javascript
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three.js
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							<!DOCTYPE html>
<html lang="en">

<head>
	<title>three.js webgl - materials - standard</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="http://threejs.org" target="_blank" rel="noopener">three.js</a> - Geometry Compression Example<br />
		Octahedron and Quantization encoding methods from <a>Tarek Sherif @tsherif</a>
	</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, PackedPhongMaterial } 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;


			// generateGeometry
			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>