Three.js - Trackball Controls

TrackballControls is similar to Orbit controls. However, it does not maintain a constant camera up vector. That means that the camera can orbit past its polar extremes. It won't flip to stay the right side up. You can add it just like the previous one.

const controls = new THREE.TrackballControls(camera, render.domElement)

Example

Check out the following example.

trackball-controls.html

<!DOCTYPE html>
<html lang="en">
   <head>
      <title>Three.js - Trackball controls</title>
      <meta charset="utf-8" />
      <meta name="viewport" content="width=device-width, user-scalable=no, minimumscale=1.0, maximum-scale=1.0"/>
      <style>
         body {
            background-color: #ccc;
            color: #000;
            font-family: -applesystem, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
            Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
         }
         a {
            color: #f00;
         }
         #info {
            position: absolute;
            top: 0px;
            width: 100%;
            padding: 10px;
            box-sizing: border-box;
            text-align: center;
            -moz-user-select: none;
            -webkit-user-select: none;
            -ms-user-select: none;
            user-select: none;
            pointer-events: none;
            z-index: 1; /* TODO Solve this in HTML */
         }
         a,
         button,
         input,
         select {
            pointer-events: auto;
         }
      </style>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.7/dat.gui.js"></script>
      <script src="http://mrdoob.github.io/stats.js/build/stats.min.js"></script>
   </head>
   <body>
      <div id="info">
         <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - trackball controls<br /> MOVE mouse & press LEFT/A: rotate, MIDDLE/S: zoom, RIGHT/D: pan
      </div>
      <script type="module">
         // Adding trackball controls
         // You can rotate camera any direction you want using Trackball controls
         import { TrackballControls } from 'https://threejs.org/examples/jsm/controls/TrackballControls.js'
         let perspectiveCamera, orthographicCamera, controls, scene, renderer, stats
         const params = {
            orthographicCamera: false
         }
         const frustumSize = 400
         init()
         animate()
         function init() {
            const aspect = window.innerWidth / window.innerHeight
            perspectiveCamera = new THREE.PerspectiveCamera(60, aspect, 1, 1000)
            perspectiveCamera.position.z = 500
            orthographicCamera = new THREE.OrthographicCamera(
               (frustumSize * aspect) / -2,
               (frustumSize * aspect) / 2,
               frustumSize / 2,
               frustumSize / -2,
               1,
               1000
            )
            orthographicCamera.position.z = 500
            // world
            scene = new THREE.Scene()
            scene.background = new THREE.Color(0xcccccc)
            scene.fog = new THREE.FogExp2(0xcccccc, 0.002)
            const geometry = new THREE.CylinderGeometry(0, 10, 30, 4, 1)
            const material = new THREE.MeshPhongMaterial({ color: 0xffffff, flat
            Shading: true })
            for (let i = 0; i < 500; i++) {
               const mesh = new THREE.Mesh(geometry, material)
               mesh.position.x = (Math.random() - 0.5) * 1000
               mesh.position.y = (Math.random() - 0.5) * 1000
               mesh.position.z = (Math.random() - 0.5) * 1000
               mesh.updateMatrix()
               mesh.matrixAutoUpdate = false
               scene.add(mesh)
            }
            // lights
            const dirLight1 = new THREE.DirectionalLight(0xffffff)
            dirLight1.position.set(1, 1, 1)
            scene.add(dirLight1)
            const dirLight2 = new THREE.DirectionalLight(0x002288)
            dirLight2.position.set(-1, -1, -1)
            scene.add(dirLight2)
            const ambientLight = new THREE.AmbientLight(0x222222)
            scene.add(ambientLight)
            // renderer
            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)
            //
            const gui = new dat.GUI()
            gui
            .add(params, 'orthographicCamera')
            .name('use orthographic')
            .onChange(function (value) {
               controls.dispose()
               createControls(value ? orthographicCamera : perspectiveCamera)
            })
            //
            window.addEventListener('resize', onWindowResize)
            createControls(perspectiveCamera)
         }
         function createControls(camera) {
            controls = new TrackballControls(camera, renderer.domElement)
            controls.rotateSpeed = 1.0
            controls.zoomSpeed = 1.2
            controls.panSpeed = 0.8
            controls.keys = ['KeyA', 'KeyS', 'KeyD']
         }
         function onWindowResize() {
            const aspect = window.innerWidth / window.innerHeight
            perspectiveCamera.aspect = aspect
            perspectiveCamera.updateProjectionMatrix()
            orthographicCamera.left = (-frustumSize * aspect) / 2
            orthographicCamera.right = (frustumSize * aspect) / 2
            orthographicCamera.top = frustumSize / 2
            orthographicCamera.bottom = -frustumSize / 2
            orthographicCamera.updateProjectionMatrix()
            renderer.setSize(window.innerWidth, window.innerHeight)
            controls.handleResize()
         }
         function animate() {
            requestAnimationFrame(animate)
            controls.update()
            stats.update()
            render()
         }
         function render() {
            const camera = params.orthographicCamera ? orthographicCamera : pers
            pectiveCamera
            renderer.render(scene, camera)
         }
      </script>
   </body>
</html>

Output

Fly Controls
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