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143 lines
3.4 KiB
143 lines
3.4 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - level of detail</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - level of detail
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { FlyControls } from 'three/addons/controls/FlyControls.js';
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let container;
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let camera, scene, renderer, controls;
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const clock = new THREE.Clock();
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init();
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animate();
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function init() {
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container = document.createElement( 'div' );
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document.body.appendChild( container );
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camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 15000 );
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camera.position.z = 1000;
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scene = new THREE.Scene();
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scene.fog = new THREE.Fog( 0x000000, 1, 15000 );
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const pointLight = new THREE.PointLight( 0xff2200 );
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pointLight.position.set( 0, 0, 0 );
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scene.add( pointLight );
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const dirLight = new THREE.DirectionalLight( 0xffffff );
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dirLight.position.set( 0, 0, 1 ).normalize();
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scene.add( dirLight );
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const geometry = [
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[ new THREE.IcosahedronGeometry( 100, 16 ), 50 ],
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[ new THREE.IcosahedronGeometry( 100, 8 ), 300 ],
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[ new THREE.IcosahedronGeometry( 100, 4 ), 1000 ],
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[ new THREE.IcosahedronGeometry( 100, 2 ), 2000 ],
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[ new THREE.IcosahedronGeometry( 100, 1 ), 8000 ]
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];
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const material = new THREE.MeshLambertMaterial( { color: 0xffffff, wireframe: true } );
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for ( let j = 0; j < 1000; j ++ ) {
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const lod = new THREE.LOD();
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for ( let i = 0; i < geometry.length; i ++ ) {
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const mesh = new THREE.Mesh( geometry[ i ][ 0 ], material );
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mesh.scale.set( 1.5, 1.5, 1.5 );
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mesh.updateMatrix();
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mesh.matrixAutoUpdate = false;
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lod.addLevel( mesh, geometry[ i ][ 1 ] );
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}
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lod.position.x = 10000 * ( 0.5 - Math.random() );
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lod.position.y = 7500 * ( 0.5 - Math.random() );
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lod.position.z = 10000 * ( 0.5 - Math.random() );
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lod.updateMatrix();
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lod.matrixAutoUpdate = false;
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scene.add( lod );
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}
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.appendChild( renderer.domElement );
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//
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controls = new FlyControls( camera, renderer.domElement );
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controls.movementSpeed = 1000;
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controls.rollSpeed = Math.PI / 10;
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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requestAnimationFrame( animate );
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render();
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}
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function render() {
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controls.update( clock.getDelta() );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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