examples/webgl_water_flowmap.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js - water flow map</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/objects/Reflector.js"></script>
		<script src="js/objects/Refractor.js"></script>
		<script src="js/objects/Water2.js"></script>
		<script src="js/WebGL.js"></script>
		<script src="js/libs/dat.gui.min.js"></script>

	</head>
	<body>

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

		<script>

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

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

		}

		var scene, camera, renderer, water;

		init();
		animate();

		function init() {

			// scene

			scene = new THREE.Scene();

			// camera

			camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 1000 );
			camera.position.set( 0, 25, 0 );
			camera.lookAt( scene.position );

			// ground

			var groundGeometry = new THREE.PlaneBufferGeometry( 20, 20, 10, 10 );
			var groundMaterial = new THREE.MeshBasicMaterial( { color: 0xcccccc } );
			var ground = new THREE.Mesh( groundGeometry, groundMaterial );
			ground.rotation.x = Math.PI * - 0.5;
			scene.add( ground );

			var textureLoader = new THREE.TextureLoader();
			textureLoader.load( 'textures/floors/FloorsCheckerboard_S_Diffuse.jpg', function ( map ) {

				map.wrapS = THREE.RepeatWrapping;
				map.wrapT = THREE.RepeatWrapping;
				map.anisotropy = 16;
				map.repeat.set( 4, 4 );
				groundMaterial.map = map;
				groundMaterial.needsUpdate = true;

			} );

			// water

			var waterGeometry = new THREE.PlaneBufferGeometry( 20, 20 );
			var flowMap = textureLoader.load( 'textures/water/Water_1_M_Flow.jpg' );

			water = new THREE.Water( waterGeometry, {
				scale: 2,
				textureWidth: 1024,
				textureHeight: 1024,
				flowMap: flowMap
			} );

			water.position.y = 1;
			water.rotation.x = Math.PI * - 0.5;
			scene.add( water );

			// flow map helper

			var helperGeometry = new THREE.PlaneBufferGeometry( 20, 20 );
			var helperMaterial = new THREE.MeshBasicMaterial( { map: flowMap } );
			var helper = new THREE.Mesh( helperGeometry, helperMaterial );
			helper.position.y = 1.01;
			helper.rotation.x = Math.PI * - 0.5;
			helper.visible = false;
			scene.add( helper );

			// renderer

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

			//

			var gui = new dat.GUI();
			gui.add( helper, 'visible' ).name( 'Show Flow Map' );
			gui.open();

			//

			var 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() {

			renderer.render( scene, camera );

		}

	</script>

</body>
</html>