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372 lines
7.2 KiB
372 lines
7.2 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 - instancing - performance</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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<style>
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#info {
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background-color: rgba(0,0,0,0.75);
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}
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.lil-gui .gui-stats {
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line-height: var(--widget-height);
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padding: var(--padding);
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}
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</style>
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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> webgl - instancing - performance
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</div>
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<div id="container"></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 Stats from 'three/addons/libs/stats.module.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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let container, stats, gui, guiStatsEl;
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let camera, controls, scene, renderer, material;
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// gui
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const Method = {
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INSTANCED: 'INSTANCED',
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MERGED: 'MERGED',
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NAIVE: 'NAIVE'
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};
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const api = {
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method: Method.INSTANCED,
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count: 1000
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};
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//
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init();
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initMesh();
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animate();
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//
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function clean() {
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const meshes = [];
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scene.traverse( function ( object ) {
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if ( object.isMesh ) meshes.push( object );
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} );
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for ( let i = 0; i < meshes.length; i ++ ) {
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const mesh = meshes[ i ];
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mesh.material.dispose();
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mesh.geometry.dispose();
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scene.remove( mesh );
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}
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}
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const randomizeMatrix = function () {
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const position = new THREE.Vector3();
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const rotation = new THREE.Euler();
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const quaternion = new THREE.Quaternion();
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const scale = new THREE.Vector3();
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return function ( matrix ) {
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position.x = Math.random() * 40 - 20;
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position.y = Math.random() * 40 - 20;
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position.z = Math.random() * 40 - 20;
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rotation.x = Math.random() * 2 * Math.PI;
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rotation.y = Math.random() * 2 * Math.PI;
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rotation.z = Math.random() * 2 * Math.PI;
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quaternion.setFromEuler( rotation );
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scale.x = scale.y = scale.z = Math.random() * 1;
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matrix.compose( position, quaternion, scale );
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};
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}();
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function initMesh() {
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clean();
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// make instances
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new THREE.BufferGeometryLoader()
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.setPath( 'models/json/' )
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.load( 'suzanne_buffergeometry.json', function ( geometry ) {
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material = new THREE.MeshNormalMaterial();
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geometry.computeVertexNormals();
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console.time( api.method + ' (build)' );
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switch ( api.method ) {
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case Method.INSTANCED:
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makeInstanced( geometry );
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break;
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case Method.MERGED:
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makeMerged( geometry );
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break;
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case Method.NAIVE:
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makeNaive( geometry );
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break;
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}
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console.timeEnd( api.method + ' (build)' );
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} );
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}
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function makeInstanced( geometry ) {
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const matrix = new THREE.Matrix4();
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const mesh = new THREE.InstancedMesh( geometry, material, api.count );
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for ( let i = 0; i < api.count; i ++ ) {
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randomizeMatrix( matrix );
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mesh.setMatrixAt( i, matrix );
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}
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scene.add( mesh );
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//
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const geometryByteLength = getGeometryByteLength( geometry );
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guiStatsEl.innerHTML = [
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'<i>GPU draw calls</i>: 1',
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'<i>GPU memory</i>: ' + formatBytes( api.count * 16 + geometryByteLength, 2 )
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].join( '<br/>' );
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}
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function makeMerged( geometry ) {
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const geometries = [];
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const matrix = new THREE.Matrix4();
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for ( let i = 0; i < api.count; i ++ ) {
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randomizeMatrix( matrix );
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const instanceGeometry = geometry.clone();
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instanceGeometry.applyMatrix4( matrix );
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geometries.push( instanceGeometry );
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}
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const mergedGeometry = BufferGeometryUtils.mergeBufferGeometries( geometries );
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scene.add( new THREE.Mesh( mergedGeometry, material ) );
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//
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guiStatsEl.innerHTML = [
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'<i>GPU draw calls</i>: 1',
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'<i>GPU memory</i>: ' + formatBytes( getGeometryByteLength( mergedGeometry ), 2 )
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].join( '<br/>' );
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}
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function makeNaive( geometry ) {
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const matrix = new THREE.Matrix4();
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for ( let i = 0; i < api.count; i ++ ) {
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randomizeMatrix( matrix );
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const mesh = new THREE.Mesh( geometry, material );
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mesh.applyMatrix4( matrix );
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scene.add( mesh );
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}
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//
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const geometryByteLength = getGeometryByteLength( geometry );
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guiStatsEl.innerHTML = [
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'<i>GPU draw calls</i>: ' + api.count,
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'<i>GPU memory</i>: ' + formatBytes( api.count * 16 + geometryByteLength, 2 )
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].join( '<br/>' );
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}
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function init() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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// camera
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camera = new THREE.PerspectiveCamera( 70, width / height, 1, 100 );
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camera.position.z = 30;
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// renderer
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( width, height );
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renderer.outputEncoding = THREE.sRGBEncoding;
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container = document.getElementById( 'container' );
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container.appendChild( renderer.domElement );
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// scene
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0xffffff );
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// controls
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controls = new OrbitControls( camera, renderer.domElement );
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controls.autoRotate = true;
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// stats
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stats = new Stats();
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container.appendChild( stats.dom );
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// gui
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gui = new GUI();
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gui.add( api, 'method', Method ).onChange( initMesh );
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gui.add( api, 'count', 1, 10000 ).step( 1 ).onChange( initMesh );
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const perfFolder = gui.addFolder( 'Performance' );
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guiStatsEl = document.createElement( 'div' );
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guiStatsEl.classList.add( 'gui-stats' );
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perfFolder.$children.appendChild( guiStatsEl );
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perfFolder.open();
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// listeners
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window.addEventListener( 'resize', onWindowResize );
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Object.assign( window, { scene } );
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}
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//
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function onWindowResize() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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camera.aspect = width / height;
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camera.updateProjectionMatrix();
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renderer.setSize( width, height );
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}
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function animate() {
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requestAnimationFrame( animate );
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controls.update();
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stats.update();
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render();
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}
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function render() {
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renderer.render( scene, camera );
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}
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//
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function getGeometryByteLength( geometry ) {
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let total = 0;
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if ( geometry.index ) total += geometry.index.array.byteLength;
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for ( const name in geometry.attributes ) {
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total += geometry.attributes[ name ].array.byteLength;
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}
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return total;
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}
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// Source: https://stackoverflow.com/a/18650828/1314762
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function formatBytes( bytes, decimals ) {
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if ( bytes === 0 ) return '0 bytes';
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const k = 1024;
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const dm = decimals < 0 ? 0 : decimals;
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const sizes = [ 'bytes', 'KB', 'MB' ];
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const i = Math.floor( Math.log( bytes ) / Math.log( k ) );
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return parseFloat( ( bytes / Math.pow( k, i ) ).toFixed( dm ) ) + ' ' + sizes[ i ];
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}
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</script>
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</body>
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</html>
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