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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js transform orientation</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ background:#777;
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+ padding:0;
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+ margin:0;
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+ font-weight: bold;
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+ overflow:hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px;
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+ width: 100%;
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+ color: #ffffff;
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+ padding: 5px;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+ }
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+
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+ a {
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+ color: #ffffff;
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+ }
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+ </style>
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+
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+ <script src="../build/three.js"></script>
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+ <script src="js/controls/OrbitControls.js"></script>
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+ <script src="js/Detector.js"></script>
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+
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - gradually transform an orientation to a target orientation
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+ </div>
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+
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+ <script>
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+
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+ if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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+
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+ var camera, scene, renderer, mesh, target;
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+
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+ var spherical = new THREE.Spherical();
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+ var rotationMatrix = new THREE.Matrix4();
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+ var targetRotation = new THREE.Quaternion();
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+ var clock = new THREE.Clock();
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+ var speed = 2;
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
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+ camera.position.z = 5;
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+
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+ scene = new THREE.Scene();
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+
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+ var geometry = new THREE.ConeBufferGeometry( 0.2, 1, 8 );
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+ geometry.rotateX( Math.PI * 0.5 );
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+ var material = new THREE.MeshNormalMaterial();
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ //
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+
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+ var targetGeometry = new THREE.SphereBufferGeometry( 0.05 );
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+ var targetMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
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+ target = new THREE.Mesh( targetGeometry, targetMaterial );
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+ scene.add( target );
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+
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+ //
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+
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+ var sphereGeometry = new THREE.SphereBufferGeometry( 2, 32, 32 );
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+ var sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xcccccc, wireframe: true, transparent: true, opacity: 0.3 } );
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+ var sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
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+ scene.add( sphere );
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+
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+ //
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ document.body.appendChild( renderer.domElement );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onResize, false );
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+
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+ //
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+
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+ var controls = new THREE.OrbitControls( camera, renderer.domElement );
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+
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+ //
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+
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+ generateTarget();
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+
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+ }
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+
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+ function onResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ var delta = clock.getDelta();
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+
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+ if ( ! mesh.quaternion.equals( targetRotation ) ) {
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+
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+ var step = speed * delta;
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+ mesh.quaternion.transformTo( targetRotation, step );
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+
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+ }
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ function generateTarget() {
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+
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+ // generate a random points on a sphere
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+
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+ spherical.theta = Math.random() * Math.PI * 2;
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+ spherical.phi = Math.acos( ( 2 * Math.random() ) - 1 );
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+ spherical.radius = 2;
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+
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+ target.position.setFromSpherical( spherical );
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+
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+ // compute target rotation
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+
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+ rotationMatrix.lookAt( target.position, mesh.position, mesh.up );
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+ targetRotation.setFromRotationMatrix( rotationMatrix );
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+
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+ setTimeout( generateTarget, 2000 );
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+
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+ }
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+
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+ </script>
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+
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+</body>
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+</html>
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Mugen87