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+<!DOCTYPE html>
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+<html>
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+ <head>
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+ <title>three.js - BufferGeometry selectively drawn using attributes and a shader</title>
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+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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+ <meta content="initial-scale=1.0, maximum-scale=1.0" name="viewport">
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+ <meta name="Generator" content="https://callum.com">
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+ <style>
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+ body {
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+ background-color: #000;
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+ font-family: Monospace;
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+ margin: 0;
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+ color: #000;
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+ overflow: hidden;
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+ }
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+ a {
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+ color:#ff0;
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+ }
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+ #title {
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+ position: absolute;
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+ width: 100%;
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+ top: 0;
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+ height: 20px;
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+ padding: 0;
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+ text-align: center;
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+ font-size: 1.1em;
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+ background-color: rgba(64,96,64,0.7);
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+ color: #fff;
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+ }
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+ #ui {
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+ position:absolute;
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+ left:0;
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+ top: 20px;
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+ padding: 0;
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+ text-align: center;
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+ width:100%;
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+ height:20px;
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+ color: #fff;
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+ background-color: rgba(64,96,64,0.6);
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+ }
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+ </style>
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+ <script type="text/javascript" src="../build/three.min.js"></script>
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+ <script type="text/javascript" src="js/Detector.js"></script>
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+ <script type="text/javascript" src="js/libs/stats.min.js"></script>
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+
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+ <script type="x-shader/x-vertex" id="vertexshader">
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+ attribute float visible;
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+ varying float vVisible;
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+ attribute vec3 vertColor;
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+ varying vec3 vColor;
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+
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+ void main() {
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+ vColor = vertColor;
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+ vVisible = visible;
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+ gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1.0);
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+ }
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+ </script>
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+ <script type="x-shader/x-fragment" id="fragmentshader">
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+ varying float vVisible;
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+ varying vec3 vColor;
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+
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+ void main() {
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+ if ( vVisible > 0.0 ) {
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+ gl_FragColor = vec4( vColor, 1.0 );
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+ } else {
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+ discard;
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+ }
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+ }
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+ </script>
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+ </head>
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+ <body onload="app()">
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+ <div id="title"></div>
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+ <div id="ui"><a href="#" onclick="hideLines();">CULL SOME LINES</a> - <a href="#" onclick="showAllLines();">SHOW ALL LINES</a></div>
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+ <script>
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+ var camera, scene, renderer, stats;
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+ var geometry, mesh;
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+ var numLat = 100;
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+ var numLng = 200;
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+ var numLinesCulled = 0;
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+
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+ function app() {
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+
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+ if ( ! Detector.webgl ) {
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+
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+ Detector.addGetWebGLMessage();
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+
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+ }
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+
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+ init();
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+ animate();
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+
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+ }
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+
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+ function init() {
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+
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+ renderer = new THREE.WebGLRenderer( {
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+ antialias: true
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+ } );
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+ renderer.setClearColor( 0x000000, 0.0 );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ document.body.appendChild( renderer.domElement );
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+
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+ scene = new THREE.Scene();
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.01, 10 );
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+ camera.position.z = 3.5;
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+
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+ scene.add( new THREE.AmbientLight( 0x444444 ) );
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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 = '40px';
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+ document.body.appendChild( stats.domElement );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ addLines( 1.0 );
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+
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+ }
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+
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+ function addLines( radius ) {
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+
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+ geometry = new THREE.BufferGeometry();
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+ var linePositions = new Float32Array( numLat * numLng * 3 * 2 );
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+ var lineColors = new Float32Array( numLat * numLng * 3 * 2 );
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+ var visible = new Float32Array( numLat * numLng * 2 );
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+
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+ for ( var i = 0; i < numLat; ++ i ) {
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+
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+ for ( var j = 0; j < numLng; ++ j ) {
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+
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+ var lat = ( Math.random() * Math.PI ) / 50.0 + i / numLat * Math.PI;
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+ var lng = ( Math.random() * Math.PI ) / 50.0 + j / numLng * 2 * Math.PI;
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+
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+ var index = i * numLng + j;
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+
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+ linePositions[ index * 6 + 0 ] = 0;
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+ linePositions[ index * 6 + 1 ] = 0;
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+ linePositions[ index * 6 + 2 ] = 0;
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+ linePositions[ index * 6 + 3 ] = radius * Math.sin( lat ) * Math.cos( lng );
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+ linePositions[ index * 6 + 4 ] = radius * Math.cos( lat );
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+ linePositions[ index * 6 + 5 ] = radius * Math.sin( lat ) * Math.sin( lng );
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+
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+ var color = new THREE.Color( 0xffffff );
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+
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+ color.setHSL( lat / Math.PI, 1.0, 0.2 );
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+ lineColors[ index * 6 + 0 ] = color.r;
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+ lineColors[ index * 6 + 1 ] = color.g;
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+ lineColors[ index * 6 + 2 ] = color.b;
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+
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+ color.setHSL( lat / Math.PI, 1.0, 0.7 );
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+ lineColors[ index * 6 + 3 ] = color.r;
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+ lineColors[ index * 6 + 4 ] = color.g;
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+ lineColors[ index * 6 + 5 ] = color.b;
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+
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+ // non-0 is visible
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+ visible[ index * 2 + 0 ] = 1.0;
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+ visible[ index * 2 + 1 ] = 1.0;
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+
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+ }
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+
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+ }
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+
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+ geometry.addAttribute( 'position', new THREE.BufferAttribute( linePositions, 3 ) );
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+ geometry.addAttribute( 'vertColor', new THREE.BufferAttribute( lineColors, 3 ) );
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+ geometry.addAttribute( 'visible', new THREE.BufferAttribute( visible, 1 ) );
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+
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+ geometry.computeBoundingSphere();
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+
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+ var shaderMaterial = new THREE.ShaderMaterial( {
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+
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+ vertexShader: document.getElementById( 'vertexshader' ).textContent,
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+ fragmentShader: document.getElementById( 'fragmentshader' ).textContent
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+ } );
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+
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+ mesh = new THREE.LineSegments( geometry, shaderMaterial );
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+ scene.add( mesh );
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+
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+ updateCount();
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+
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+ }
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+
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+ function updateCount() {
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+
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+ var str = 'BufferGeometry selective drawing: 1 draw call, ' + numLat * numLng + ' lines, ' + numLinesCulled + ' culled (<a target="_blank" href="http://callum.com">author</a>)';
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+ document.getElementById( 'title' ).innerHTML = str.replace( /\B(?=(\d{3})+(?!\d))/g, "," );
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+ }
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+
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+ function hideLines() {
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+
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+ for ( var i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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+
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+ if ( Math.random() > 0.75 ) {
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+
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+ if ( geometry.attributes.visible.array[ i + 0 ] ) {
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+
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+ ++ numLinesCulled;
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+
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+ }
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+
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+ geometry.attributes.visible.array[ i + 0 ] = 0;
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+ geometry.attributes.visible.array[ i + 1 ] = 0;
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+
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+ }
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+
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+ }
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+ geometry.attributes.visible.needsUpdate = true;
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+
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+ updateCount();
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+
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+ }
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+
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+ function showAllLines() {
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+
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+ numLinesCulled = 0;
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+
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+ for ( var i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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+
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+ geometry.attributes.visible.array[ i + 0 ] = 1;
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+ geometry.attributes.visible.array[ i + 1 ] = 1;
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+
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+ }
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+
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+ geometry.attributes.visible.needsUpdate = true;
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+
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+ updateCount();
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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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+
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+ function animate( time ) {
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+
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+ requestAnimationFrame( animate );
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+
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+ var time = Date.now() * 0.001;
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+
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+ mesh.rotation.x = time * 0.25;
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+ mesh.rotation.y = time * 0.5;
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+
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+ stats.update();
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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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Mr.doob