examples/webgl_refraction.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js refraction</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				background:#777;
				padding:0;
				margin:0;
				font-weight: bold;
				overflow:hidden;
			}

			#info {
				position: absolute;
				top: 0px;
				width: 100%;
				color: #ffffff;
				padding: 5px;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
			}

			a {
				color: #ffffff;
			}
		</style>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/shaders/WaterRefractionShader.js"></script>
		<script src="js/objects/Refractor.js"></script>
		<script src="js/WebGL.js"></script>

	</head>
	<body>

		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> refraction
		</div>

		<script>

		if ( WEBGL.isWebGLAvailable() === false ) {

			document.body.appendChild( WEBGL.getWebGLErrorMessage() );

		}

		var scene, camera, clock, renderer, refractor, controls;

		init();

		function init() {

			// scene

			scene = new THREE.Scene();

			// camera

			camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
			camera.position.set( - 10, 0, 15 );
			camera.lookAt( scene.position );

			// clock

			clock = new THREE.Clock();

			// mesh

			var geometry = new THREE.TorusKnotBufferGeometry( 3, 1, 256, 32 );
			var material = new THREE.MeshStandardMaterial( { color: 0x6083c2 } );

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

			// refractor

			var refractorGeometry = new THREE.PlaneBufferGeometry( 10, 10 );

			refractor = new THREE.Refractor( refractorGeometry, {
				color: 0x999999,
				textureWidth: 1024,
				textureHeight: 1024,
				shader: THREE.WaterRefractionShader
			} );

			refractor.position.set( 0, 0, 5 );

			scene.add( refractor );

			// load dudv map for distortion effect

			var dudvMap = new THREE.TextureLoader().load( 'textures/waterdudv.jpg', function () {

				animate();

			} );

			dudvMap.wrapS = dudvMap.wrapT = THREE.RepeatWrapping;
			refractor.material.uniforms[ "tDudv" ].value = dudvMap;

			// light

			var ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
			scene.add( ambientLight );

			var pointLight = new THREE.PointLight( 0xffffff, 0.8 );
			camera.add( pointLight );
			scene.add( camera );

			// renderer

			renderer = new THREE.WebGLRenderer( { antialias: true } );
			renderer.setSize( window.innerWidth, window.innerHeight );
			renderer.setClearColor( 0x20252f );
			renderer.setPixelRatio( window.devicePixelRatio );
			document.body.appendChild( renderer.domElement );

			//

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

			//

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

		}

		function onResize() {

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

		}

		function animate() {

			requestAnimationFrame( animate );

			render();

		}

		function render() {

			refractor.material.uniforms[ "time" ].value += clock.getDelta();

			renderer.render( scene, camera );

		}

	</script>

</body>
</html>