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