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138 lines
3.4 KiB
138 lines
3.4 KiB
2 years ago
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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 webgl - math - orientation transform</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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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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let camera, scene, renderer, mesh, target;
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const spherical = new THREE.Spherical();
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const rotationMatrix = new THREE.Matrix4();
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const targetQuaternion = new THREE.Quaternion();
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const clock = new THREE.Clock();
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const speed = 2;
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init();
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animate();
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function init() {
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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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scene = new THREE.Scene();
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const geometry = new THREE.ConeGeometry( 0.1, 0.5, 8 );
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geometry.rotateX( Math.PI * 0.5 );
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const material = new THREE.MeshNormalMaterial();
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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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const targetGeometry = new THREE.SphereGeometry( 0.05 );
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const 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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const sphereGeometry = new THREE.SphereGeometry( 2, 32, 32 );
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const sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xcccccc, wireframe: true, transparent: true, opacity: 0.3 } );
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const sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
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scene.add( sphere );
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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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window.addEventListener( 'resize', onWindowResize );
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//
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generateTarget();
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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requestAnimationFrame( animate );
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const delta = clock.getDelta();
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if ( ! mesh.quaternion.equals( targetQuaternion ) ) {
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const step = speed * delta;
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mesh.quaternion.rotateTowards( targetQuaternion, step );
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}
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renderer.render( scene, camera );
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}
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function generateTarget() {
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// generate a random point on a sphere
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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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target.position.setFromSpherical( spherical );
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// compute target rotation
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rotationMatrix.lookAt( target.position, mesh.position, mesh.up );
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targetQuaternion.setFromRotationMatrix( rotationMatrix );
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setTimeout( generateTarget, 2000 );
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}
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</script>
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</body>
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</html>
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