javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - level of detail</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="http://threejs.org" target="_blank" rel="noopener">three.js</a> - level of detail
		</div>

		<script type="module">
			import {
				Clock,
				DirectionalLight,
				Fog,
				IcosahedronBufferGeometry,
				LOD,
				Mesh,
				MeshLambertMaterial,
				PerspectiveCamera,
				PointLight,
				Scene,
				WebGLRenderer,
			} from "../build/three.module.js";

			import { FlyControls } from './jsm/controls/FlyControls.js';

			var container;

			var camera, scene, renderer;

			var controls, clock = new Clock();

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 15000 );
				camera.position.z = 1000;

				controls = new FlyControls( camera );
				controls.movementSpeed = 1000;
				controls.rollSpeed = Math.PI / 10;

				scene = new Scene();
				scene.fog = new Fog( 0x000000, 1, 15000 );
				scene.autoUpdate = false;

				var light = new PointLight( 0xff2200 );
				light.position.set( 0, 0, 0 );
				scene.add( light );

				var light = new DirectionalLight( 0xffffff );
				light.position.set( 0, 0, 1 ).normalize();
				scene.add( light );

				var geometry = [

					[ new IcosahedronBufferGeometry( 100, 4 ), 50 ],
					[ new IcosahedronBufferGeometry( 100, 3 ), 300 ],
					[ new IcosahedronBufferGeometry( 100, 2 ), 1000 ],
					[ new IcosahedronBufferGeometry( 100, 1 ), 2000 ],
					[ new IcosahedronBufferGeometry( 100, 0 ), 8000 ]

				];

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

				var i, j, mesh, lod;

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

					lod = new LOD();

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

						mesh = new 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 WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				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 LOD ) {

						object.update( camera );

					}

				} );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>