midas
/
threejs-obj-space


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>threejs webgl - materials - transparency</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> - Transparency with Premultiplied Alpha (right) and without (left)</div>

		<script type="module">

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

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

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

			var params = {
				color: 0xffffff,
				transparency: 0.90,
				envMapIntensity: 1,
				lightIntensity: 1,
				exposure: 1
			};

			var container, stats;
			var camera, scene, renderer;

			var hdrCubeRenderTarget;
			var spotLight1, spotLight2;
			var mesh1, mesh2;

			var hdrEquirect = new RGBELoader()
				.setDataType( THREE.UnsignedByteType )
				.setPath( 'textures/equirectangular/' )
				.load( 'royal_esplanade_1k.hdr', function ( texture ) {

					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 );
				renderer.shadowMap.enabled = true;
				container.appendChild( renderer.domElement );

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

				renderer.outputEncoding = THREE.sRGBEncoding;

				scene = new THREE.Scene();
				scene.background = hdrEquirect;

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

				//

				var pmremGenerator = new THREE.PMREMGenerator( renderer );
				hdrCubeRenderTarget = pmremGenerator.fromEquirectangular( hdrEquirect );
				hdrEquirect.dispose();
				pmremGenerator.dispose();

				scene.background = hdrCubeRenderTarget.texture;

				//

				var geometry = new THREE.SphereBufferGeometry( 20, 64, 32 );

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

				var material = new THREE.MeshPhysicalMaterial( {
					color: params.color,
					metalness: 0,
					roughness: 0,
					alphaMap: texture,
					alphaTest: 0.5,
					envMap: hdrCubeRenderTarget.texture,
					envMapIntensity: params.envMapIntensity,
					depthTest: false,
					transparency: params.transparency,
					transparent: true
				} );

				var material1 = new THREE.MeshPhysicalMaterial().copy( material );

				var material1b = new THREE.MeshPhysicalMaterial().copy( material );
				material1b.side = THREE.BackSide;

				var material2 = new THREE.MeshPhysicalMaterial().copy( material );
				material2.premultipliedAlpha = true;

				var material2b = new THREE.MeshPhysicalMaterial().copy( material );
				material2b.premultipliedAlpha = true;
				material2b.side = THREE.BackSide;

				mesh1 = new THREE.Mesh( geometry, material1 );
				mesh1.position.x = - 30.0;
				scene.add( mesh1 );

				var mesh = new THREE.Mesh( geometry, material1b );
				mesh.renderOrder = - 1;
				mesh1.add( mesh );

				mesh2 = new THREE.Mesh( geometry, material2 );
				mesh2.position.x = 30.0;
				scene.add( mesh2 );

				var mesh = new THREE.Mesh( geometry, material2b );
				mesh.renderOrder = - 1;
				mesh2.add( mesh );

				//

				spotLight1 = new THREE.SpotLight( 0xffffff, params.lightIntensity );
				spotLight1.position.set( 100, 200, 100 );
				spotLight1.angle = Math.PI / 6;
				scene.add( spotLight1 );

				spotLight2 = new THREE.SpotLight( 0xffffff, params.lightIntensity );
				spotLight2.position.set( - 100, - 200, - 100 );
				spotLight2.angle = Math.PI / 6;
				scene.add( spotLight2 );

				//

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

				var controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 10;
				controls.maxDistance = 150;

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

				//

				var gui = new GUI();

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

						material1.color.set( params.color );
						material2.color.set( params.color );
						material1b.color.set( params.color );
						material2b.color.set( params.color );

					} );

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

						material1.transparency = material2.transparency = params.transparency;
						material1b.transparency = material2b.transparency = params.transparency;

					} );

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

						material1.envMapIntensity = material2.envMapIntensity = params.envMapIntensity;
						material1b.envMapIntensity = material2b.envMapIntensity = params.envMapIntensity;

					} );

				gui.add( params, 'lightIntensity', 0, 1 )
					.name( 'light intensity' )
					.onChange( function () {

						spotLight1.intensity = spotLight2.intensity = params.lightIntensity;

					} );

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

						renderer.toneMappingExposure = params.exposure;

					} );

				gui.open();

			}

			function onWindowResize() {

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

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

				renderer.setSize( width, height );

			}

			//

			function generateTexture() {

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

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

				return canvas;

			}

			function animate() {

				requestAnimationFrame( animate );

				var t = performance.now();

				mesh1.rotation.x = mesh2.rotation.x = t * 0.0002;
				mesh1.rotation.z = mesh2.rotation.z = - t * 0.0002;

				stats.begin();
				renderer.render( scene, camera );
				stats.end();

			}

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