three.js Arcball Controls Camera Animation

by kimalbrecht

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
    
<script type="importmap">
	{
		"imports": {
			"three": "https://raw.githack.com/mrdoob/three.js/dev/build/three.module.js",
      "three/addons/": "https://raw.githack.com/mrdoob/three.js/dev/examples/jsm/"
		}
	}
</script>

CSS

body {
	margin: 0px;
}

JavaScript

// Simple three.js example

import * as THREE from 'three';
import { ArcballControls } from 'three/addons/controls/ArcballControls.js';

let mesh, renderer, scene, camera, controls;

init();
animate();

function init() {

    // renderer
    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    renderer.setPixelRatio( window.devicePixelRatio );
    document.body.appendChild( renderer.domElement );

    // scene
    scene = new THREE.Scene();
    
    // camera
    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
    camera.position.set( 20, 20, 20 );

    // controls
    controls = new ArcballControls( camera, renderer.domElement, scene );
    
    controls.cursorZoom = true;
    controls.enablePan = true;
    controls.enableRotate = false;

    controls.setMouseAction('PAN', 0);
    controls.setMouseAction('PAN', 1);
    controls.setMouseAction('PAN', 2);
    
    // ambient
    scene.add( new THREE.AmbientLight( 0x222222 ) );
    
    // light
    const light = new THREE.DirectionalLight( 0xffffff, 1 );
    light.position.set( 20,20, 0 );
    scene.add( light );
    
    // axes
    scene.add( new THREE.AxesHelper( 20 ) );

    // geometry
    const geometry = new THREE.SphereGeometry( 5, 12, 8 );
    
    // material
    const material = new THREE.MeshPhongMaterial( {
        color: 0x00ffff, 
        flatShading: true,
        transparent: true,
        opacity: 0.7,
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material );
    scene.add( mesh );
    
}

function animate() {

    requestAnimationFrame( animate );
    
    //controls.update();

    renderer.render( scene, camera );

}

controls.addEventListener( 'change', function () {

	renderer.render( scene, camera );

} );

function animateCamera () {

	gsap.to( camera.position, {
		duration: 1,
		x: Math.random()*10,
		y: Math.random()*10,
		z: 20,
		onUpdate: function() {
			animate();
     ...