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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - Cleanup</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- #root {
- position: absolute;
- left: 0;
- top: 0;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- class ResourceTracker {
- constructor() {
- this.resources = new Set();
- }
- track( resource ) {
- if ( resource.dispose || resource instanceof THREE.Object3D ) {
- this.resources.add( resource );
- }
- return resource;
- }
- untrack( resource ) {
- this.resources.delete( resource );
- }
- dispose() {
- for ( const resource of this.resources ) {
- if ( resource instanceof THREE.Object3D ) {
- if ( resource.parent ) {
- resource.parent.remove( resource );
- }
- }
- if ( resource.dispose ) {
- resource.dispose();
- }
- }
- this.resources.clear();
- }
- }
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 5;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.z = 2;
- const scene = new THREE.Scene();
- const cubes = []; // an array we can use to rotate the cubes
- function addStuffToScene() {
- const resTracker = new ResourceTracker();
- const track = resTracker.track.bind( resTracker );
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const geometry = track( new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth ) );
- const loader = new THREE.TextureLoader();
- const texture = loader.load( 'resources/images/wall.jpg' );
- texture.colorSpace = THREE.SRGBColorSpace;
- const material = track( new THREE.MeshBasicMaterial( {
- map: track( texture ),
- } ) );
- const cube = track( new THREE.Mesh( geometry, material ) );
- scene.add( cube );
- cubes.push( cube ); // add to our list of cubes to rotate
- return resTracker;
- }
- function waitSeconds( seconds = 0 ) {
- return new Promise( resolve => setTimeout( resolve, seconds * 1000 ) );
- }
- async function process() {
- for ( ;; ) {
- const resTracker = addStuffToScene();
- await waitSeconds( 2 );
- cubes.length = 0; // remove the cubes
- resTracker.dispose();
- await waitSeconds( 1 );
- }
- }
- process();
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- const needResize = canvas.width !== width || canvas.height !== height;
- if ( needResize ) {
- renderer.setSize( width, height, false );
- }
- return needResize;
- }
- function render( time ) {
- time *= 0.001;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- cubes.forEach( ( cube, ndx ) => {
- const speed = .2 + ndx * .1;
- const rot = time * speed;
- cube.rotation.x = rot;
- cube.rotation.y = rot;
- } );
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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