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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 webgl - glTF loader</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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+
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+ <body>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - GLTFLoader + <a href="https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_variants" target="_blank" rel="noopener">KHR_materials_variants</a> extension<br />
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+ <a href="https://github.com/pushmatrix/glTF-Sample-Models/tree/master/2.0/MaterialsVariantsShoe" target="_blank" rel="noopener">Materials Variants Shoe</a> by
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+ <a href="https://github.com/Shopify" target="_blank" rel="noopener">Shopify, Inc</a><br />
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+ <a href="https://hdrihaven.com/hdri/?h=royal_esplanade" target="_blank" rel="noopener">Royal Esplanade</a> by <a href="https://hdrihaven.com/" target="_blank" rel="noopener">HDRI Haven</a>
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+
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+ import { GUI } from './jsm/libs/dat.gui.module.js';
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+ import { OrbitControls } from './jsm/controls/OrbitControls.js';
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+ import { GLTFLoader } from './jsm/loaders/GLTFLoader.js';
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+ import { RGBELoader } from './jsm/loaders/RGBELoader.js';
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+ import { RoughnessMipmapper } from './jsm/utils/RoughnessMipmapper.js';
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+
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+ let camera, scene, renderer;
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+ let gui;
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+
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+ const state = {
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+ variant: "midnight"
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+ };
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+
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+ init();
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+ render();
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+
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+ function init() {
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+
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+ const container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.25, 20 );
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+ camera.position.set( 3.0, 3.0, - 3.0);
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+
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+ scene = new THREE.Scene();
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+
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+ new RGBELoader()
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+ .setDataType( THREE.UnsignedByteType )
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+ .setPath( 'textures/equirectangular/' )
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+ .load( 'royal_esplanade_1k.hdr', function ( texture ) {
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+
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+ const envMap = pmremGenerator.fromEquirectangular( texture ).texture;
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+
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+ scene.background = envMap;
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+ scene.environment = envMap;
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+
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+ texture.dispose();
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+ pmremGenerator.dispose();
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+
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+ render();
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+
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+ // model
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+
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+ // use of RoughnessMipmapper is optional
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+ const roughnessMipmapper = new RoughnessMipmapper( renderer );
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+
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+ const loader = new GLTFLoader().setPath( 'models/gltf/MaterialsVariantsShoe/glTF/' );
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+ loader.load( 'MaterialsVariantsShoe.gltf', function ( gltf ) {
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+
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+ gltf.scene.scale.set( 10.0, 10.0, 10.0 );
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+
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+ gltf.scene.traverse( function ( child ) {
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+
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+ if ( child.isMesh ) {
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+
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+ // TOFIX RoughnessMipmapper seems to be broken with WebGL 2.0
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+ // roughnessMipmapper.generateMipmaps( child.material );
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+
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+ }
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+
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+ } );
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+
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+ scene.add( gltf.scene );
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+
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+ // GUI
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+ gui = new GUI();
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+
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+ // Details of the KHR_materials_variants extension used here can be found below
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+ // https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_variants
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+
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+ if ( gltf.userData.gltfExtensions !== undefined ) {
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+
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+ let parser = gltf.parser;
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+
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+ const extension = gltf.userData.gltfExtensions[ 'KHR_materials_variants' ];
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+
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+ if ( extension !== undefined ) {
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+
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+ let variants = extension.variants.map( variant => variant.name );
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+ let guiVariants = gui.add( state, 'variant', variants ).name( 'Variant' );
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+
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+ changeMaterialByVariantName(scene, parser, extension, state.variant);
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+
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+ guiVariants.onChange( function ( value ) {
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+
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+ changeMaterialByVariantName(scene, parser, extension, value);
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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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+ roughnessMipmapper.dispose();
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+
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+ render();
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+
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+ } );
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+
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+ } );
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+
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+ renderer = new THREE.WebGLRenderer( { 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.toneMapping = THREE.ACESFilmicToneMapping;
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+ renderer.toneMappingExposure = 1;
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+ renderer.outputEncoding = THREE.sRGBEncoding;
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+ container.appendChild( renderer.domElement );
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+
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+ const pmremGenerator = new THREE.PMREMGenerator( renderer );
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+ pmremGenerator.compileEquirectangularShader();
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+
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+ const controls = new OrbitControls( camera, renderer.domElement );
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+ controls.addEventListener( 'change', render ); // use if there is no animation loop
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+ controls.minDistance = 2;
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+ controls.maxDistance = 10;
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+ controls.target.set( 0, 0, - 0.2 );
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+ controls.update();
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ }
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+
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+ function changeMaterialByVariantName( scene, parser, extension, variantName ) {
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+
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+ const variantIndex = extension.variants.findIndex( ( v ) => v.name.includes( variantName ) );
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+
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+ scene.traverse( async ( object ) => {
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+
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+ if ( !object.isMesh ) return;
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+
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+ const meshVariantData = object.userData.gltfExtensions[ 'KHR_materials_variants' ];
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+
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+ if ( meshVariantData !== undefined ) {
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+
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+ let materialIndex = - 1;
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+
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+ for ( let i = 0; i < meshVariantData.mappings.length; i ++ ) {
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+
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+ const mapping = meshVariantData.mappings[ i ];
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+
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+ if ( mapping.variants.indexOf( variantIndex ) != - 1 ) {
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+
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+ materialIndex = mapping.material;
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+
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+ break;
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+
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+ }
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+
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+ }
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+
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+ if ( materialIndex != - 1 ) {
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+
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+ object.material = await parser.getDependency( 'material', materialIndex );
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+
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+ render();
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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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+
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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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+ render();
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+
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+ }
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+
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+ //
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+
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+ function render() {
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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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cx20
