javascript
/
three.js
镜像来自 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - lights - rect area light</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="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - THREE.RectAreaLight<br/>
			by <a href="http://github.com/abelnation" target="_blank" rel="noopener">abelnation</a>
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';

			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { RectAreaLightHelper } from './jsm/helpers/RectAreaLightHelper.js';
			import { RectAreaLightUniformsLib } from './jsm/lights/RectAreaLightUniformsLib.js';

			let renderer, scene, camera;

			const origin = new THREE.Vector3();

			let rectLight, rectLightHelper;

			let param = {};
			let stats;

			init();
			animate();

			function init() {

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFSoftShadowMap;
				renderer.outputEncoding = THREE.sRGBEncoding;
				document.body.appendChild( renderer.domElement );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 20, 35 );

				scene = new THREE.Scene();

				const ambient = new THREE.AmbientLight( 0xffffff, 0.1 );
				scene.add( ambient );

				RectAreaLightUniformsLib.init();

				rectLight = new THREE.RectAreaLight( 0xffffff, 1, 10, 10 );
				rectLight.position.set( 5, 5, 0 );
				scene.add( rectLight );

				rectLightHelper = new RectAreaLightHelper( rectLight );
				rectLight.add( rectLightHelper );

				const geoFloor = new THREE.BoxBufferGeometry( 2000, 0.1, 2000 );
				const matStdFloor = new THREE.MeshStandardMaterial( { color: 0x808080, roughness: 0, metalness: 0 } );
				const mshStdFloor = new THREE.Mesh( geoFloor, matStdFloor );
				scene.add( mshStdFloor );

				const matStdObjects = new THREE.MeshStandardMaterial( { color: 0xA00000, roughness: 0, metalness: 0 } );

				const geoBox = new THREE.BoxBufferGeometry( Math.PI, Math.sqrt( 2 ), Math.E );
				const mshStdBox = new THREE.Mesh( geoBox, matStdObjects );
				mshStdBox.position.set( 0, 5, 0 );
				mshStdBox.rotation.set( 0, Math.PI / 2.0, 0 );
				mshStdBox.castShadow = true;
				mshStdBox.receiveShadow = true;
				scene.add( mshStdBox );

				const geoSphere = new THREE.SphereBufferGeometry( 1.5, 32, 32 );
				const mshStdSphere = new THREE.Mesh( geoSphere, matStdObjects );
				mshStdSphere.position.set( - 5, 5, 0 );
				mshStdSphere.castShadow = true;
				mshStdSphere.receiveShadow = true;
				scene.add( mshStdSphere );

				const geoKnot = new THREE.TorusKnotBufferGeometry( 1.5, 0.5, 100, 16 );
				const mshStdKnot = new THREE.Mesh( geoKnot, matStdObjects );
				mshStdKnot.position.set( 5, 5, 0 );
				mshStdKnot.castShadow = true;
				mshStdKnot.receiveShadow = true;
				scene.add( mshStdKnot );

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.target.copy( mshStdBox.position );
				controls.update();

				// GUI

				const gui = new GUI( { width: 300 } );
				gui.open();

				param = {
					motion: true,
					width: rectLight.width,
					height: rectLight.height,
					color: rectLight.color.getHex(),
					intensity: rectLight.intensity,
					'ambient': ambient.intensity,
					'floor color': matStdFloor.color.getHex(),
					'object color': matStdObjects.color.getHex(),
					'roughness': matStdFloor.roughness,
					'metalness': matStdFloor.metalness
				};

				gui.add( param, 'motion' );

				const lightFolder = gui.addFolder( 'Light' );

				lightFolder.add( param, 'width', 1, 20 ).step( 0.1 ).onChange( function ( val ) {

					rectLight.width = val;

				} );

				lightFolder.add( param, 'height', 1, 20 ).step( 0.1 ).onChange( function ( val ) {

					rectLight.height = val;

				} );

				lightFolder.addColor( param, 'color' ).onChange( function ( val ) {

					rectLight.color.setHex( val );

				} );

				lightFolder.add( param, 'intensity', 0.0, 4.0 ).step( 0.01 ).onChange( function ( val ) {

					rectLight.intensity = val;

				} );

				lightFolder.add( param, 'ambient', 0.0, 0.2 ).step( 0.01 ).onChange( function ( val ) {

					ambient.intensity = val;

				} );

				lightFolder.open();

				const standardFolder = gui.addFolder( 'Standard Material' );

				standardFolder.addColor( param, 'floor color' ).onChange( function ( val ) {

					matStdFloor.color.setHex( val );

				} );

				standardFolder.addColor( param, 'object color' ).onChange( function ( val ) {

					matStdObjects.color.setHex( val );

				} );

				standardFolder.add( param, 'roughness', 0.0, 1.0 ).step( 0.01 ).onChange( function ( val ) {

					matStdObjects.roughness = val;
					matStdFloor.roughness = val;

				} );

				// TODO (abelnation): use env map to reflect metal property
				standardFolder.add( param, 'metalness', 0.0, 1.0 ).step( 0.01 ).onChange( function ( val ) {

					matStdObjects.metalness = val;
					matStdFloor.metalness = val;

				} );

				standardFolder.open();

				// TODO: rect area light distance
				// TODO: rect area light decay

				//

				window.addEventListener( 'resize', onResize, false );

				stats = new Stats();
				document.body.appendChild( stats.dom );

			}

			function onResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );
				camera.aspect = ( window.innerWidth / window.innerHeight );
				camera.updateProjectionMatrix();

			}

			function animate() {

				requestAnimationFrame( animate );

				if ( param.motion ) {

					const t = ( Date.now() / 2000 );

					// move light in circle around center
					// change light height with sine curve

					const r = 15.0;

					const lx = r * Math.cos( t );
					const lz = r * Math.sin( t );

					const ly = 5.0 + 5.0 * Math.sin( t / 3.0 );

					rectLight.position.set( lx, ly, lz );
					rectLight.lookAt( origin );

				}

				rectLightHelper.update();

				renderer.render( scene, camera );

				stats.update();

			}

		</script>
	</body>
</html>