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208 lines
5.3 KiB
208 lines
5.3 KiB
2 years ago
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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 PMREM directional light test</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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<div id="container">
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> -
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PMREM test by <a href="https://github.com/elalish" target="_blank" rel="noopener">Emmett Lalish</a>
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<br>
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<br>1: white metal. 2: white dielectric. 3: black dielectric.
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<br>PMREM on: HDR with a single bright pixel. PMREM off: DirectionalLight.
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<br>The difference between these renders indicates the error in the PMREM approximations.
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</div>
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</div>
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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/": "./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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let scene, camera, controls, renderer;
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function init() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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const aspect = width / height;
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// renderer
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( width, height );
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renderer.outputEncoding = THREE.sRGBEncoding;
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renderer.physicallyCorrectLights = true;
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// tonemapping
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renderer.toneMapping = THREE.ACESFilmicToneMapping;
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renderer.toneMappingExposure = 1;
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document.body.appendChild( renderer.domElement );
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window.addEventListener( 'resize', onWindowResize );
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// scene
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scene = new THREE.Scene();
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// camera
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camera = new THREE.PerspectiveCamera( 40, aspect, 1, 30 );
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updateCamera();
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camera.position.set( 0, 0, 16 );
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// controls
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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 = 4;
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controls.maxDistance = 20;
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// light
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const directionalLight = new THREE.DirectionalLight( 0xffffff, 0 ); // set intensity to 0 to start
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const x = 597;
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const y = 213;
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const theta = ( x + 0.5 ) * Math.PI / 512;
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const phi = ( y + 0.5 ) * Math.PI / 512;
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directionalLight.position.setFromSphericalCoords( 100, - phi, Math.PI / 2 - theta );
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scene.add( directionalLight );
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// scene.add( new THREE.DirectionalLightHelper( directionalLight ) );
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// The spot1Lux HDR environment map is expressed in nits (lux / sr). The directional light has units of lux,
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// so to match a 1 lux light, we set a single pixel with a value equal to 1 divided by the solid
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// angle of the pixel in steradians. This image is 1024 x 512,
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// so the value is 1 / ( sin( phi ) * ( pi / 512 ) ^ 2 ) = 27,490 nits.
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const gui = new GUI();
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gui.add( { enabled: true }, 'enabled' )
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.name( 'PMREM' )
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.onChange( value => {
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directionalLight.intensity = value ? 0 : 1;
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scene.traverse( function ( child ) {
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if ( child.isMesh ) {
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child.material.envMapIntensity = 1 - directionalLight.intensity;
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}
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} );
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render();
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} );
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}
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function createObjects() {
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let radianceMap = null;
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new RGBELoader()
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// .setDataType( THREE.FloatType )
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.setPath( 'textures/equirectangular/' )
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.load( 'spot1Lux.hdr', function ( texture ) {
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radianceMap = pmremGenerator.fromEquirectangular( texture ).texture;
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pmremGenerator.dispose();
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scene.background = radianceMap;
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const geometry = new THREE.SphereGeometry( 0.4, 32, 32 );
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for ( let x = 0; x <= 10; x ++ ) {
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for ( let y = 0; y <= 2; y ++ ) {
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const material = new THREE.MeshPhysicalMaterial( {
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roughness: x / 10,
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metalness: y < 1 ? 1 : 0,
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color: y < 2 ? 0xffffff : 0x000000,
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envMap: radianceMap,
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envMapIntensity: 1
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} );
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const mesh = new THREE.Mesh( geometry, material );
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mesh.position.x = x - 5;
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mesh.position.y = 1 - y;
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scene.add( mesh );
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}
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}
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render();
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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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function onWindowResize() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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camera.aspect = width / height;
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updateCamera();
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renderer.setSize( width, height );
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render();
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}
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function updateCamera() {
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const horizontalFoV = 40;
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const verticalFoV = 2 * Math.atan( Math.tan( horizontalFoV / 2 * Math.PI / 180 ) / camera.aspect ) * 180 / Math.PI;
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camera.fov = verticalFoV;
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camera.updateProjectionMatrix();
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}
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function render() {
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renderer.render( scene, camera );
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}
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Promise.resolve()
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.then( init )
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.then( createObjects )
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.then( render );
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</script>
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</body>
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</html>
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