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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js PMREM directional light test</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 id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> -
- PMREM test by <a href="https://github.com/elalish" target="_blank" rel="noopener">Emmett Lalish</a>
- <br>
- <br>1: white metal. 2: white dielectric. 3: black dielectric.
- <br>PMREM on: HDR with a single bright pixel. PMREM off: DirectionalLight.
- <br>The difference between these renders indicates the error in the PMREM approximations.
- </div>
- </div>
- <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';
- import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- let scene, camera, controls, renderer;
- function init() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- const aspect = width / height;
- // renderer
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( width, height );
- // tonemapping
- renderer.toneMapping = THREE.ACESFilmicToneMapping;
- renderer.toneMappingExposure = 1;
- document.body.appendChild( renderer.domElement );
- window.addEventListener( 'resize', onWindowResize );
- // scene
- scene = new THREE.Scene();
- // camera
- camera = new THREE.PerspectiveCamera( 40, aspect, 1, 30 );
- updateCamera();
- camera.position.set( 0, 0, 16 );
- // controls
- controls = new OrbitControls( camera, renderer.domElement );
- controls.addEventListener( 'change', render ); // use if there is no animation loop
- controls.minDistance = 4;
- controls.maxDistance = 20;
- // light
- const directionalLight = new THREE.DirectionalLight( 0xffffff, 0 ); // set intensity to 0 to start
- const x = 597;
- const y = 213;
- const theta = ( x + 0.5 ) * Math.PI / 512;
- const phi = ( y + 0.5 ) * Math.PI / 512;
- directionalLight.position.setFromSphericalCoords( 100, - phi, Math.PI / 2 - theta );
- scene.add( directionalLight );
- // scene.add( new THREE.DirectionalLightHelper( directionalLight ) );
- // The spot1Lux HDR environment map is expressed in nits (lux / sr). The directional light has units of lux,
- // so to match a 1 lux light, we set a single pixel with a value equal to 1 divided by the solid
- // angle of the pixel in steradians. This image is 1024 x 512,
- // so the value is 1 / ( sin( phi ) * ( pi / 512 ) ^ 2 ) = 27,490 nits.
- const gui = new GUI();
- gui.add( { enabled: true }, 'enabled' )
- .name( 'PMREM' )
- .onChange( value => {
- directionalLight.intensity = value ? 0 : 1;
- scene.traverse( function ( child ) {
- if ( child.isMesh ) {
- child.material.envMapIntensity = 1 - directionalLight.intensity;
- }
- } );
- render();
- } );
- }
- function createObjects() {
- let radianceMap = null;
- new RGBELoader()
- // .setDataType( THREE.FloatType )
- .setPath( 'textures/equirectangular/' )
- .load( 'spot1Lux.hdr', function ( texture ) {
- radianceMap = pmremGenerator.fromEquirectangular( texture ).texture;
- pmremGenerator.dispose();
- scene.background = radianceMap;
- const geometry = new THREE.SphereGeometry( 0.4, 32, 32 );
- for ( let x = 0; x <= 10; x ++ ) {
- for ( let y = 0; y <= 2; y ++ ) {
- const material = new THREE.MeshPhysicalMaterial( {
- roughness: x / 10,
- metalness: y < 1 ? 1 : 0,
- color: y < 2 ? 0xffffff : 0x000000,
- envMap: radianceMap,
- envMapIntensity: 1
- } );
- const mesh = new THREE.Mesh( geometry, material );
- mesh.position.x = x - 5;
- mesh.position.y = 1 - y;
- scene.add( mesh );
- }
- }
- render();
- } );
- const pmremGenerator = new THREE.PMREMGenerator( renderer );
- pmremGenerator.compileEquirectangularShader();
- }
- function onWindowResize() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- camera.aspect = width / height;
- updateCamera();
- renderer.setSize( width, height );
- render();
- }
- function updateCamera() {
- const horizontalFoV = 40;
- const verticalFoV = 2 * Math.atan( Math.tan( horizontalFoV / 2 * Math.PI / 180 ) / camera.aspect ) * 180 / Math.PI;
- camera.fov = verticalFoV;
- camera.updateProjectionMatrix();
- }
- function render() {
- renderer.render( scene, camera );
- }
- Promise.resolve()
- .then( init )
- .then( createObjects )
- .then( render );
- </script>
- </body>
- </html>
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