javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - buffergeometry - compression</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="https://threejs.org" target="_blank" rel="noopener">three.js</a> - BufferGeometry Compression<br />
			Octahedron and Quantization encoding methods from Tarek Sherif
		</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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import * as GeometryCompressionUtils from 'three/addons/utils/GeometryCompressionUtils.js';
			import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
			import { TeapotGeometry } from 'three/addons/geometries/TeapotGeometry.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			const statsEnabled = true;

			let container, stats, gui;

			let camera, scene, renderer, controls;

			const lights = [];

			// options
			const data = {
				'model': 'Icosahedron',
				'wireframe': false,
				'texture': false,
				'detail': 4,

				'QuantizePosEncoding': false,
				'NormEncodingMethods': 'None', // for normal encodings
				'DefaultUVEncoding': false,

				'totalGPUMemory': '0 bytes'
			};
			let memoryDisplay;

			// geometry params
			const radius = 100;

			// materials
			const lineMaterial = new THREE.LineBasicMaterial( { color: 0xaaaaaa, transparent: true, opacity: 0.8 } );
			const meshMaterial = new THREE.MeshPhongMaterial( { color: 0xffffff, side: THREE.DoubleSide } );

			// texture
			const texture = new THREE.TextureLoader().load( 'textures/uv_grid_opengl.jpg' );
			texture.wrapS = THREE.RepeatWrapping;
			texture.wrapT = THREE.RepeatWrapping;
			texture.colorSpace = THREE.SRGBColorSpace;

			//
			init();
			animate();


			function init() {

				//

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

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				//

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.setScalar( 2 * radius );

				controls = new OrbitControls( camera, renderer.domElement );
				controls.enablePan = false;
				controls.enableZoom = false;

				//

				scene.add( new THREE.AmbientLight( 0xffffff, 0.3 ) );

				lights[ 0 ] = new THREE.DirectionalLight( 0xffffff, 2.5 );
				lights[ 1 ] = new THREE.DirectionalLight( 0xffffff, 2.5 );
				lights[ 2 ] = new THREE.DirectionalLight( 0xffffff, 2.5 );

				lights[ 0 ].position.set( 0, 2 * radius, 0 );
				lights[ 1 ].position.set( 2 * radius, - 2 * radius, 2 * radius );
				lights[ 2 ].position.set( - 2 * radius, - 2 * radius, - 2 * radius );

				scene.add( lights[ 0 ] );
				scene.add( lights[ 1 ] );
				scene.add( lights[ 2 ] );

				//

				scene.add( new THREE.AxesHelper( radius * 5 ) );

				//

				let geom = newGeometry( data );

				const mesh = new THREE.Mesh( geom, meshMaterial );
				scene.add( mesh );

				const lineSegments = new THREE.LineSegments( new THREE.WireframeGeometry( geom ), lineMaterial );
				lineSegments.visible = data.wireframe;

				scene.add( lineSegments );

				//

				gui = new GUI();
				gui.width = 350;

				function newGeometry( data ) {

					switch ( data.model ) {

						case 'Icosahedron':
							return new THREE.IcosahedronGeometry( radius, data.detail );
						case 'Cylinder':
							return new THREE.CylinderGeometry( radius / 1.5, radius / 1.5, radius, data.detail * 6 );
						case 'Teapot':
							return new TeapotGeometry( radius / 1.5, data.detail * 3, true, true, true, true, true );
						case 'TorusKnot':
							return new THREE.TorusKnotGeometry( radius / 2, 10, data.detail * 30, data.detail * 6, 3, 4 );

					}

				}

				function generateGeometry() {

					geom = newGeometry( data );

					updateGroupGeometry( mesh, lineSegments, geom, data );

				}

				function updateLineSegments() {

					lineSegments.visible = data.wireframe;

				}

				let folder = gui.addFolder( 'Scene' );
				folder.add( data, 'model', [ 'Icosahedron', 'Cylinder', 'TorusKnot', 'Teapot' ] ).onChange( generateGeometry );
				folder.add( data, 'wireframe', false ).onChange( updateLineSegments );
				folder.add( data, 'texture', false ).onChange( generateGeometry );
				folder.add( data, 'detail', 1, 8, 1 ).onChange( generateGeometry );
				folder.open();

				folder = gui.addFolder( 'Position Compression' );
				folder.add( data, 'QuantizePosEncoding', false ).onChange( generateGeometry );
				folder.open();

				folder = gui.addFolder( 'Normal Compression' );
				folder.add( data, 'NormEncodingMethods', [ 'None', 'DEFAULT', 'OCT1Byte', 'OCT2Byte', 'ANGLES' ] ).onChange( generateGeometry );
				folder.open();

				folder = gui.addFolder( 'UV Compression' );
				folder.add( data, 'DefaultUVEncoding', false ).onChange( generateGeometry );
				folder.open();

				folder = gui.addFolder( 'Memory Info' );
				folder.open();
				memoryDisplay = folder.add( data, 'totalGPUMemory', '0 bytes' );
				computeGPUMemory( mesh );

				//

				if ( statsEnabled ) {

					stats = new Stats();
					container.appendChild( stats.dom );

				}

				window.addEventListener( 'resize', onWindowResize );

			}

			//

			function onWindowResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );

				camera.aspect = window.innerWidth / window.innerHeight;

				camera.updateProjectionMatrix();

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				renderer.render( scene, camera );

				if ( statsEnabled ) stats.update();

			}

			//

			function updateGroupGeometry( mesh, lineSegments, geometry, data ) {

				// dispose first

				lineSegments.geometry.dispose();
				mesh.geometry.dispose();
				mesh.material.dispose();
				if ( mesh.material.map ) mesh.material.map.dispose();

				lineSegments.geometry = new THREE.WireframeGeometry( geometry );
				mesh.geometry = geometry;
				mesh.material = new THREE.MeshPhongMaterial( { color: 0xffffff, side: THREE.DoubleSide } );
				mesh.material.map = data.texture ? texture : null;

				if ( data[ 'QuantizePosEncoding' ] ) {

					GeometryCompressionUtils.compressPositions( mesh );

				}

				if ( data[ 'NormEncodingMethods' ] !== 'None' ) {

					GeometryCompressionUtils.compressNormals( mesh, data[ 'NormEncodingMethods' ] );

				}

				if ( data[ 'DefaultUVEncoding' ] ) {

					GeometryCompressionUtils.compressUvs( mesh );

				}

				computeGPUMemory( mesh );

			}


			function computeGPUMemory( mesh ) {

				// Use BufferGeometryUtils to do memory calculation

				memoryDisplay.setValue( BufferGeometryUtils.estimateBytesUsed( mesh.geometry ) + ' bytes' );

			}

		</script>

	</body>
</html>