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237 lines
6.6 KiB
237 lines
6.6 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 Loaded Files</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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"three/addons/": "../../examples/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 {GLTFLoader} from 'three/addons/loaders/GLTFLoader.js';
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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) {
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return resource;
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}
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// handle children and when material is an array of materials or
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// uniform is array of textures
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if (Array.isArray(resource)) {
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resource.forEach(resource => this.track(resource));
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return resource;
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}
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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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if (resource instanceof THREE.Object3D) {
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this.track(resource.geometry);
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this.track(resource.material);
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this.track(resource.children);
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} else if (resource instanceof THREE.Material) {
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// We have to check if there are any textures on the material
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for (const value of Object.values(resource)) {
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if (value instanceof THREE.Texture) {
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this.track(value);
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}
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}
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// We also have to check if any uniforms reference textures or arrays of textures
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if (resource.uniforms) {
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for (const value of Object.values(resource.uniforms)) {
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if (value) {
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const uniformValue = value.value;
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if (uniformValue instanceof THREE.Texture ||
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Array.isArray(uniformValue)) {
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this.track(uniformValue);
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}
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}
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}
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}
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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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renderer.outputEncoding = THREE.sRGBEncoding;
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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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scene.background = new THREE.Color('lightblue');
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function addLight(...pos) {
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const color = 0xFFFFFF;
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const intensity = 0.8;
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const light = new THREE.DirectionalLight(color, intensity);
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light.position.set(...pos);
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scene.add(light);
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}
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addLight(-1, 2, 4);
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addLight( 2, -2, 3);
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function frameArea(sizeToFitOnScreen, boxSize, boxCenter, camera) {
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const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
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const halfFovY = THREE.MathUtils.degToRad(camera.fov * .5);
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const distance = halfSizeToFitOnScreen / Math.tan(halfFovY);
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// compute a unit vector that points in the direction the camera is now
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// in the xz plane from the center of the box
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const direction = (new THREE.Vector3())
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.subVectors(camera.position, boxCenter)
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.multiply(new THREE.Vector3(1, 0, 1))
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.normalize();
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// move the camera to a position distance units way from the center
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// in whatever direction the camera was from the center already
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camera.position.copy(direction.multiplyScalar(distance).add(boxCenter));
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// pick some near and far values for the frustum that
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// will contain the box.
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camera.near = boxSize / 100;
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camera.far = boxSize * 100;
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camera.updateProjectionMatrix();
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// point the camera to look at the center of the box
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camera.lookAt(boxCenter.x, boxCenter.y, boxCenter.z);
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}
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const gltfLoader = new GLTFLoader();
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function loadGLTF(url) {
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return new Promise((resolve, reject) => {
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gltfLoader.load(url, resolve, undefined, reject);
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});
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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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const fileURLs = [
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'resources/models/cartoon_lowpoly_small_city_free_pack/scene.gltf', /* threejs.org: url */
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'resources/models/3dbustchallange_submission/scene.gltf', /* threejs.org: url */
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'resources/models/mountain_landscape/scene.gltf', /* threejs.org: url */
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'resources/models/simple_house_scene/scene.gltf', /* threejs.org: url */
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];
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async function loadFiles() {
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for (;;) {
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for (const url of fileURLs) {
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const resMgr = new ResourceTracker();
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const track = resMgr.track.bind(resMgr);
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const gltf = await loadGLTF(url);
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const root = track(gltf.scene);
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scene.add(root);
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// compute the box that contains all the stuff
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// from root and below
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const box = new THREE.Box3().setFromObject(root);
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const boxSize = box.getSize(new THREE.Vector3()).length();
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const boxCenter = box.getCenter(new THREE.Vector3());
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// set the camera to frame the box
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frameArea(boxSize * 1.1, boxSize, boxCenter, camera);
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await waitSeconds(2);
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renderer.render(scene, camera);
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resMgr.dispose();
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await waitSeconds(1);
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}
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}
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}
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loadFiles();
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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() {
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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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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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