width, height );
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}
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function animate() {
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requestAnimationFrame( animate );
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stats.begin();
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if ( params.autoRotate ) {
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for ( let i = 0; i < scene.children.length; i ++ ) {
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const child = scene.children[ i ];
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child.rotation.x += 0.005;
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child.rotation.y += 0.01;
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}
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}
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let newColor = ssaaRenderPassP.clearColor;
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switch ( params.clearColor ) {
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case 'blue': newColor = 0x0000ff; break;
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case 'red': newColor = 0xff0000; break;
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case 'green': newColor = 0x00ff00; break;
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case 'white': newColor = 0xffffff; break;
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case 'black': newColor = 0x000000; break;
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}
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ssaaRenderPassP.clearColor = ssaaRenderPassO.clearColor = newColor;
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ssaaRenderPassP.clearAlpha = ssaaRenderPassO.clearAlpha = params.clearAlpha;
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ssaaRenderPassP.sampleLevel = ssaaRenderPassO.sampleLevel = params.sampleLevel;
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ssaaRenderPassP.unbiased = ssaaRenderPassO.unbiased = params.unbiased;
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ssaaRenderPassP.enabled = ( params.camera === 'perspective' );
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ssaaRenderPassO.enabled = ( params.camera === 'orthographic' );
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copyPass.enabled = ! params.renderToScreen;
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cameraP.view.offsetX = params.viewOffsetX;
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composer.render();
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stats.end();
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}
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</script>
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</body>
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</html>
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