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<title>three.js webgl - lights - physical lights</title>
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<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">
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<body>
<div id="container"></div>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Physically accurate incandescent bulb by <a href="http://clara.io" target="_blank" rel="noopener">Ben Houston</a><br />
Real world scale: Brick cube is 50 cm in size. Globe is 50 cm in diameter.<br/>
Reinhard inline tonemapping with real-world light falloff (decay = 2).
</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 Stats from 'three/addons/libs/stats.module.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
let camera, scene, renderer, bulbLight, bulbMat, hemiLight, stats;
let ballMat, cubeMat, floorMat;
let previousShadowMap = false;
// ref for lumens: http://www.power-sure.com/lumens.htm
const bulbLuminousPowers = {
'110000 lm (1000W)': 110000,
'3500 lm (300W)': 3500,
'1700 lm (100W)': 1700,
'800 lm (60W)': 800,
'400 lm (40W)': 400,
'180 lm (25W)': 180,
'20 lm (4W)': 20,
'Off': 0
};
// ref for solar irradiances: https://en.wikipedia.org/wiki/Lux
const hemiLuminousIrradiances = {
'0.0001 lx (Moonless Night)': 0.0001,
'0.002 lx (Night Airglow)': 0.002,
'0.5 lx (Full Moon)': 0.5,
'3.4 lx (City Twilight)': 3.4,
'50 lx (Living Room)': 50,
'100 lx (Very Overcast)': 100,
'350 lx (Office Room)': 350,
'400 lx (Sunrise/Sunset)': 400,
'1000 lx (Overcast)': 1000,
'18000 lx (Daylight)': 18000,
'50000 lx (Direct Sun)': 50000
};
const params = {
shadows: true,
exposure: 0.68,
bulbPower: Object.keys( bulbLuminousPowers )[ 4 ],
hemiIrradiance: Object.keys( hemiLuminousIrradiances )[ 0 ]
};
init();
animate();
function init() {
const container = document.getElementById( 'container' );
stats = new Stats();
container.appendChild( stats.dom );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
camera.position.x = - 4;
camera.position.z = 4;
camera.position.y = 2;
scene = new THREE.Scene();
const bulbGeometry = new THREE.SphereGeometry( 0.02, 16, 8 );
bulbLight = new THREE.PointLight( 0xffee88, 1, 100, 2 );
bulbMat = new THREE.MeshStandardMaterial( {
emissive: 0xffffee,
emissiveIntensity: 1,
color: 0x000000
} );
bulbLight.add( new THREE.Mesh( bulbGeometry, bulbMat ) );
bulbLight.position.set( 0, 2, 0 );
bulbLight.castShadow = true;
scene.add( bulbLight );
hemiLight = new THREE.HemisphereLight( 0xddeeff, 0x0f0e0d, 0.02 );
scene.add( hemiLight );
floorMat = new THREE.MeshStandardMaterial( {
roughness: 0.8,
color: 0xffffff,
metalness: 0.2,
bumpScale: 0.0005
} );
const textureLoader = new THREE.TextureLoader();
textureLoader.load( 'textures/hardwood2_diffuse.jpg', function ( map ) {
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 4;
map.repeat.set( 10, 24 );
map.encoding = THREE.sRGBEncoding;
floorMat.map = map;
floorMat.needsUpdate = true;
} );
textureLoader.load( 'textures/hardwood2_bump.jpg', function ( map ) {
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 4;
map.repeat.set( 10, 24 );
floorMat.bumpMap = map;
floorMat.needsUpdate = true;
} );
textureLoader.load( 'textures/hardwood2_roughness.jpg', function ( map ) {
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 4;
map.repeat.set( 10, 24 );
floorMat.roughnessMap = map;
floorMat.needsUpdate = true;
} );
cubeMat = new THREE.MeshStandardMaterial( {
roughness: 0.7,
color: 0xffffff,
bumpScale: 0.002,
metalness: 0.2
} );
textureLoader.load( 'textures/brick_diffuse.jpg', function ( map ) {
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 4;
map.repeat.set( 1, 1 );
map.encoding = THREE.sRGBEncoding;
cubeMat.map = map;
cubeMat.needsUpdate = true;
} );
textureLoader.load( 'textures/brick_bump.jpg', function ( map ) {
map.wrapS = THREE.RepeatWrapping;
map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 4;
map.repeat.set( 1, 1 );
cubeMat.bumpMap = map;
cubeMat.needsUpdate = true;
} );
ballMat = new THREE.MeshStandardMaterial( {
color: 0xffffff,
roughness: 0.5,
metalness: 1.0
} );
textureLoader.load( 'textures/planets/earth_atmos_2048.jpg', function ( map ) {
map.anisotropy = 4;
map.encoding = THREE.sRGBEncoding;
ballMat.map = map;
ballMat.needsUpdate = true;
} );
textureLoader.load( 'textures/planets/earth_specular_2048.jpg', function ( map ) {
map.anisotropy = 4;
map.encoding = THREE.sRGBEncoding;
ballMat.metalnessMap = map;
ballMat.needsUpdate = true;
} );
const floorGeometry = new THREE.PlaneGeometry( 20, 20 );
const floorMesh = new THREE.Mesh( floorGeometry, floorMat );
floorMesh.receiveShadow = true;
floorMesh.rotation.x = - Math.PI / 2.0;
scene.add( floorMesh );
const ballGeometry = new THREE.SphereGeometry( 0.25, 32, 32 );
const ballMesh = new THREE.Mesh( ballGeometry, ballMat );
ballMesh.position.set( 1, 0.25, 1 );
ballMesh.rotation.y = Math.PI;
ballMesh.castShadow = true;
scene.add( ballMesh );
const boxGeometry = new THREE.BoxGeometry( 0.5, 0.5, 0.5 );
const boxMesh = new THREE.Mesh( boxGeometry, cubeMat );
boxMesh.position.set( - 0.5, 0.25, - 1 );
boxMesh.castShadow = true;
scene.add( boxMesh );
const boxMesh2 = new THREE.Mesh( boxGeometry, cubeMat );
boxMesh2.position.set( 0, 0.25, - 5 );
boxMesh2.castShadow = true;
scene.add( boxMesh2 );
const boxMesh3 = new THREE.Mesh( boxGeometry, cubeMat );
boxMesh3.position.set( 7, 0.25, 0 );
boxMesh3.castShadow = true;
scene.add( boxMesh3 );
renderer = new THREE.WebGLRenderer();
renderer.physicallyCorrectLights = true;
renderer.outputEncoding = THREE.sRGBEncoding;
renderer.shadowMap.enabled = true;
renderer.toneMapping = THREE.ReinhardToneMapping;
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
const controls = new OrbitControls( camera, renderer.domElement );
controls.minDistance = 1;
controls.maxDistance = 20;
window.addEventListener( 'resize', onWindowResize );
const gui = new GUI();
gui.add( params, 'hemiIrradiance', Object.keys( hemiLuminousIrradiances ) );
gui.add( params, 'bulbPower', Object.keys( bulbLuminousPowers ) );
gui.add( params, 'exposure', 0, 1 );
gui.add( params, 'shadows' );
gui.open();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
renderer.toneMappingExposure = Math.pow( params.exposure, 5.0 ); // to allow for very bright scenes.
renderer.shadowMap.enabled = params.shadows;
bulbLight.castShadow = params.shadows;
if ( params.shadows !== previousShadowMap ) {
ballMat.needsUpdate = true;
cubeMat.needsUpdate = true;
floorMat.needsUpdate = true;
previousShadowMap = params.shadows;
}
bulbLight.power = bulbLuminousPowers[ params.bulbPower ];
bulbMat.emissiveIntensity = bulbLight.intensity / Math.pow( 0.02, 2.0 ); // convert from intensity to irradiance at bulb surface
hemiLight.intensity = hemiLuminousIrradiances[ params.hemiIrradiance ];
const time = Date.now() * 0.0005;
bulbLight.position.y = Math.cos( time ) * 0.75 + 1.25;
renderer.render( scene, camera );
stats.update();
}
</script>
</body>
</html>