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webgl_lod.html
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<!doctype html>
<html lang="en">
<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://github.com/mrdoob/three.js" target="_blank">three.js</a> - level-of-details WebGL example
</div>
<script src="../build/Three.js"></script>
<script src="js/Detector.js"></script>
<script src="js/Stats.js"></script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var container, stats;
var camera, scene, renderer;
var geometry, objects;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
scene = new THREE.Scene();
scene.fog = new THREE.Fog( 0x000000, 1, 15000 );
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 15000 );
camera.position.z = 1000;
scene.add( camera );
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 material = new THREE.MeshLambertMaterial( { color: 0xffffff, wireframe: true } );
var geometry = [
[ new THREE.SphereGeometry( 100, 64, 32 ), 300 ],
[ new THREE.SphereGeometry( 100, 32, 16 ), 1000 ],
[ new THREE.SphereGeometry( 100, 16, 8 ), 2000 ],
[ new THREE.SphereGeometry( 100, 8, 4 ), 10000 ]
];
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( { clearColor: 0x000000, clearAlpha: 1 } );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.sortObjects = false;
renderer.autoUpdateScene = false;
container.appendChild( renderer.domElement );
}
function onDocumentMouseMove(event) {
mouseX = ( event.clientX - windowHalfX ) * 10;
mouseY = ( event.clientY - windowHalfY ) * 10;
}
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * .005;
camera.position.y += ( - mouseY - camera.position.y ) * .01;
camera.lookAt( scene.position );
scene.updateMatrixWorld();
THREE.SceneUtils.traverseHierarchy( scene, function ( node ) { if ( node instanceof THREE.LOD ) node.update( camera ) } );
renderer.render( scene, camera );
}
</script>
</body>
</html>