javascript
/
three.js
spiegel van https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - PointLight ShadowMap </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 {
				font-family: Monospace;
				background-color: #000;
				color: #fff;
				margin: 0px;
				overflow: hidden;
			}
			#info {
				position: absolute;
				top: 10px;
				width: 100%;
				text-align: center;
				z-index: 100;
				display:block;
			}
			#info a { color: #f00; font-weight: bold; text-decoration: underline; cursor: pointer }
		</style>
	</head>
	<body>
		<div id="info">
		<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - PointLight ShadowMap by <a href="https://github.com/mkkellogg">mkkellogg</a>
		</div>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/Detector.js"></script>
		<script src="js/libs/stats.min.js"></script>
		<script>

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

			var camera, scene, renderer, stats;
			var pointLight, pointLight2;
			var torusKnot;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 10, 40 );

				scene = new THREE.Scene();
				scene.add( new THREE.AmbientLight( 0x222233 ) );

				// lights

				function createLight( color ) {

					var pointLight = new THREE.PointLight( color, 1, 30 );
					pointLight.castShadow = true;
					pointLight.shadow.camera.near = 1;
					pointLight.shadow.camera.far = 60;
					pointLight.shadow.bias = - 0.005; // reduces self-shadowing on double-sided objects

					var geometry = new THREE.SphereGeometry( 0.3, 12, 6 );
					var material = new THREE.MeshBasicMaterial( { color: color } );
					var sphere = new THREE.Mesh( geometry, material );
					pointLight.add( sphere );

					return pointLight;

				}

				pointLight = createLight( 0xffffff );
				scene.add( pointLight );

				pointLight2 = createLight( 0xff0000 );
				scene.add( pointLight2 );

				//

				var geometry = new THREE.TorusKnotGeometry( 14, 1, 150, 20 );

				var texture = new THREE.CanvasTexture( generateTexture() );
				texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
				texture.repeat.set( 32, 1 );

				var material = new THREE.MeshPhongMaterial( {
					color: 0xff0000,
					shininess: 100,
					specular: 0x222222,
					alphaMap: texture, // alphaMap uses the g channel
					alphaTest: 0.5,
					side: THREE.DoubleSide
				} );

				torusKnot = new THREE.Mesh( geometry, material );
				torusKnot.position.set( 0, 5, 0 );
				torusKnot.castShadow = true;
				torusKnot.receiveShadow = true;
				scene.add( torusKnot );

				// custom distance material
				var distanceMaterial = new THREE.MeshDistanceMaterial( {
					alphaMap: material.alphaMap,
					alphaTest: material.alphaTest
				} );
				torusKnot.customDistanceMaterial = distanceMaterial;

				//

				var geometry = new THREE.BoxGeometry( 30, 30, 30 );

				var material = new THREE.MeshPhongMaterial( {
					color: 0xa0adaf,
					shininess: 10,
					specular: 0x111111,
					side: THREE.BackSide
				} );

				var mesh = new THREE.Mesh( geometry, material );
				mesh.position.y = 10;
				mesh.receiveShadow = true;
				scene.add( mesh );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.BasicShadowMap;
				renderer.shadowMap.renderSingleSided = false; // must be set to false to honor double-sided materials
				document.body.appendChild( renderer.domElement );

				var controls = new THREE.OrbitControls( camera, renderer.domElement );
				controls.target.set( 0, 10, 0 );
				controls.update();

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

				//

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

			}

			function onWindowResize() {

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

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function generateTexture() {

				var canvas = document.createElement( 'canvas' );
				canvas.width = 256;
				canvas.height = 256;

				var context = canvas.getContext( '2d' );
				var image = context.getImageData( 0, 0, 256, 256 );

				var x = 0, y = 0, cvalue;

				for ( var i = 0, j = 0, l = image.data.length; i < l; i += 4, j ++ ) {

					x = j % 256;				// pixel col
					y = ( x == 0 ) ? y + 1 : y;	// pixel row

					// diagonal stripes
					cvalue = Math.floor( ( x + y ) / 32 ) % 2;

					image.data[ i + 0 ] = 255 * cvalue;
					image.data[ i + 1 ] = 255 * cvalue;
					image.data[ i + 2 ] = 255 * cvalue;
					image.data[ i + 3 ] = 255;

				}

				context.putImageData( image, 0, 0 );

				return canvas;

			}

			function animate() {

				requestAnimationFrame( animate );
				render();

			}

			function render() {

				var time = performance.now() * 0.001;

				pointLight.position.x = Math.sin( time ) * 9;
				pointLight.position.y = Math.sin( time * 1.1 ) * 9 + 5;
				pointLight.position.z = Math.sin( time * 1.2 ) * 9;

				time += 10000;

				pointLight2.position.x = Math.sin( time ) * 9;
				pointLight2.position.y = Math.sin( time * 1.1 ) * 9 + 5;
				pointLight2.position.z = Math.sin( time * 1.2 ) * 9;

				torusKnot.rotation.y = time * 0.1;

				renderer.render( scene, camera );

				stats.update();

			}

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