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 light</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				background-color: #000;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				color: #ffffff;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: center;
			}

			a {
				color: #ff0080;
				text-decoration: none;
			}

			a:hover {
				color: #0080ff;
			}
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info">
			<a href="http://threejs.org" target="_blank">three.js</a> - Just to show the rect light and it's edge - by <a href="http://github.com/abelnation" target="_blank">abelnation</a><br />
			Click and drag to move OrbitControls, center across the edge of the shadow.<br />
			Click to set random color CTRL-Click for White.<br />
		</div>

		<script src="../build/three.js"></script>
		<script src="js/lights/RectAreaLightUniformsLib.js"></script>
		<script src="../examples/js/libs/dat.gui.min.js"></script>
		<script src="../examples/js/controls/OrbitControls.js"></script>
		<script src="js/Detector.js"></script>

		<script>

			var container = document.getElementById( 'container' );

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var rnd = new THREE.WebGLRenderer();
			var cam = new THREE.PerspectiveCamera( 34, window.innerWidth / window.innerHeight, 0.1, 20000 );
			var orb = new THREE.OrbitControls( cam, rnd.domElement );

			var scn = new THREE.Scene();

			var matParams = {
				specular: 0xFFFFFF,
				shininess: 10000
			}

			var matFloor = new THREE.MeshPhongMaterial( matParams );
			var matBox = new THREE.MeshPhongMaterial( matParams );
			var geoFloor = new THREE.BoxGeometry( 2000, 0.1, 2000 );
			var geoBox = new THREE.BoxGeometry( Math.PI, Math.sqrt( 2 ), Math.E );
			var mshFloor = new THREE.Mesh( geoFloor, matFloor );
			var mshBox = new THREE.Mesh( geoBox, matBox );

			var amb = new THREE.AmbientLight( 0x080808 );

			// TODO (abelnation): temp point light for debugging
			var dir = new THREE.DirectionalLight( 0xFFFFFF );
			var dirHelper = new THREE.DirectionalLightHelper( dir );

			var shapes, shapeNames;
			var rectLight;
			var rectLightHelper;

			var ray = new THREE.Raycaster();
			var mouseDown = new THREE.Vector2();
			var mouse = new THREE.Vector2();

			var gui, guiElements;
			var param = {};

			function init() {

				var gl = rnd.context;

				// Check for float-RT support
				// TODO (abelnation): figure out fall-back for float textures
				if (!gl.getExtension("OES_texture_float")) {
					alert("OES_texture_float not supported");
					throw "missing webgl extension";
				}

				if (!gl.getExtension("OES_texture_float_linear")) {
					alert("OES_texture_float_linear not supported");
					throw "missing webgl extension";
				}

				rnd.shadowMap.enabled = true;
				rnd.shadowMap.type = THREE.PCFSoftShadowMap;
				rnd.gammaInput = true;
				rnd.gammaOutput = true;
				rnd.antialias = true;
				rnd.domElement.addEventListener( 'mousedown', onDocumentClick );
				rnd.domElement.addEventListener( 'mouseup', onDocumentClick );

				// cam.position.set( 0, 100, 0 );
				cam.position.set( 45, 20, 45 );

				// shapes = {
				// 	square: THREE.Polygon.makeSquare( 10.0 ),
				// 	rectangle: THREE.Polygon.makeRectangle( 10.0, 5.0 ),
				// 	circle: THREE.Polygon.makeCircle( 5.0, 20 ),
				// 	star: THREE.Polygon.makeStar( 5, 5.0, 2.5 ),
				// 	triangle: new THREE.Polygon( [
				// 		new THREE.Vector3( -5.0, -5.0, 0 ),
				// 		new THREE.Vector3(  0.0,  5.0, 0 ),
				// 		new THREE.Vector3(  5.0, -5.0, 0 ),
				// 	] )
				// };
				// shapeNames = Object.keys( shapes );

				rectLight = new THREE.RectAreaLight( 0xFFFFFF, undefined, 2, 10 );
				rectLight.matrixAutoUpdate = true;
				rectLight.intensity = 70.0;
				rectLight.position.set( 5, 5, 0 );
				// rectLight.target = mshBox;
				rectLightHelper = new THREE.RectAreaLightHelper( rectLight );
				rectLight.add( rectLightHelper );

				// TODO (abelnation): rect light shadow

				matFloor.color.set( 0x808080 );
				randomColor( matBox );

				mshFloor.receiveShadow = true;
				mshFloor.position.set( 0, 0, 0 );

				mshBox.castShadow = true;
				mshBox.receiveShadow = true;
				mshBox.position.set( 0, 5, 0 );

				scn.add( cam );

				scn.add( mshFloor );
				scn.add( mshBox );

				// scn.add( amb );

				// scn.add( dir );
				// scn.add( dirHelper );

				scn.add( rectLight );
				// scn.add( rectLightHelper );

				// scn.add( new THREE.AxisHelper( 10 ) );

				document.body.appendChild( rnd.domElement );
				onResize();
				window.addEventListener( 'resize', onResize, false );

				orb.addEventListener( 'change', render );
				orb.update();

			}

			function onResize() {

				rnd.setSize( window.innerWidth, window.innerHeight );
				cam.aspect = ( window.innerWidth / window.innerHeight );
				cam.updateProjectionMatrix();
				orb.target = mshBox.position;

			}

			function tick() {

				update();
				render();

				requestAnimationFrame( tick );

			}

			function update() {

				var dt = 6000;
				var qdt = dt / 4.0;
				var dirSigns = [
					[ 1,  1 ],
					[ - 1,  1 ],
					[ - 1,  1 ],
					[ 1,  1 ]
				];
				var t = ( Date.now() / 1000 );

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

				var r = 10.0;

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

				var ly = 5.0 + 5.0 * Math.sin( t / 3.0 );
				// var ly = 7.0;

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

				// // move box in figure 8 path
				// // xz is a figure 8
				// // y is gently rising and falling
				// 				var r = t * ( 4.0 * Math.PI );
				// var s = Math.floor( t * dirSigns.length );
                //
				// var sign = dirSigns[ s ];
				// var x = 5.0 * ( Math.cos( r ) + 1.0 ) * sign[ 0 ];
				// var z = 5.0 * Math.sin( r ) * sign[ 1 ];
				// var y = 2.5 * Math.cos( 0.5 * r ) + 5.0;
                //
				// mshBox.position.set( x, y, z );
				// mshBox.updateMatrixWorld();

			}

			function render() {

				rectLightHelper.update(); // required
				rnd.render( scn, cam );

			}

			function clearGui() {

				if ( gui ) gui.destroy();

				gui = new dat.GUI();
				gui.width = 190;
				var gStyle = gui.domElement.style;
				gStyle.position = "absolute";
				gStyle.top = "48px";
				gStyle.height = "220px";

				gui.open();

			}

			function buildGui() {

				clearGui();

				param = {
					'light color': rectLight.color.getHex(),
					intensity: rectLight.intensity,
					width: rectLight.width,
					height: rectLight.height,
					shininess: matFloor.shininess,
					// shape: shapeNames[0]
				};

				gui.add( param, 'width', 0.1, 20).onChange( function ( val ) {

					rectLight.width = val;

				} );

				gui.add( param, 'height', 0.1, 20).onChange( function ( val ) {

					rectLight.height = val;

				} );

				// gui.add( param, 'shape', shapeNames ).onChange( function ( val ) {
                //
				// 	rectLight.polygon = shapes[ val ].clone();
                //
				// } );

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

					rectLight.color.setHex( val );

				} );

				gui.add( param, 'intensity', 0, 100 ).onChange( function ( val ) {

					rectLight.intensity = val;

				} );

				gui.add( param, 'shininess', 0, 100000 ).onChange( function ( val ) {

					matBox.shininess = val;
					matFloor.shininess = val;

				} );

				// TODO (abelnation): shadow controls
				// addGui( 'distance', rectLight.distance, function( val ) {
				// rectLight.distance = val;
				// render();
				// }, false, 0, 1000 );

				// addGui( 'penumbra', rectLight.penumbra, function( val ) {
				// rectLight.penumbra = val;
				// render();
				// }, false, 0, 1 );

				// addGui( 'decay', rectLight.decay, function( val ) {
				// rectLight.decay = val;
				// render();
				// }, false, 0, 100 );

			}

			function onDocumentClick( event ) {

				event.preventDefault();

				var rndDom = rnd.domElement;

				if ( event.type === 'mousedown' ) {

					mouseDown.x = ( event.clientX / rndDom.clientWidth ) * 2 - 1;
					mouseDown.y = - ( event.clientY / rndDom.clientHeight ) * 2 + 1;

				} else {

					mouse.x = ( event.clientX / rndDom.clientWidth ) * 2 - 1;
					mouse.y = - ( event.clientY / rndDom.clientHeight ) * 2 + 1;

					if ( mouseDown.distanceTo( mouse ) < 0.0075 ) {

						ray.setFromCamera( mouse, cam );
						var found = ray.intersectObjects( [ mshBox, mshFloor ] );

						if ( found.length > 0 ) {

							if ( event.ctrlKey === false ) randomColor( found[ 0 ].object );
							else found[ 0 ].object.material.color.set( 0xffffff );

							render();

						}

					}

				}

			}

			function randomColor( target ) {

				if ( target !== undefined ) {

					if ( target.material !== undefined ) target = target.material;

					if ( target.color !== undefined ) {

						target.color.setHex( 0xffffff * Math.random() );

					}

				}

			}

			init();
			buildGui();
			tick();

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