examples/misc_animation_groups.html

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<html lang="en">
	<head>
		<title>three.js webgl - animation - groups</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="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - animation - groups
		</div>

		<script type="module">

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

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

			var stats, clock;
			var scene, camera, renderer, mixer;

			init();
			animate();

			function init() {

				scene = new THREE.Scene();

				//

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 50, 50, 100 );
				camera.lookAt( scene.position );

				// all objects of this animation group share a common animation state

				var animationGroup = new THREE.AnimationObjectGroup();

				//

				var geometry = new THREE.BoxBufferGeometry( 5, 5, 5 );
				var material = new THREE.MeshBasicMaterial( { transparent: true } );

				//

				for ( var i = 0; i < 5; i ++ ) {

					for ( var j = 0; j < 5; j ++ ) {

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

						mesh.position.x = 32 - ( 16 * i );
						mesh.position.y = 0;
						mesh.position.z = 32 - ( 16 * j );

						scene.add( mesh );
						animationGroup.add( mesh );

					}

				}

				// create some keyframe tracks

				var xAxis = new THREE.Vector3( 1, 0, 0 );
				var qInitial = new THREE.Quaternion().setFromAxisAngle( xAxis, 0 );
				var qFinal = new THREE.Quaternion().setFromAxisAngle( xAxis, Math.PI );
				var quaternionKF = new THREE.QuaternionKeyframeTrack( '.quaternion', [ 0, 1, 2 ], [ qInitial.x, qInitial.y, qInitial.z, qInitial.w, qFinal.x, qFinal.y, qFinal.z, qFinal.w, qInitial.x, qInitial.y, qInitial.z, qInitial.w ] );

				var colorKF = new THREE.ColorKeyframeTrack( '.material.color', [ 0, 1, 2 ], [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ], THREE.InterpolateDiscrete );
				var opacityKF = new THREE.NumberKeyframeTrack( '.material.opacity', [ 0, 1, 2 ], [ 1, 0, 1 ] );

				// create clip

				var clip = new THREE.AnimationClip( 'default', 3, [ quaternionKF, colorKF, opacityKF ] );

				// apply the animation group to the mixer as the root object

				mixer = new THREE.AnimationMixer( animationGroup );

				var clipAction = mixer.clipAction( clip );
				clipAction.play();

				//

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

				//

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				clock = new THREE.Clock();

				//

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

			}

			function onWindowResize() {

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

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

			}

			function animate() {

				requestAnimationFrame( animate );

				render();

			}

			function render() {

				var delta = clock.getDelta();

				if ( mixer ) {

					mixer.update( delta );

				}

				renderer.render( scene, camera );

				stats.update();

			}

		</script>

	</body>
</html>