midas
/
threejs-obj-space


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124
							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - math - orientation transform</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="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - gradually transform an orientation to a target orientation
		</div>

		<script type="module">

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

			var camera, scene, renderer, mesh, target;

			var spherical = new THREE.Spherical();
			var rotationMatrix = new THREE.Matrix4();
			var targetQuaternion = new THREE.Quaternion();
			var clock = new THREE.Clock();
			var speed = 2;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
				camera.position.z = 5;

				scene = new THREE.Scene();

				var geometry = new THREE.ConeBufferGeometry( 0.1, 0.5, 8 );
				geometry.rotateX( Math.PI * 0.5 );
				var material = new THREE.MeshNormalMaterial();

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

				//

				var targetGeometry = new THREE.SphereBufferGeometry( 0.05 );
				var targetMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
				target = new THREE.Mesh( targetGeometry, targetMaterial );
				scene.add( target );

				//

				var sphereGeometry = new THREE.SphereBufferGeometry( 2, 32, 32 );
				var sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xcccccc, wireframe: true, transparent: true, opacity: 0.3 } );
				var sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
				scene.add( sphere );

				//

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

				//

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

				//

				generateTarget();

			}

			function onResize() {

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

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

			}

			function animate() {

				requestAnimationFrame( animate );

				var delta = clock.getDelta();

				if ( ! mesh.quaternion.equals( targetQuaternion ) ) {

					var step = speed * delta;
					mesh.quaternion.rotateTowards( targetQuaternion, step );

				}

				renderer.render( scene, camera );

			}

			function generateTarget() {

				// generate a random point on a sphere

				spherical.theta = Math.random() * Math.PI * 2;
				spherical.phi = Math.acos( ( 2 * Math.random() ) - 1 );
				spherical.radius = 2;

				target.position.setFromSpherical( spherical );

				// compute target rotation

				rotationMatrix.lookAt( target.position, mesh.position, mesh.up );
				targetQuaternion.setFromRotationMatrix( rotationMatrix );

				setTimeout( generateTarget, 2000 );

			}

	</script>

</body>
</html>