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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 - interactive - buffergeometry</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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+ color: #cccccc;
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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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+
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+ background-color: #050505;
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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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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+
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+ a {
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+
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+ color: #0080ff;
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+ }
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+
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+ </style>
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - interactive - buffergeometry</div>
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+
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+ <script src="../build/three.min.js"></script>
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+
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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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+
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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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+
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+ var camera, scene, renderer;
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+
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+ var projector, raycaster, mouse, points = [];
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+
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+ var mesh, line;
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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.getElementById( 'container' );
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+
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+ //
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+
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+ camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
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+ camera.position.z = 2750;
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+
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+ scene = new THREE.Scene();
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+ scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
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+
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+ //
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+
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+ scene.add( new THREE.AmbientLight( 0x444444 ) );
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+
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+ var light1 = new THREE.DirectionalLight( 0xffffff, 0.5 );
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+ light1.position.set( 1, 1, 1 );
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+ scene.add( light1 );
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+
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+ var light2 = new THREE.DirectionalLight( 0xffffff, 1.5 );
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+ light2.position.set( 0, -1, 0 );
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+ scene.add( light2 );
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+
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+ //
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+
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+ var triangles = 5000;
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+
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+ var geometry = new THREE.BufferGeometry();
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+
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+ geometry.addAttribute( 'position', Float32Array, triangles * 3, 3 );
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+ geometry.addAttribute( 'normal', Float32Array, triangles * 3, 3 );
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+ geometry.addAttribute( 'color', Float32Array, triangles * 3, 3 );
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+
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+ var positions = geometry.attributes.position.array;
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+ var normals = geometry.attributes.normal.array;
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+ var colors = geometry.attributes.color.array;
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+
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+ var color = new THREE.Color();
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+
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+ var n = 800, n2 = n/2; // triangles spread in the cube
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+ var d = 120, d2 = d/2; // individual triangle size
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+
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+ var pA = new THREE.Vector3();
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+ var pB = new THREE.Vector3();
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+ var pC = new THREE.Vector3();
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+
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+ var cb = new THREE.Vector3();
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+ var ab = new THREE.Vector3();
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+
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+ for ( var i = 0; i < positions.length; i += 9 ) {
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+
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+ // positions
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+
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+ var x = Math.random() * n - n2;
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+ var y = Math.random() * n - n2;
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+ var z = Math.random() * n - n2;
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+
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+ var ax = x + Math.random() * d - d2;
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+ var ay = y + Math.random() * d - d2;
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+ var az = z + Math.random() * d - d2;
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+
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+ var bx = x + Math.random() * d - d2;
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+ var by = y + Math.random() * d - d2;
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+ var bz = z + Math.random() * d - d2;
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+
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+ var cx = x + Math.random() * d - d2;
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+ var cy = y + Math.random() * d - d2;
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+ var cz = z + Math.random() * d - d2;
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+
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+ positions[ i ] = ax;
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+ positions[ i + 1 ] = ay;
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+ positions[ i + 2 ] = az;
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+
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+ positions[ i + 3 ] = bx;
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+ positions[ i + 4 ] = by;
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+ positions[ i + 5 ] = bz;
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+
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+ positions[ i + 6 ] = cx;
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+ positions[ i + 7 ] = cy;
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+ positions[ i + 8 ] = cz;
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+
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+ // flat face normals
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+
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+ pA.set( ax, ay, az );
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+ pB.set( bx, by, bz );
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+ pC.set( cx, cy, cz );
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+
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+ cb.subVectors( pC, pB );
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+ ab.subVectors( pA, pB );
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+ cb.cross( ab );
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+
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+ cb.normalize();
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+
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+ var nx = cb.x;
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+ var ny = cb.y;
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+ var nz = cb.z;
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+
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+ normals[ i ] = nx;
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+ normals[ i + 1 ] = ny;
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+ normals[ i + 2 ] = nz;
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+
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+ normals[ i + 3 ] = nx;
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+ normals[ i + 4 ] = ny;
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+ normals[ i + 5 ] = nz;
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+
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+ normals[ i + 6 ] = nx;
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+ normals[ i + 7 ] = ny;
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+ normals[ i + 8 ] = nz;
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+
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+ // colors
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+
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+ var vx = ( x / n ) + 0.5;
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+ var vy = ( y / n ) + 0.5;
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+ var vz = ( z / n ) + 0.5;
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+
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+ color.setRGB( vx, vy, vz );
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+
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+ colors[ i ] = color.r;
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+ colors[ i + 1 ] = color.g;
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+ colors[ i + 2 ] = color.b;
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+
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+ colors[ i + 3 ] = color.r;
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+ colors[ i + 4 ] = color.g;
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+ colors[ i + 5 ] = color.b;
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+
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+ colors[ i + 6 ] = color.r;
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+ colors[ i + 7 ] = color.g;
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+ colors[ i + 8 ] = color.b;
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+
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+ }
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+
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+ geometry.computeBoundingSphere();
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+
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+ var material = new THREE.MeshPhongMaterial( {
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+ color: 0xaaaaaa, ambient: 0xaaaaaa, specular: 0xffffff, shininess: 250,
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+ side: THREE.DoubleSide, vertexColors: THREE.VertexColors
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+ } );
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ //
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+
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+ projector = new THREE.Projector();
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+ raycaster = new THREE.Raycaster();
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+
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+ mouse = new THREE.Vector2();
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+
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+ var geometry = new THREE.BufferGeometry();
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+ geometry.addAttribute( 'position', Float32Array, 4, 3 );
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+
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+ var material = new THREE.LineBasicMaterial( { color: 0xffffff, linewidth: 2, transparent: true } );
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+
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+ line = new THREE.Line( geometry, material );
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+ scene.add( line );
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+
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+ //
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: false } );
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+ renderer.setClearColor( scene.fog.color, 1 );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ container.appendChild( renderer.domElement );
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+
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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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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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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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+ function onDocumentMouseMove( event ) {
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+
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+ event.preventDefault();
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+
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+ mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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+ mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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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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+ 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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+
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+ function render() {
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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 * 0.15;
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+ mesh.rotation.y = time * 0.25;
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+
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+ var vector = new THREE.Vector3( mouse.x, mouse.y, 1 );
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+ projector.unprojectVector( vector, camera );
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+
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+ raycaster.set( camera.position, vector.sub( camera.position ).normalize() );
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+
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+ var intersects = raycaster.intersectObject( mesh );
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+
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+ if ( intersects.length > 0 ) {
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+
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+ var intersect = intersects[ 0 ];
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+
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+ var object = intersect.object;
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+ var positions = object.geometry.attributes.position.array;
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+
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+ for ( var i = 0, j = 0; i < 4; i ++, j += 3 ) {
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+
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+ var index = intersect.indices[ i % 3 ] * 3;
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+
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+ line.geometry.attributes.position.array[ j ] = positions[ index ];
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+ line.geometry.attributes.position.array[ j + 1 ] = positions[ index + 1 ];
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+ line.geometry.attributes.position.array[ j + 2 ] = positions[ index + 2 ];
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+
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+ }
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+
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+ mesh.updateMatrix();
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+
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+ line.geometry.applyMatrix( mesh.matrix );
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+
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+ line.visible = true;
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+
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+ } else {
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+
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+ line.visible = false;
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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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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Mr.doob