mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-12-25 04:23:47 +01:00
287 lines
6.3 KiB
HTML
287 lines
6.3 KiB
HTML
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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 - 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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background-color: #050505;
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margin: 0px;
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overflow: hidden;
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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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a {
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color: #0080ff;
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}
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</style>
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</head>
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<body>
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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 - buffergeometry</div>
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<script src="../build/three.min.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>
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if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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var container, stats;
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var camera, scene, renderer;
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var mesh;
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init();
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animate();
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function init() {
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container = document.getElementById( 'container' );
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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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scene = new THREE.Scene();
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scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
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//
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scene.add( new THREE.AmbientLight( 0x444444 ) );
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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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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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var triangles = 160000;
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var geometry = new THREE.BufferGeometry();
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// break geometry into
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// chunks of 21,845 triangles (3 unique vertices per triangle)
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// for indices to fit into 16 bit integer number
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// floor(2^16 / 3) = 21845
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var chunkSize = 21845;
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var indices = new Uint16Array( triangles * 3 );
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for ( var i = 0; i < indices.length; i ++ ) {
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indices[ i ] = i % ( 3 * chunkSize );
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}
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var positions = new Float32Array( triangles * 3 * 3 );
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var normals = new Float32Array( triangles * 3 * 3 );
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var colors = new Float32Array( triangles * 3 * 3 );
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var color = new THREE.Color();
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var n = 800, n2 = n/2; // triangles spread in the cube
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var d = 12, d2 = d/2; // individual triangle size
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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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var cb = new THREE.Vector3();
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var ab = new THREE.Vector3();
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for ( var i = 0; i < positions.length; i += 9 ) {
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// positions
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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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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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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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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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positions[ i ] = ax;
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positions[ i + 1 ] = ay;
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positions[ i + 2 ] = az;
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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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positions[ i + 6 ] = cx;
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positions[ i + 7 ] = cy;
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positions[ i + 8 ] = cz;
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// flat face normals
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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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cb.subVectors( pC, pB );
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ab.subVectors( pA, pB );
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cb.cross( ab );
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cb.normalize();
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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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normals[ i ] = nx;
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normals[ i + 1 ] = ny;
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normals[ i + 2 ] = nz;
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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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normals[ i + 6 ] = nx;
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normals[ i + 7 ] = ny;
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normals[ i + 8 ] = nz;
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// colors
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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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color.setRGB( vx, vy, vz );
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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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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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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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geometry.addAttribute( 'index', new THREE.BufferAttribute( indices, 1 ) );
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geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
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geometry.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
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geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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var offsets = triangles / chunkSize;
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for ( var i = 0; i < offsets; i ++ ) {
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var offset = {
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start: i * chunkSize * 3,
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index: i * chunkSize * 3,
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count: Math.min( triangles - ( i * chunkSize ), chunkSize ) * 3
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};
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geometry.offsets.push( offset );
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}
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geometry.computeBoundingSphere();
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var material = new THREE.MeshPhongMaterial( {
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color: 0xaaaaaa, specular: 0xffffff, shininess: 250,
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side: THREE.DoubleSide, vertexColors: THREE.VertexColors
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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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renderer = new THREE.WebGLRenderer( { antialias: false } );
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renderer.setClearColor( scene.fog.color );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.gammaInput = true;
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renderer.gammaOutput = true;
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container.appendChild( renderer.domElement );
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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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window.addEventListener( 'resize', onWindowResize, false );
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}
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function onWindowResize() {
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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 animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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var time = Date.now() * 0.001;
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mesh.rotation.x = time * 0.25;
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mesh.rotation.y = time * 0.5;
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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