LOD，听起来很牛逼的样子

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	<head>

		<title>three.js webgl - level-of-details</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:#000;

				color:#fff;

				padding:0;

				margin:0;

				font-weight: bold;

				overflow:hidden;

			}

			#info {

				position: absolute;

				top: 0px; width: 100%;

				color: #ffffff;

				padding: 5px;

				font-family: Monospace;

				font-size: 13px;

				text-align: center;

				z-index:100;

			}

			a { color:red }

		</style>

	</head>

	<body>

		<div id="info">

			<a href="http://threejs.org" target="_blank">three.js</a> - level-of-details WebGL example

		</div>

		<script src="../build/three.js"></script>

		<script src="js/controls/FlyControls.js"></script>

		<script src="js/Detector.js"></script>

		<script src="js/libs/stats.min.js"></script>

		<script>

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

			var container, stats;

			var camera, scene, renderer;

			var geometry, objects;

			var controls, clock = new THREE.Clock();

			init();

			animate();

			function init() {

				container = document.createElement( 'div' );

				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 15000 );

				camera.position.z = 1000;

				controls = new THREE.FlyControls( camera );

				controls.movementSpeed = 1000;

				controls.rollSpeed = Math.PI / 10;

				scene = new THREE.Scene();

				scene.fog = new THREE.Fog( 0x000000, 1, 15000 );

				scene.autoUpdate = false;

				var light = new THREE.PointLight( 0xff2200 );

				light.position.set( 0, 0, 0 );

				scene.add( light );

				var light = new THREE.DirectionalLight( 0xffffff );

				light.position.set( 0, 0, 1 ).normalize();

				scene.add( light );

				var geometry = [

					[ new THREE.IcosahedronGeometry( 100, 4 ), 50 ],

					[ new THREE.IcosahedronGeometry( 100, 3 ), 300 ],

					[ new THREE.IcosahedronGeometry( 100, 2 ), 1000 ],

					[ new THREE.IcosahedronGeometry( 100, 1 ), 2000 ],

					[ new THREE.IcosahedronGeometry( 100, 0 ), 8000 ]

				];

				var material = new THREE.MeshLambertMaterial( { color: 0xffffff, wireframe: true } );

				var i, j, mesh, lod;

				for ( j = 0; j < 1000; j ++ ) {

					lod = new THREE.LOD();

					for ( i = 0; i < geometry.length; i ++ ) {

						mesh = new THREE.Mesh( geometry[ i ][ 0 ], material );

						mesh.scale.set( 1.5, 1.5, 1.5 );

						mesh.updateMatrix();

						mesh.matrixAutoUpdate = false;

						lod.addLevel( mesh, geometry[ i ][ 1 ] );

					}

					lod.position.x = 10000 * ( 0.5 - Math.random() );

					lod.position.y =  7500 * ( 0.5 - Math.random() );

					lod.position.z = 10000 * ( 0.5 - Math.random() );

					lod.updateMatrix();

					lod.matrixAutoUpdate = false;

					scene.add( lod );

				}

				renderer = new THREE.WebGLRenderer();

				renderer.setPixelRatio( window.devicePixelRatio );

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

				renderer.sortObjects = false;

				container.appendChild( renderer.domElement );

				//

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

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;

				camera.updateProjectionMatrix();

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

			}

			function animate() {

				requestAnimationFrame( animate );

				render();

			}

			function render() {

				controls.update( clock.getDelta() );

				scene.updateMatrixWorld();

				scene.traverse( function ( object ) {

					if ( object instanceof THREE.LOD ) {

						object.update( camera );

					}

				} );

				renderer.render( scene, camera );

			}

		</script>

	</body>

</html>
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LOD，听起来很牛逼的样子

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