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305 lines
6.2 KiB
HTML
305 lines
6.2 KiB
HTML
2 months 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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<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( { antialias: true, 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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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 = 2.5;
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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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