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<title>three.js webgl - level of detail</title>
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - level of detail
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<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import { FlyControls } from 'three/addons/controls/FlyControls.js';
let container;
let camera, scene, renderer, controls;
const 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;
scene = new THREE.Scene();
scene.fog = new THREE.Fog( 0x000000, 1, 15000 );
const pointLight = new THREE.PointLight( 0xff2200, 3, 0, 0 );
pointLight.position.set( 0, 0, 0 );
scene.add( pointLight );
const dirLight = new THREE.DirectionalLight( 0xffffff, 3 );
dirLight.position.set( 0, 0, 1 ).normalize();
scene.add( dirLight );
const geometry = [
[ new THREE.IcosahedronGeometry( 100, 16 ), 50 ],
[ new THREE.IcosahedronGeometry( 100, 8 ), 300 ],
[ new THREE.IcosahedronGeometry( 100, 4 ), 1000 ],
[ new THREE.IcosahedronGeometry( 100, 2 ), 2000 ],
[ new THREE.IcosahedronGeometry( 100, 1 ), 8000 ]
];
const material = new THREE.MeshLambertMaterial( { color: 0xffffff, wireframe: true } );
for ( let j = 0; j < 1000; j ++ ) {
const lod = new THREE.LOD();
for ( let i = 0; i < geometry.length; i ++ ) {
const 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( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
controls = new FlyControls( camera, renderer.domElement );
controls.movementSpeed = 1000;
controls.rollSpeed = Math.PI / 10;
//
window.addEventListener( 'resize', onWindowResize );
}
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() );
renderer.render( scene, camera );
}
</script>
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