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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>threejs webgl - materials - transmission</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="container"></div>
		<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">threejs</a> - Transmission</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';

			const params = {
				color: 0xffffff,
				transmission: 1,
				opacity: 1,
				metalness: 0,
				roughness: 0,
				ior: 1.5,
				thickness: 0.01,
				specularIntensity: 1,
				specularColor: 0xffffff,
				envMapIntensity: 1,
				lightIntensity: 1,
				exposure: 1
			};

			let camera, scene, renderer;

			let mesh;

			const hdrEquirect = new RGBELoader()
				.setPath( 'textures/equirectangular/' )
				.load( 'royal_esplanade_1k.hdr', function () {

					hdrEquirect.mapping = THREE.EquirectangularReflectionMapping;

					init();
					render();

				} );

			function init() {

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

				renderer.toneMapping = THREE.ACESFilmicToneMapping;
				renderer.toneMappingExposure = params.exposure;


				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.set( 0, 0, 120 );

				//

				scene.background = hdrEquirect;

				//

				const geometry = new THREE.SphereGeometry( 20, 64, 32 );

				const texture = new THREE.CanvasTexture( generateTexture() );
				texture.magFilter = THREE.NearestFilter;
				texture.wrapT = THREE.RepeatWrapping;
				texture.wrapS = THREE.RepeatWrapping;
				texture.repeat.set( 1, 3.5 );

				const material = new THREE.MeshPhysicalMaterial( {
					color: params.color,
					metalness: params.metalness,
					roughness: params.roughness,
					ior: params.ior,
					alphaMap: texture,
					envMap: hdrEquirect,
					envMapIntensity: params.envMapIntensity,
					transmission: params.transmission, // use material.transmission for glass materials
					specularIntensity: params.specularIntensity,
					specularColor: params.specularColor,
					opacity: params.opacity,
					side: THREE.DoubleSide,
					transparent: true
				} );

				mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

				//

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.addEventListener( 'change', render ); // use if there is no animation loop
				controls.minDistance = 10;
				controls.maxDistance = 150;

				window.addEventListener( 'resize', onWindowResize );

				//

				const gui = new GUI();

				gui.addColor( params, 'color' )
					.onChange( function () {

						material.color.set( params.color );
						render();

					} );

				gui.add( params, 'transmission', 0, 1, 0.01 )
					.onChange( function () {

						material.transmission = params.transmission;
						render();

					} );

				gui.add( params, 'opacity', 0, 1, 0.01 )
					.onChange( function () {

						material.opacity = params.opacity;
						render();

					} );

				gui.add( params, 'metalness', 0, 1, 0.01 )
					.onChange( function () {

						material.metalness = params.metalness;
						render();

					} );

				gui.add( params, 'roughness', 0, 1, 0.01 )
					.onChange( function () {

						material.roughness = params.roughness;
						render();

					} );

				gui.add( params, 'ior', 1, 2, 0.01 )
					.onChange( function () {

						material.ior = params.ior;
						render();

					} );

				gui.add( params, 'thickness', 0, 5, 0.01 )
					.onChange( function () {

						material.thickness = params.thickness;
						render();

					} );

				gui.add( params, 'specularIntensity', 0, 1, 0.01 )
					.onChange( function () {

						material.specularIntensity = params.specularIntensity;
						render();

					} );

				gui.addColor( params, 'specularColor' )
					.onChange( function () {

						material.specularColor.set( params.specularColor );
						render();

					} );

				gui.add( params, 'envMapIntensity', 0, 1, 0.01 )
					.name( 'envMap intensity' )
					.onChange( function () {

						material.envMapIntensity = params.envMapIntensity;
						render();

					} );

				gui.add( params, 'exposure', 0, 1, 0.01 )
					.onChange( function () {

						renderer.toneMappingExposure = params.exposure;
						render();

					} );

				gui.open();

			}

			function onWindowResize() {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );

				render();

			}

			//

			function generateTexture() {

				const canvas = document.createElement( 'canvas' );
				canvas.width = 2;
				canvas.height = 2;

				const context = canvas.getContext( '2d' );
				context.fillStyle = 'white';
				context.fillRect( 0, 1, 2, 1 );

				return canvas;

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>