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