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webgl_buffergeometry_compression.html
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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>