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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js WebGPU - materials - cubemap mipmaps</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - cubemap customized mipmaps demo.<br/>
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+ Left: WebGPU generated mipmaps<br/>
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+ Right: manual mipmaps<br/>
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+ </div>
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+
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+ <script type="importmap">
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+ {
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+ "imports": {
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+ "three": "../build/three.webgpu.js",
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+ "three/webgpu": "../build/three.webgpu.js",
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+ "three/tsl": "../build/three.tsl.js",
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+ "three/addons/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+
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+ import * as THREE from 'three/webgpu';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+
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+ let container;
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+
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+ let camera, scene, renderer;
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+
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+ init();
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+
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+ // load customized cube texture
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+ async function loadCubeTextureWithMipmaps() {
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+
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+ const path = 'textures/cube/angus/';
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+ const format = '.jpg';
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+ const mipmaps = [];
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+ const maxLevel = 8;
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+
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+ async function loadCubeTexture( urls ) {
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+
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+ return new Promise( function ( resolve ) {
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+
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+ new THREE.CubeTextureLoader().load( urls, function ( cubeTexture ) {
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+
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+ resolve( cubeTexture );
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+
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+ } );
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+
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+
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+ } );
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+
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+ }
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+
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+ // load mipmaps
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+ const pendings = [];
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+
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+ for ( let level = 0; level <= maxLevel; ++ level ) {
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+
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+ const urls = [];
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+
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+ for ( let face = 0; face < 6; ++ face ) {
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+
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+ urls.push( path + 'cube_m0' + level + '_c0' + face + format );
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+
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+ }
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+
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+ const mipmapLevel = level;
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+
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+ pendings.push( loadCubeTexture( urls ).then( function ( cubeTexture ) {
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+
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+ mipmaps[ mipmapLevel ] = cubeTexture;
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+
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+ } ) );
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+
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+ }
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+
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+ await Promise.all( pendings );
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+
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+ const customizedCubeTexture = mipmaps.shift();
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+ customizedCubeTexture.mipmaps = mipmaps;
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+ customizedCubeTexture.colorSpace = THREE.SRGBColorSpace;
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+ customizedCubeTexture.minFilter = THREE.LinearMipMapLinearFilter;
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+ customizedCubeTexture.magFilter = THREE.LinearFilter;
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+ customizedCubeTexture.generateMipmaps = false;
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+ customizedCubeTexture.needsUpdate = true;
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+
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+ return customizedCubeTexture;
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+
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+ }
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+
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+ function init() {
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.z = 500;
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+
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+ scene = new THREE.Scene();
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+
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+ loadCubeTextureWithMipmaps().then( function ( cubeTexture ) {
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+
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+ // model
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+ const sphere = new THREE.SphereGeometry( 100, 128, 128 );
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+
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+ // manual mipmaps
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+ let material = new THREE.MeshBasicMaterial( { color: 0xffffff, envMap: cubeTexture } );
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+ material.name = 'manual mipmaps';
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+
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+ let mesh = new THREE.Mesh( sphere, material );
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+ mesh.position.set( 100, 0, 0 );
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+ scene.add( mesh );
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+
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+
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+ // auto mipmaps
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+ material = material.clone();
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+ material.name = 'auto mipmaps';
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+
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+ const autoCubeTexture = cubeTexture.clone();
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+ autoCubeTexture.mipmaps = [];
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+ autoCubeTexture.generateMipmaps = true;
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+ autoCubeTexture.needsUpdate = true;
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+
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+ material.envMap = autoCubeTexture;
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+
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+ mesh = new THREE.Mesh( sphere, material );
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+ mesh.position.set( - 100, 0, 0 );
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+ scene.add( mesh );
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+
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+ } );
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+
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+ //renderer
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+ renderer = new THREE.WebGPURenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.setAnimationLoop( animate );
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+ container.appendChild( renderer.domElement );
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+
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+ //controls
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+ const controls = new OrbitControls( camera, renderer.domElement );
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+ controls.minPolarAngle = Math.PI / 4;
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+ controls.maxPolarAngle = Math.PI / 1.5;
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Michael Herzog
