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293 lines
7.1 KiB
293 lines
7.1 KiB
2 years ago
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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 - raycasting - points</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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<link type="text/css" rel="stylesheet" href="main.css">
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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="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive - raycasting - points </div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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let renderer, scene, camera, stats;
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let pointclouds;
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let raycaster;
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let intersection = null;
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let spheresIndex = 0;
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let clock;
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let toggle = 0;
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const pointer = new THREE.Vector2();
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const spheres = [];
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const threshold = 0.1;
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const pointSize = 0.05;
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const width = 80;
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const length = 160;
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const rotateY = new THREE.Matrix4().makeRotationY( 0.005 );
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init();
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animate();
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function generatePointCloudGeometry( color, width, length ) {
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const geometry = new THREE.BufferGeometry();
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const numPoints = width * length;
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const positions = new Float32Array( numPoints * 3 );
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const colors = new Float32Array( numPoints * 3 );
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let k = 0;
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for ( let i = 0; i < width; i ++ ) {
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for ( let j = 0; j < length; j ++ ) {
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const u = i / width;
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const v = j / length;
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const x = u - 0.5;
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const y = ( Math.cos( u * Math.PI * 4 ) + Math.sin( v * Math.PI * 8 ) ) / 20;
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const z = v - 0.5;
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positions[ 3 * k ] = x;
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positions[ 3 * k + 1 ] = y;
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positions[ 3 * k + 2 ] = z;
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const intensity = ( y + 0.1 ) * 5;
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colors[ 3 * k ] = color.r * intensity;
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colors[ 3 * k + 1 ] = color.g * intensity;
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colors[ 3 * k + 2 ] = color.b * intensity;
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k ++;
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}
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}
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geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
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geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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geometry.computeBoundingBox();
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return geometry;
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}
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function generatePointcloud( color, width, length ) {
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const geometry = generatePointCloudGeometry( color, width, length );
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const material = new THREE.PointsMaterial( { size: pointSize, vertexColors: true } );
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return new THREE.Points( geometry, material );
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}
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function generateIndexedPointcloud( color, width, length ) {
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const geometry = generatePointCloudGeometry( color, width, length );
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const numPoints = width * length;
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const indices = new Uint16Array( numPoints );
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let k = 0;
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for ( let i = 0; i < width; i ++ ) {
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for ( let j = 0; j < length; j ++ ) {
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indices[ k ] = k;
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k ++;
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}
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}
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geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
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const material = new THREE.PointsMaterial( { size: pointSize, vertexColors: true } );
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return new THREE.Points( geometry, material );
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}
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function generateIndexedWithOffsetPointcloud( color, width, length ) {
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const geometry = generatePointCloudGeometry( color, width, length );
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const numPoints = width * length;
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const indices = new Uint16Array( numPoints );
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let k = 0;
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for ( let i = 0; i < width; i ++ ) {
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for ( let j = 0; j < length; j ++ ) {
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indices[ k ] = k;
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k ++;
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}
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}
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geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
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geometry.addGroup( 0, indices.length );
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const material = new THREE.PointsMaterial( { size: pointSize, vertexColors: true } );
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return new THREE.Points( geometry, material );
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}
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function init() {
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const container = document.getElementById( 'container' );
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scene = new THREE.Scene();
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clock = new THREE.Clock();
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camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.set( 10, 10, 10 );
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camera.lookAt( scene.position );
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camera.updateMatrix();
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//
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const pcBuffer = generatePointcloud( new THREE.Color( 1, 0, 0 ), width, length );
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pcBuffer.scale.set( 5, 10, 10 );
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pcBuffer.position.set( - 5, 0, 0 );
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scene.add( pcBuffer );
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const pcIndexed = generateIndexedPointcloud( new THREE.Color( 0, 1, 0 ), width, length );
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pcIndexed.scale.set( 5, 10, 10 );
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pcIndexed.position.set( 0, 0, 0 );
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scene.add( pcIndexed );
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const pcIndexedOffset = generateIndexedWithOffsetPointcloud( new THREE.Color( 0, 1, 1 ), width, length );
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pcIndexedOffset.scale.set( 5, 10, 10 );
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pcIndexedOffset.position.set( 5, 0, 0 );
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scene.add( pcIndexedOffset );
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pointclouds = [ pcBuffer, pcIndexed, pcIndexedOffset ];
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//
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const sphereGeometry = new THREE.SphereGeometry( 0.1, 32, 32 );
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const sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
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for ( let i = 0; i < 40; i ++ ) {
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const sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
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scene.add( sphere );
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spheres.push( sphere );
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}
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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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container.appendChild( renderer.domElement );
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//
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raycaster = new THREE.Raycaster();
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raycaster.params.Points.threshold = threshold;
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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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window.addEventListener( 'resize', onWindowResize );
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document.addEventListener( 'pointermove', onPointerMove );
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}
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function onPointerMove( event ) {
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pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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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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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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camera.applyMatrix4( rotateY );
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camera.updateMatrixWorld();
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raycaster.setFromCamera( pointer, camera );
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const intersections = raycaster.intersectObjects( pointclouds, false );
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intersection = ( intersections.length ) > 0 ? intersections[ 0 ] : null;
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if ( toggle > 0.02 && intersection !== null ) {
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spheres[ spheresIndex ].position.copy( intersection.point );
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spheres[ spheresIndex ].scale.set( 1, 1, 1 );
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spheresIndex = ( spheresIndex + 1 ) % spheres.length;
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toggle = 0;
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}
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for ( let i = 0; i < spheres.length; i ++ ) {
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const sphere = spheres[ i ];
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sphere.scale.multiplyScalar( 0.98 );
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sphere.scale.clampScalar( 0.01, 1 );
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}
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toggle += clock.getDelta();
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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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