midas
/
threejs-obj-space


			
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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="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';

			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { GeometryCompressionUtils } from './jsm/utils/GeometryCompressionUtils.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';

			var statsEnabled = true;

			var container, stats, gui;

			var camera, scene, renderer, controls;

			var lights = [];

			// options
			var data = {
				"wireframe": false,
				"texture": false,
				"detail": 4,
				"rotationSpeed": 0.1,

				"quantizeEncodePos": false,

				"defaultEncodeNormal": false,
				"anglesEncodeNormal": false,
				"oct1bytesEncode": false,
				"oct2bytesEncode": false,

				"defaultEncodeUV": false,

				"totalGPUMemory": "0 bytes"
			};
			var memoryDisplay;

			// geometry params
			var radius = 100;

			// materials
			var lineMaterial = new THREE.LineBasicMaterial( { color: 0xaaaaaa, transparent: true, opacity: 0.8 } );
			var meshMaterial = new THREE.MeshPhongMaterial( { color: 0xffffff, emissive: 0x111111 } );

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

			//
			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, 0.01, 10000000 );
				camera.position.x = 2 * radius;
				camera.position.y = 2 * radius;
				camera.position.z = 2 * radius;

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

				//

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

				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 ) );

				//

				var ballGeom = newGeometry();

				var ballMesh = new THREE.Mesh( ballGeom, meshMaterial );
				var ballLineSegments = new THREE.LineSegments( new THREE.WireframeGeometry( ballGeom ), lineMaterial );
				ballLineSegments.visible = data.wireframe;

				scene.add( ballMesh );
				scene.add( ballLineSegments );

				//

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

				function newGeometry() {

					var geom = new THREE.IcosahedronBufferGeometry( radius, data.detail );
					// var geom = new THREE.CylinderBufferGeometry( 5, 5, 20, 32 );
					// var geom = new THREE.OctahedronBufferGeometry( radius, data.detail );
					// var geom = new THREE.BoxBufferGeometry(radius, radius, radius, data.detail, data.detail, data.detail);
					return geom;

				}

				function generateGeometry() {

					updateGroupGeometry(
						ballMesh,
						ballLineSegments,
						newGeometry(),
						data );

				}

				// updateLineSegments
				function updateLineSegments() {

					ballLineSegments.visible = data.wireframe;

				}

				var folder = gui.addFolder( 'Scene' );
				folder.open();
				folder.add( data, 'wireframe', false ).onChange( updateLineSegments );
				folder.add( data, 'texture', false ).onChange( generateGeometry );
				folder.add( data, 'detail', 0, 6, 1 ).onChange( generateGeometry );
				folder.add( data, 'rotationSpeed', 0, 0.5, 0.1 );

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

				folder = gui.addFolder( 'Normal Compression' );
				folder.open();
				folder.add( data, 'defaultEncodeNormal', false ).onChange( generateGeometry );
				folder.add( data, 'anglesEncodeNormal', false ).onChange( generateGeometry );
				folder.add( data, 'oct1bytesEncode', false ).onChange( generateGeometry );
				folder.add( data, 'oct2bytesEncode', false ).onChange( generateGeometry );

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

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

				//

				if ( statsEnabled ) {

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

				}

				window.addEventListener( 'resize', onWindowResize, false );

			}

			//

			function onWindowResize() {

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

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

			}

			//
			function updateLightsPossition() {

				lights.forEach( light => {

					var direction = light.position.clone();
					direction.applyAxisAngle( new THREE.Vector3( 1, 1, 0 ), data.rotationSpeed / 180 * Math.PI );
					light.position.add( direction.sub( light.position ) );

				} );

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				controls.update();
				updateLightsPossition();

				renderer.render( scene, camera );

				if ( statsEnabled ) stats.update();

			}

			//

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

				if ( geometry.isGeometry ) {

					geometry = new THREE.BufferGeometry().fromGeometry( geometry );

					console.warn( 'THREE.GeometryBrowser: Converted Geometry to BufferGeometry.' );

				}

				lineSegments.geometry.dispose();
				mesh.geometry.dispose();

				lineSegments.geometry = new THREE.WireframeGeometry( geometry );
				mesh.geometry = geometry;
				mesh.material = new THREE.MeshPhongMaterial( { color: 0xffffff, emissive: 0x111111 } );
				mesh.material.map = data.texture ? texture : null;

				var normalEncode = "";

				if ( data.oct1bytesEncode ) {

					/**
					 * It is not recommended to use 1-byte octahedron normals encoding unless you want to extremely reduce the memory usage
					 * As it makes vertex data not aligned to a 4 byte boundary which may harm some WebGL implementations and sometimes the normal distortion is visible
					 * Please refer to @zeux 's comments in https://github.com/mrdoob/three.js/pull/18208
					 */
					normalEncode = "OCT1Byte";

				} else if ( data.oct2bytesEncode ) {

					normalEncode = "OCT2Byte";

				} else if ( data.anglesEncodeNormal ) {

					normalEncode = "ANGLES";

				} else if ( data.defaultEncodeNormal ) {

					normalEncode = "DEFAULT";

				}

				if ( normalEncode != "" ) {

					GeometryCompressionUtils.compressNormals( mesh, normalEncode );

				}

				if ( data.quantizeEncodePos ) {

					GeometryCompressionUtils.compressPositions( mesh );

				}

				if ( data.defaultEncodeUV ) {

					GeometryCompressionUtils.compressUvs( mesh );

				}

				computeGPUMemory( mesh );

			}


			function computeGPUMemory( mesh ) {

				let posBytes = mesh.geometry.attributes.position.bytes || mesh.geometry.attributes.position.array.length * 4;
				let normBytes = mesh.geometry.attributes.normal.bytes || mesh.geometry.attributes.normal.array.length * 4;
				let uvBytes = mesh.geometry.attributes.uv.bytes || mesh.geometry.attributes.uv.array.length * 4;
				memoryDisplay.setValue( posBytes + normBytes + uvBytes + " bytes" );

			}

		</script>

	</body>
</html>