examples/webgl_buffergeometry_morphtargets.html

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<html lang="en">
	<head>
		<title>three.js webgl - buffergeometry - morph targets</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 {
				font-family: Monospace;
				font-size: 13px;
				margin: 0px;
				overflow: hidden;
				text-align: center;
			}

			#info {
				color: #fff;
				position: absolute;
				top: 10px;
				width: 100%;
			}

		</style>
	</head>

	<body>
		<div id="container"></div>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - buffergeometry - morph targets
		</div>

		<script src="../build/three.js"></script>

		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/WebGL.js"></script>
		<script src="js/libs/dat.gui.min.js"></script>

		<script>

			var container, camera, scene, renderer, mesh;

			function init() {

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

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

				}

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x8FBCD4 );

				scene.add( new THREE.AmbientLight( 0x8FBCD4, 0.4 ) );

				container = document.getElementById( 'container' );
				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 20 );
				camera.position.z = 8;
				scene.add( camera );

				var controls = new THREE.OrbitControls( camera, container );

				var pointLight = new THREE.PointLight( 0xffffff, 1 );
				camera.add( pointLight );

				var geometry = createGeometry();

				var material = new THREE.MeshPhongMaterial( {
					color: 0xff0000,
					flatShading: true,
					morphTargets: true
				} );

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

				initGUI();

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

				renderer.setAnimationLoop( function () {

					renderer.render( scene, camera );

				} );

				container.appendChild( renderer.domElement );


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

			}

			function createGeometry() {

				var geometry = new THREE.BoxBufferGeometry( 2, 2, 2, 32, 32, 32 );

				// create an empty array to  hold targets for the attribute we want to morph
				// morphing positions and normals is supported
				geometry.morphAttributes.position = [];

				// the original positions of the cube's vertices
				var positions = geometry.attributes.position.array;

				// for the first morph target we'll move the cube's vertices onto the surface of a sphere
				var spherePositions = [];

				// for the second morph target, we'll twist the cubes vertices
				var twistPositions = [];
				var direction = new THREE.Vector3( 1, 0, 0 ).normalize();
				var vertex = new THREE.Vector3();

				for ( var i = 0; i < positions.length; i += 3 ) {

					var x = positions[ i ];
					var y = positions[ i + 1 ];
					var z = positions[ i + 2 ];

					spherePositions.push(

						x * Math.sqrt( 1 - ( y * y / 2 ) - ( z * z / 2 ) + ( y * y * z * z / 3 ) ),
						y * Math.sqrt( 1 - ( z * z / 2 ) - ( x * x / 2 ) + ( z * z * x * x / 3 ) ),
						z * Math.sqrt( 1 - ( x * x / 2 ) - ( y * y / 2 ) + ( x * x * y * y / 3 ) )

					);

					// stretch along the x-axis so we can see the twist better
					vertex.set( x * 2, y, z );

					vertex.applyAxisAngle( direction, Math.PI * x / 2 ).toArray( twistPositions, twistPositions.length );

				}

				// add the spherical positions as the first morph target
				geometry.morphAttributes.position[ 0 ] = new THREE.Float32BufferAttribute( spherePositions, 3 );

				// add the twisted positions as the second morph target
				geometry.morphAttributes.position[ 1 ] = new THREE.Float32BufferAttribute( twistPositions, 3 );

				return geometry;

			}

			function initGUI() {

				// Set up dat.GUI to control targets
				var params = {
					Spherify: 0,
					Twist: 0,
				};
				var gui = new dat.GUI();
				var folder = gui.addFolder( 'Morph Targets' );

				folder.add( params, 'Spherify', 0, 1 ).step( 0.01 ).onChange( function ( value ) {

					mesh.morphTargetInfluences[ 0 ] = value;

				} );
				folder.add( params, 'Twist', 0, 1 ).step( 0.01 ).onChange( function ( value ) {

					mesh.morphTargetInfluences[ 1 ] = value;

				} );

				folder.open();

			}

			function onWindowResize() {

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

			}

			init();
		</script>

	</body>
</html>