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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 - percent closer soft-shadows</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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+ font-family: Monospace;
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+ background-color: #000;
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+ color: #000;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ padding: 10px;
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+ width: 100%;
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+ text-align: center;
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+ }
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+
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+ a {
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+ text-decoration: underline;
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+ cursor: pointer;
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+ }
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+
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+ </style>
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+ </head>
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+
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+ <body>
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+ <div id="info">Percent Closer Soft-Shadows (PCSS) by <a href="http://eduperiment.com">spidersharma03</a></div>
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+
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+ <script src="../build/three.js"></script>
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+
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+ <script src="js/Detector.js"></script>
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+ <script src="js/controls/OrbitControls.js"></script>
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+ <script src="js/libs/stats.min.js"></script>
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+
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+ <script type="x-shader/x-fragment" id="PCSS">
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+
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+ #define LIGHT_WORLD_SIZE 0.005
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+ #define LIGHT_FRUSTUM_WIDTH 3.75
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+ #define LIGHT_SIZE_UV (LIGHT_WORLD_SIZE / LIGHT_FRUSTUM_WIDTH)
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+ #define NEAR_PLANE 9.5
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+
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+ #define NUM_SAMPLES 17
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+ #define NUM_RINGS 11
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+ #define BLOCKER_SEARCH_NUM_SAMPLES NUM_SAMPLES
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+ #define PCF_NUM_SAMPLES NUM_SAMPLES
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+
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+ vec2 poissonDisk[NUM_SAMPLES];
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+
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+ void initPoissonSamples( const in vec2 randomSeed ) {
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+ float ANGLE_STEP = PI2 * float( NUM_RINGS ) / float( NUM_SAMPLES );
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+ float INV_NUM_SAMPLES = 1.0 / float( NUM_SAMPLES );
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+
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+ // jsfiddle that shows sample pattern: https://jsfiddle.net/a16ff1p7/
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+ float angle = rand( randomSeed ) * PI2;
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+ float radius = INV_NUM_SAMPLES;
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+ float radiusStep = radius;
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+
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+ for( int i = 0; i < NUM_SAMPLES; i ++ ) {
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+ poissonDisk[i] = vec2( cos( angle ), sin( angle ) ) * pow( radius, 0.75 );
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+ radius += radiusStep;
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+ angle += ANGLE_STEP;
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+ }
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+ }
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+
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+ float penumbraSize( const in float zReceiver, const in float zBlocker ) { // Parallel plane estimation
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+ return (zReceiver - zBlocker) / zBlocker;
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+ }
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+
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+ float findBlocker( sampler2D shadowMap, const in vec2 uv, const in float zReceiver ) {
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+ // This uses similar triangles to compute what
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+ // area of the shadow map we should search
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+ float searchRadius = LIGHT_SIZE_UV * ( zReceiver - NEAR_PLANE ) / zReceiver;
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+ float blockerDepthSum = 0.0;
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+ int numBlockers = 0;
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+
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+ for( int i = 0; i < BLOCKER_SEARCH_NUM_SAMPLES; i++ ) {
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+ float shadowMapDepth = unpackRGBAToDepth(texture2D(shadowMap, uv + poissonDisk[i] * searchRadius));
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+ if ( shadowMapDepth < zReceiver ) {
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+ blockerDepthSum += shadowMapDepth;
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+ numBlockers ++;
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+ }
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+ }
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+
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+ if( numBlockers == 0 ) return -1.0;
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+
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+ return blockerDepthSum / float( numBlockers );
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+ }
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+
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+ float PCF_Filter(sampler2D shadowMap, vec2 uv, float zReceiver, float filterRadius ) {
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+ float sum = 0.0;
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+ for( int i = 0; i < PCF_NUM_SAMPLES; i ++ ) {
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+ float depth = unpackRGBAToDepth( texture2D( shadowMap, uv + poissonDisk[ i ] * filterRadius ) );
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+ if( zReceiver <= depth ) sum += 1.0;
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+ }
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+ for( int i = 0; i < PCF_NUM_SAMPLES; i ++ ) {
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+ float depth = unpackRGBAToDepth( texture2D( shadowMap, uv + -poissonDisk[ i ].yx * filterRadius ) );
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+ if( zReceiver <= depth ) sum += 1.0;
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+ }
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+ return sum / ( 2.0 * float( PCF_NUM_SAMPLES ) );
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+ }
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+
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+ float PCSS ( sampler2D shadowMap, vec4 coords ) {
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+ vec2 uv = coords.xy;
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+ float zReceiver = coords.z; // Assumed to be eye-space z in this code
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+
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+ initPoissonSamples( uv );
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+ // STEP 1: blocker search
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+ float avgBlockerDepth = findBlocker( shadowMap, uv, zReceiver );
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+
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+ //There are no occluders so early out (this saves filtering)
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+ if( avgBlockerDepth == -1.0 ) return 1.0;
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+
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+ // STEP 2: penumbra size
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+ float penumbraRatio = penumbraSize( zReceiver, avgBlockerDepth );
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+ float filterRadius = penumbraRatio * LIGHT_SIZE_UV * NEAR_PLANE / zReceiver;
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+
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+ // STEP 3: filtering
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+ //return avgBlockerDepth;
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+ return PCF_Filter( shadowMap, uv, zReceiver, filterRadius );
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+ }
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+
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+ </script>
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+
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+ <script type="x-shader/x-fragment" id="PCSSGetShadow">
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+
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+ return PCSS( shadowMap, shadowCoord );
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+
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+ </script>
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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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+
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+ var group;
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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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+ // scene
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+
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+ scene = new THREE.Scene();
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+ scene.fog = new THREE.Fog( 0xcce0ff, 5, 100 );
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+
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+ // camera
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+
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+ camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.y = 5;
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+ camera.position.z = 15;
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+ scene.add( camera );
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+
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+ // lights
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+
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+ scene.add( new THREE.AmbientLight( 0x666666 ) );
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+
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+ var light = new THREE.DirectionalLight( 0xdfebff, 1.75 );
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+ light.position.set( 2, 8, 4 );
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+
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+ light.castShadow = true;
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+ light.shadow.mapSize.width = 1024;
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+ light.shadow.mapSize.height = 1024;
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+ light.shadow.camera.far = 20;
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+
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+ scene.add( light );
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+
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+ // scene.add( new THREE.DirectionalLightHelper( light ) );
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+ scene.add( new THREE.CameraHelper( light.shadow.camera ) );
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+
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+ // group
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+
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+ group = new THREE.Group();
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+ scene.add( group );
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+
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+ var geometry = new THREE.SphereGeometry( 0.3, 20, 20 );
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+
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+ for ( var i = 0; i < 20; i ++ ) {
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+
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+ var material = new THREE.MeshPhongMaterial( { color: Math.random() * 0xffffff } );
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+
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+ var sphere = new THREE.Mesh( geometry, material );
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+ sphere.position.x = Math.random() * 6 - 3;
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+ sphere.position.z = Math.random() * 6 - 3;
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+ sphere.castShadow = true;
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+ sphere.receiveShadow = true;
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+ sphere.userData.phase = Math.random() * Math.PI;
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+ group.add( sphere );
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+
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+ }
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+
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+ // ground
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+
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+ var groundMaterial = new THREE.MeshPhongMaterial( { color: 0x404040, specular: 0x111111 } );
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+
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+ var mesh = new THREE.Mesh( new THREE.PlaneBufferGeometry( 20000, 20000 ), groundMaterial );
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+ mesh.rotation.x = - Math.PI / 2;
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+ mesh.receiveShadow = true;
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+ scene.add( mesh );
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+
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+ // overwrite shadowmap code
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+
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+ var shader = THREE.ShaderChunk.shadowmap_pars_fragment;
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+
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+ shader = shader.replace(
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+ '#ifdef USE_SHADOWMAP',
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+ '#ifdef USE_SHADOWMAP' +
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+ document.getElementById( 'PCSS' ).textContent
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+ );
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+
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+ shader = shader.replace(
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+ '#if defined( SHADOWMAP_TYPE_PCF )',
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+ document.getElementById( 'PCSSGetShadow' ).textContent +
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+ '#if defined( SHADOWMAP_TYPE_PCF )'
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+ );
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+
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+ THREE.ShaderChunk.shadowmap_pars_fragment = shader;
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+
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+ // renderer
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.setClearColor( scene.fog.color );
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+
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+ container.appendChild( renderer.domElement );
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+
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+ renderer.gammaInput = true;
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+ renderer.gammaOutput = true;
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+
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+ renderer.shadowMap.enabled = true;
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+
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+ // controls
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+ var controls = new THREE.OrbitControls( camera, renderer.domElement );
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+ controls.maxPolarAngle = Math.PI * 0.5;
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+ controls.minDistance = 10;
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+ controls.maxDistance = 75;
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+ controls.target.set( 0, 2.5, 0 );
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+ controls.update();
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+
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+ // performance monitor
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+
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+ stats = new Stats();
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+ container.appendChild( stats.dom );
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+
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+ //
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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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+
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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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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ //
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+
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+ function animate() {
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+
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+ var time = performance.now() / 1000;
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+
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+ group.traverse( function ( child ) {
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+
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+ if ( 'phase' in child.userData ) {
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+
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+ child.position.y = Math.abs( Math.sin( time + child.userData.phase ) ) * 4 + 0.3;
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+
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+ }
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+
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+ } );
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+
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+ renderer.render( scene, camera );
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+
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+ stats.update();
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+
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+ requestAnimationFrame( animate );
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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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Mr.doob