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+<!DOCTYPE html>
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+
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+<!--Reference:
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+SSAO algo: http://devlog-martinsh.blogspot.tw/2011/12/ssao-shader-update-v12.html?showComment=1398158188712#c1563204765906693531
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+log depth http://outerra.blogspot.tw/2013/07/logarithmic-depth-buffer-optimizations.html
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+convert the exponential depth to a linear value: http://www.ozone3d.net/blogs/lab/20090206/how-to-linearize-the-depth-value/
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+Spiral sampling http://web.archive.org/web/20120421191837/http://www.cgafaq.info/wiki/Evenly_distributed_points_on_sphere-->
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+
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - postprocessing - Screen Space Ambient Occlusion</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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+ <style>
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+ body {
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+ background-color: #000000;
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+ margin: 0px;
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+ overflow: hidden;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+ font-weight: bold;
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+ }
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+
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+ a {
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+ color:#0078ff;
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+ }
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+
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+ #info {
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+ color:#fff;
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+ position: relative;
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+ top: 0px;
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+ width: 50em;
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+ margin: 0 auto -2.1em;
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+ padding: 5px;
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+ z-index:100;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <script src="../build/three.js"></script>
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+ <script src="js/shaders/SSAOShader.js"></script>
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+ <script src="js/Detector.js"></script>
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+ <script src="js/libs/stats.min.js"></script>
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+ <script src='js/libs/dat.gui.min.js'></script>
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+
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+ <div id="info">
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+ <a href="http://threejs.org" target="_blank">three.js</a> - webgl screen space ambient occlusion example -
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+ shader by <a href="http://alteredqualia.com">alteredq</a>
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+ </div>
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+
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+ <script>
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+
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+ if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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+
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+ var container, stats;
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+ var camera, scene, renderer,
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+ depthMaterial;
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+ var group;
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+ var depthScale = 1.0;
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+ var height = window.innerHeight;
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+ var postprocessing = { enabled : true, renderMode: 'framebuffer' }; // renderMode: 'framebuffer', 'onlyAO'
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: false } );
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+ renderer.setClearColor( 0xa0a0a0 );
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ document.body.appendChild( renderer.domElement );
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+ var depthShader = THREE.ShaderLib[ "depthRGBA" ];
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+ var depthUniforms = THREE.UniformsUtils.clone( depthShader.uniforms );
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+
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+ depthMaterial = new THREE.ShaderMaterial( { fragmentShader: depthShader.fragmentShader, vertexShader: depthShader.vertexShader,
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+ uniforms: depthUniforms, blending: THREE.NoBlending } );
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+
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+ camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 100, 700 );
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+ camera.position.z = 500;
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+
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+ scene = new THREE.Scene();
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+
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+ group = new THREE.Object3D();
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+ scene.add( group );
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+
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+ var directionalLight = new THREE.DirectionalLight( 0xffffff, 1 );
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+ directionalLight.position.set( 2, 1.2, 10 ).normalize();
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+ scene.add( directionalLight );
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+
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+ var geometry = new THREE.SphereBufferGeometry(5, 100, 100); //new THREE.BoxGeometry( 10, 10, 10 );
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+ for ( var i = 0; i < 100; i ++ ) {
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+
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+ //var material = new THREE.MeshLambertMaterial({color: 0xaa0000}); //new
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+ var material = new THREE.MeshBasicMaterial();
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+ material.color.r = Math.random();
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+ material.color.g = Math.random();
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+ material.color.b = Math.random();
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+
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+ var mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.x = Math.random() * 400 - 200;
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+ mesh.position.y = Math.random() * 400 - 200;
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+ mesh.position.z = Math.random() * 400 - 200;
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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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+
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+ mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 10 + 1;
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+ group.add( mesh );
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+ }
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ container.appendChild( stats.domElement );
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+
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+ // postprocessing
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+ initPostprocessing();
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+
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+ // Init gui
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+ var gui = new dat.GUI();
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+ gui.add( postprocessing, "enabled" ).onChange();
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+ // gui.add( postprocessing, "type" ).onChange( postprocessChange );
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+ gui.add( postprocessing, "renderMode", { framebuffer: 0, onlyAO: 1 } ).onChange( renderModeChange ).listen();
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+ }
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+
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+ function renderModeChange( value ) {
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+
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+ if ( value == 0 ) { // framebuffer
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+ postprocessing.ssao_uniforms[ 'onlyAO' ].value = false;
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+ } else if ( value == 1 ) { // onlyAO
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+ postprocessing.ssao_uniforms[ 'onlyAO' ].value = true;
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+ } else {
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+ console.error( "Not define renderModeChange type: " + value );
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+ }
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ }
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+
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+ function initPostprocessing() {
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+
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+ postprocessing.scene = new THREE.Scene();
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+ postprocessing.camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, -1000, 1000 );
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+ postprocessing.camera.position.z = 1;
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+
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+ postprocessing.scene.add( postprocessing.camera );
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+
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+ var pars = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter };
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+ postprocessing.rtTextureDepth = new THREE.WebGLRenderTarget( window.innerWidth * depthScale, height * depthScale, pars );
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+ postprocessing.rtTextureColor = new THREE.WebGLRenderTarget( window.innerWidth, height, pars );
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+
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+ // Setup SSAO material
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+ var ssao_shader = THREE.SSAOShader;
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+ postprocessing.ssao_uniforms = THREE.UniformsUtils.clone( ssao_shader.uniforms );
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+ postprocessing.ssao_uniforms[ "tDiffuse" ].value = postprocessing.rtTextureColor;
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+ postprocessing.ssao_uniforms[ "tDepth" ].value = postprocessing.rtTextureDepth;
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+ postprocessing.ssao_uniforms[ 'size' ].value.set( window.innerWidth*depthScale, window.innerHeight*depthScale );
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+ postprocessing.ssao_uniforms[ 'cameraNear' ].value = camera.near;
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+ postprocessing.ssao_uniforms[ 'cameraFar' ].value = camera.far;
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+ postprocessing.ssao_uniforms[ 'onlyAO' ].value = false;
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+
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+ postprocessing.materialSSAO = new THREE.ShaderMaterial( {
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+
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+ uniforms: postprocessing.ssao_uniforms,
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+ vertexShader: ssao_shader.vertexShader,
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+ fragmentShader: ssao_shader.fragmentShader
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+ });
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+
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+ postprocessing.ssaoQuad = new THREE.Mesh( new THREE.PlaneBufferGeometry( window.innerWidth, window.innerHeight ), postprocessing.materialSSAO );
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+ postprocessing.ssaoQuad.position.z = -500;
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+ postprocessing.scene.add( postprocessing.ssaoQuad );
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+ }
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+
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+ function shaderUpdate() {
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+ postprocessing.materialSSAO.needsUpdate = true;
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+ }
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+
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+ function animate() {
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+ requestAnimationFrame( animate );
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+
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+ render();
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+ stats.update();
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+ }
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+
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+ function render() {
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+ var timer = performance.now();
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+ group.rotation.x = timer * 0.0002;
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+ group.rotation.y = timer * 0.0001;
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+
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+ if ( postprocessing.enabled ) {
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+
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+ renderer.clear();
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+
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+ // Render scene into texture
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+ scene.overrideMaterial = null;
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+ renderer.render( scene, camera, postprocessing.rtTextureColor , true );
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+
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+ // Render depth into texture
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+ scene.overrideMaterial = depthMaterial;
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+ renderer.render( scene, camera, postprocessing.rtTextureDepth, true );
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+
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+ // Render SSAO composite
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+ renderer.render( postprocessing.scene, postprocessing.camera );
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+
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+ } else {
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+
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+ scene.overrideMaterial = null;
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+ renderer.clear();
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+ renderer.render( scene, camera );
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+ }
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+ }
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+
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+ </script>
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+ </body>
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+</html>
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Daosheng Mu