examples/webgl_points_morph.html

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	<head>
		<title>three.js webgl - particles - waves</title>
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			a {
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			#info {
				position: absolute;
				top: 5px;
				width: 100%;
			}
		</style>
	</head>
	<body>

		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particles morph example
			by <a href="https://discoverthreejs.com/" target="_blank" rel="noopener">Discover three.js</a>
		</div>

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

		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/loaders/GLTFLoader.js"></script>

		<script src="js/WebGL.js"></script>

		<script>

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

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

			}

			var container, camera, scene, renderer, mixer;
			var material, sizeAttribute;

			var time = 0;
			var clock = new THREE.Clock();

			init();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 500 );
				camera.position.z = 20;

				scene = new THREE.Scene();

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

				createMaterial();
				loadModel();

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

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

				renderer.setAnimationLoop( function () {

					renderer.render( scene, camera );
					controls.update();
					update();

				} );

			}

			function createMaterial() {

				material = new THREE.PointsMaterial( {

					map: new THREE.TextureLoader().load( 'textures/sprites/spark1.png' ),
					// size: 0.75,
					morphTargets: true,
					vertexColors: true,
					blending: THREE.AdditiveBlending,
					depthTest: false,

				} );

				// change the PointMaterial.size parameter from a uniform to an attribute
				material.onBeforeCompile = function ( shader ) {

					shader.vertexShader = shader.vertexShader.replace(
						'uniform float size;',
						'attribute float size;'
					);

				};

			}

			function createSizeAttribute( geometry ) {

				var count = geometry.attributes.position.count;

				var sizes = [];
				for ( var i = 0; i < count; i ++ ) {

					sizes.push( 1 );

				}
				sizeAttribute = new THREE.Float32BufferAttribute( sizes, 1 ).setDynamic( true );

				geometry.addAttribute( 'size', sizeAttribute );

			}

			function loadModel( ) {

				var loader = new THREE.GLTFLoader();
				loader.load( 'models/gltf/Horse.glb', function ( gltf ) {

					var model = gltf.scene.children[ 0 ];
					var animation = gltf.animations[ 0 ];

					createSizeAttribute( model.geometry );

					var points = new THREE.Points( model.geometry, material );
					points.position.y = - 3;
					points.rotation.y = Math.PI / 2;
					points.scale.multiplyScalar( 0.03 );

					points.morphTargetInfluences = model.morphTargetInfluences;
					points.morphTargetDictionary = model.morphTargetDictionary;

					mixer = new THREE.AnimationMixer( points );

					var action = mixer.clipAction( animation );
					action.play();

					scene.add( points );

				} );

			}

			function update() {

				if ( ! sizeAttribute || ! mixer ) return;

				var delta = clock.getDelta();

				time += delta * 5;

				mixer.update( delta );

				var count = sizeAttribute.count;

				for ( var i = 0; i < count; i ++ ) {

					sizeAttribute.array[ i ] = 0.75 + 0.5 * Math.sin( i + time );

				}

				sizeAttribute.needsUpdate = true;

			}

			function onWindowResize() {

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

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

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