javascript
/
three.js
réplica de https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>

<!--Reference: 
SSAO algo: http://devlog-martinsh.blogspot.tw/2011/12/ssao-shader-update-v12.html?showComment=1398158188712#c1563204765906693531
log depth http://outerra.blogspot.tw/2013/07/logarithmic-depth-buffer-optimizations.html
convert the exponential depth to a linear value: http://www.ozone3d.net/blogs/lab/20090206/how-to-linearize-the-depth-value/
Spiral sampling http://web.archive.org/web/20120421191837/http://www.cgafaq.info/wiki/Evenly_distributed_points_on_sphere-->

<html lang="en">
    <head>
        <title>three.js webgl - postprocessing - Screen Space Ambient Occlusion</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
        <style>
            body {
                background-color: #000000;
                margin: 0px;
                overflow: hidden;
                font-family:Monospace;
                font-size:13px;
                text-align:center;
                font-weight: bold;
            }

            a {
                color:#0078ff;
            }

            #info {
                color:#fff;
                position: relative;
                top: 0px;
                width: 50em;
                margin: 0 auto -2.1em;
                padding: 5px;
                z-index:100;
            }
        </style>
    </head>
    <body>
        <script src="../build/three.js"></script>
        <script src="js/shaders/SSAOShader.js"></script>
        <script src="js/Detector.js"></script>
        <script src="js/libs/stats.min.js"></script>
        <script src='js/libs/dat.gui.min.js'></script>

        <div id="info">
            <a href="http://threejs.org" target="_blank">three.js</a> - webgl screen space ambient occlusion example -
            shader by <a href="http://alteredqualia.com">alteredq</a>
        </div>

        <script>

            if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
                        
            var container, stats;   
            var camera, scene, renderer,
                depthMaterial;
            var group;
            var depthScale = 1.0;
            var height = window.innerHeight;
            var postprocessing = { enabled : true, renderMode: 'framebuffer' }; // renderMode: 'framebuffer', 'onlyAO'

            init();
            animate();

            function init() {

                container = document.createElement( 'div' );
                document.body.appendChild( container );

                renderer = new THREE.WebGLRenderer( { antialias: false } );
                renderer.setClearColor( 0xa0a0a0 );

                renderer.setSize( window.innerWidth, window.innerHeight );
                document.body.appendChild( renderer.domElement );
                var depthShader = THREE.ShaderLib[ "depthRGBA" ];
                var depthUniforms = THREE.UniformsUtils.clone( depthShader.uniforms );

                depthMaterial = new THREE.ShaderMaterial( { fragmentShader: depthShader.fragmentShader, vertexShader: depthShader.vertexShader,
                    uniforms: depthUniforms, blending: THREE.NoBlending } );
                                
                camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 100, 700 );
                camera.position.z = 500;

                scene = new THREE.Scene();

                group = new THREE.Object3D();
                scene.add( group );

                var directionalLight = new THREE.DirectionalLight( 0xffffff, 1 );
                directionalLight.position.set( 2, 1.2, 10 ).normalize();
                scene.add( directionalLight );
                
                var geometry = new THREE.SphereBufferGeometry(5, 100, 100); //new THREE.BoxGeometry( 10, 10, 10 );
                for ( var i = 0; i < 100; i ++ ) {
                
                    //var material = new THREE.MeshLambertMaterial({color: 0xaa0000});  //new 
                    var material = new THREE.MeshBasicMaterial();
                    material.color.r = Math.random();
                    material.color.g = Math.random();
                    material.color.b = Math.random();
                   
                    var mesh = new THREE.Mesh( geometry, material );
                    mesh.position.x = Math.random() * 400 - 200;
                    mesh.position.y = Math.random() * 400 - 200;
                    mesh.position.z = Math.random() * 400 - 200;
                    mesh.rotation.x = Math.random();
                    mesh.rotation.y = Math.random();
                    mesh.rotation.z = Math.random();

                    mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 10 + 1;
                    group.add( mesh );
                }
                
                stats = new Stats();
                stats.domElement.style.position = 'absolute';
                stats.domElement.style.top = '0px';
                container.appendChild( stats.domElement );

                // postprocessing                
                initPostprocessing();
            
                // Init gui
                var gui = new dat.GUI();
                gui.add( postprocessing, "enabled" ).onChange();
                // gui.add( postprocessing, "type" ).onChange( postprocessChange );
                gui.add( postprocessing, "renderMode", { framebuffer: 0, onlyAO: 1 } ).onChange( renderModeChange ).listen();

                window.addEventListener( 'resize', onWindowResize, false );
            }

            function renderModeChange( value ) {

                if ( value == 0 ) {    // framebuffer
                    postprocessing.ssao_uniforms[ 'onlyAO' ].value = false;
                } else if ( value == 1 ) { // onlyAO
                    postprocessing.ssao_uniforms[ 'onlyAO' ].value = true;
                } else {
                    console.error( "Not define renderModeChange type: " + value );
                }
            }
            
            function onWindowResize() {

                camera.aspect = window.innerWidth / window.innerHeight;
                camera.updateProjectionMatrix();
                renderer.setSize( window.innerWidth, window.innerHeight );
            }

            function initPostprocessing() {
                
                postprocessing.scene = new THREE.Scene();
                postprocessing.camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2,  window.innerHeight / 2, window.innerHeight / - 2, -1000, 1000 );
                postprocessing.camera.position.z = 1;                
                
                postprocessing.scene.add( postprocessing.camera );
                
                var pars = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter };
                postprocessing.rtTextureDepth = new THREE.WebGLRenderTarget( window.innerWidth * depthScale, height * depthScale, pars );
                postprocessing.rtTextureColor = new THREE.WebGLRenderTarget( window.innerWidth, height, pars );

                // Setup SSAO material
                var ssao_shader = THREE.SSAOShader;
                postprocessing.ssao_uniforms = THREE.UniformsUtils.clone( ssao_shader.uniforms );
                postprocessing.ssao_uniforms[ "tDiffuse" ].value = postprocessing.rtTextureColor; 
                postprocessing.ssao_uniforms[ "tDepth" ].value = postprocessing.rtTextureDepth; 
                postprocessing.ssao_uniforms[ 'size' ].value.set( window.innerWidth*depthScale, window.innerHeight*depthScale );
                postprocessing.ssao_uniforms[ 'cameraNear' ].value = camera.near;
                postprocessing.ssao_uniforms[ 'cameraFar' ].value = camera.far;
                postprocessing.ssao_uniforms[ 'onlyAO' ].value = false;
                
                postprocessing.materialSSAO = new THREE.ShaderMaterial( {
                    
                    uniforms: postprocessing.ssao_uniforms,
                    vertexShader: ssao_shader.vertexShader,
                    fragmentShader: ssao_shader.fragmentShader
                });
                
                postprocessing.ssaoQuad = new THREE.Mesh( new THREE.PlaneBufferGeometry( window.innerWidth, window.innerHeight ), postprocessing.materialSSAO );
                postprocessing.ssaoQuad.position.z = -500;
                postprocessing.scene.add( postprocessing.ssaoQuad );
            }
            
            function shaderUpdate() {
                postprocessing.materialSSAO.needsUpdate = true;
            }
            
            function animate() {
                requestAnimationFrame( animate );

                render();
                stats.update();
            }

            function render() {                                
                var timer = performance.now();
                group.rotation.x = timer * 0.0002;
                group.rotation.y = timer * 0.0001;

                if ( postprocessing.enabled ) {
                    
                    renderer.clear();

                    // Render scene into texture
                    scene.overrideMaterial = null;
                    renderer.render( scene, camera, postprocessing.rtTextureColor , true );

                    // Render depth into texture                    
                    scene.overrideMaterial = depthMaterial;
                    renderer.render( scene, camera, postprocessing.rtTextureDepth, true );

                    // Render SSAO composite
                    renderer.render( postprocessing.scene, postprocessing.camera );
                    
                } else {
                    
                    scene.overrideMaterial = null;
                    renderer.clear();
                    renderer.render( scene, camera );
                }
            }
            
        </script>
    </body>
</html>