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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - mesh - batch</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">
- <style>
- #info {
- background-color: rgba(0,0,0,0.75);
- }
- </style>
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - mesh - batch
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import Stats from 'three/addons/libs/stats.module.js';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { radixSort } from 'three/addons/utils/SortUtils.js';
- let stats, gui, guiStatsEl;
- let camera, controls, scene, renderer;
- let geometries, mesh, material;
- const ids = [];
- const matrix = new THREE.Matrix4();
- //
- const position = new THREE.Vector3();
- const rotation = new THREE.Euler();
- const quaternion = new THREE.Quaternion();
- const scale = new THREE.Vector3();
- //
- const MAX_GEOMETRY_COUNT = 20000;
- const Method = {
- BATCHED: 'BATCHED',
- NAIVE: 'NAIVE'
- };
- const api = {
- method: Method.BATCHED,
- count: 256,
- dynamic: 16,
- sortObjects: true,
- perObjectFrustumCulled: true,
- opacity: 1,
- useCustomSort: true,
- };
- init();
- initGeometries();
- initMesh();
- //
- function randomizeMatrix( matrix ) {
- position.x = Math.random() * 40 - 20;
- position.y = Math.random() * 40 - 20;
- position.z = Math.random() * 40 - 20;
- rotation.x = Math.random() * 2 * Math.PI;
- rotation.y = Math.random() * 2 * Math.PI;
- rotation.z = Math.random() * 2 * Math.PI;
- quaternion.setFromEuler( rotation );
- scale.x = scale.y = scale.z = 0.5 + ( Math.random() * 0.5 );
- return matrix.compose( position, quaternion, scale );
- }
- function randomizeRotationSpeed( rotation ) {
- rotation.x = Math.random() * 0.01;
- rotation.y = Math.random() * 0.01;
- rotation.z = Math.random() * 0.01;
- return rotation;
- }
- function initGeometries() {
- geometries = [
- new THREE.ConeGeometry( 1.0, 2.0 ),
- new THREE.BoxGeometry( 2.0, 2.0, 2.0 ),
- new THREE.SphereGeometry( 1.0, 16, 8 ),
- ];
- }
- function createMaterial() {
- if ( ! material ) {
- material = new THREE.MeshNormalMaterial();
- }
- return material;
- }
- function cleanup() {
- if ( mesh ) {
- mesh.parent.remove( mesh );
- if ( mesh.dispose ) {
- mesh.dispose();
- }
- }
- }
- function initMesh() {
- cleanup();
- if ( api.method === Method.BATCHED ) {
- initBatchedMesh();
- } else {
- initRegularMesh();
- }
- }
- function initRegularMesh() {
- mesh = new THREE.Group();
- const material = createMaterial();
- for ( let i = 0; i < api.count; i ++ ) {
- const child = new THREE.Mesh( geometries[ i % geometries.length ], material );
- randomizeMatrix( child.matrix );
- child.matrix.decompose( child.position, child.quaternion, child.scale );
- child.userData.rotationSpeed = randomizeRotationSpeed( new THREE.Euler() );
- mesh.add( child );
- }
- scene.add( mesh );
- }
- function initBatchedMesh() {
- const geometryCount = api.count;
- const vertexCount = geometries.length * 512;
- const indexCount = geometries.length * 1024;
- const euler = new THREE.Euler();
- const matrix = new THREE.Matrix4();
- mesh = new THREE.BatchedMesh( geometryCount, vertexCount, indexCount, createMaterial() );
- mesh.userData.rotationSpeeds = [];
- // disable full-object frustum culling since all of the objects can be dynamic.
- mesh.frustumCulled = false;
- ids.length = 0;
- const geometryIds = [
- mesh.addGeometry( geometries[ 0 ] ),
- mesh.addGeometry( geometries[ 1 ] ),
- mesh.addGeometry( geometries[ 2 ] ),
- ];
- for ( let i = 0; i < api.count; i ++ ) {
- const id = mesh.addInstance( geometryIds[ i % geometryIds.length ] );
- mesh.setMatrixAt( id, randomizeMatrix( matrix ) );
- const rotationMatrix = new THREE.Matrix4();
- rotationMatrix.makeRotationFromEuler( randomizeRotationSpeed( euler ) );
- mesh.userData.rotationSpeeds.push( rotationMatrix );
- ids.push( id );
- }
- scene.add( mesh );
- }
- function init() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- // camera
- camera = new THREE.PerspectiveCamera( 70, width / height, 1, 100 );
- camera.position.z = 30;
- // renderer
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( width, height );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- // scene
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0xffffff );
- // controls
- controls = new OrbitControls( camera, renderer.domElement );
- controls.autoRotate = true;
- controls.autoRotateSpeed = 1.0;
- // stats
- stats = new Stats();
- document.body.appendChild( stats.dom );
- // gui
- gui = new GUI();
- gui.add( api, 'count', 1, MAX_GEOMETRY_COUNT ).step( 1 ).onChange( initMesh );
- gui.add( api, 'dynamic', 0, MAX_GEOMETRY_COUNT ).step( 1 );
- gui.add( api, 'method', Method ).onChange( initMesh );
- gui.add( api, 'opacity', 0, 1 ).onChange( v => {
- if ( v < 1 ) {
- material.transparent = true;
- material.depthWrite = false;
- } else {
- material.transparent = false;
- material.depthWrite = true;
- }
- material.opacity = v;
- material.needsUpdate = true;
- } );
- gui.add( api, 'sortObjects' );
- gui.add( api, 'perObjectFrustumCulled' );
- gui.add( api, 'useCustomSort' );
- guiStatsEl = document.createElement( 'li' );
- guiStatsEl.classList.add( 'gui-stats' );
- // listeners
- window.addEventListener( 'resize', onWindowResize );
- }
- //
- function sortFunction( list ) {
- // initialize options
- this._options = this._options || {
- get: el => el.z,
- aux: new Array( this.maxInstanceCount )
- };
- const options = this._options;
- options.reversed = this.material.transparent;
- let minZ = Infinity;
- let maxZ = - Infinity;
- for ( let i = 0, l = list.length; i < l; i ++ ) {
- const z = list[ i ].z;
- if ( z > maxZ ) maxZ = z;
- if ( z < minZ ) minZ = z;
- }
- // convert depth to unsigned 32 bit range
- const depthDelta = maxZ - minZ;
- const factor = ( 2 ** 32 - 1 ) / depthDelta; // UINT32_MAX / z range
- for ( let i = 0, l = list.length; i < l; i ++ ) {
- list[ i ].z -= minZ;
- list[ i ].z *= factor;
- }
- // perform a fast-sort using the hybrid radix sort function
- radixSort( list, options );
- }
- function onWindowResize() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- camera.aspect = width / height;
- camera.updateProjectionMatrix();
- renderer.setSize( width, height );
- }
- function animate() {
- animateMeshes();
- controls.update();
- stats.update();
- render();
- }
- function animateMeshes() {
- const loopNum = Math.min( api.count, api.dynamic );
- if ( api.method === Method.BATCHED ) {
- for ( let i = 0; i < loopNum; i ++ ) {
- const rotationMatrix = mesh.userData.rotationSpeeds[ i ];
- const id = ids[ i ];
- mesh.getMatrixAt( id, matrix );
- matrix.multiply( rotationMatrix );
- mesh.setMatrixAt( id, matrix );
- }
- } else {
- for ( let i = 0; i < loopNum; i ++ ) {
- const child = mesh.children[ i ];
- const rotationSpeed = child.userData.rotationSpeed;
- child.rotation.set(
- child.rotation.x + rotationSpeed.x,
- child.rotation.y + rotationSpeed.y,
- child.rotation.z + rotationSpeed.z
- );
- }
- }
- }
- function render() {
- if ( mesh.isBatchedMesh ) {
- mesh.sortObjects = api.sortObjects;
- mesh.perObjectFrustumCulled = api.perObjectFrustumCulled;
- mesh.setCustomSort( api.useCustomSort ? sortFunction : null );
- }
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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