You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

158 lines
3.7 KiB

2 years ago
<!-- 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>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<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({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 material = track(new THREE.MeshBasicMaterial({
map: track(loader.load('resources/images/wall.jpg')),
}));
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>