Skip to content


 Zabbix
 Grafana
 Prometheus
 React Three Fiber
 Threejs and TypeScript
 SocketIO and TypeScript
 Blender Topological Earth
 Sweet Home 3D
 Design Patterns Python
 Design Patterns TypeScript
   
 Course Coupon Codes
Three.js and TypeScript
Kindle Edition
$6.99 $9.99 Paperback 
$22.99 $29.99




Design Patterns in TypeScript
Kindle Edition
$6.99 $9.99 Paperback
$11.99 $19.99




Design Patterns in Python
Kindle Edition
$6.99 $9.99 Paperback
$11.99 $19.99




Infinity Roller

Description

Rotating an object by quaternion. See the line sphere.applyQuaternion(q) below.

For some more sophisticated ball rolling examples see,

Example Script

./src/client/client.ts

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
import * as THREE from 'three'
import Stats from 'three/examples/jsm/libs/stats.module'

const scene = new THREE.Scene()

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.set(0, 2.5, 2.5)

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const gridHelper = new THREE.GridHelper(100, 100)
scene.add(gridHelper)

const material = new THREE.MeshNormalMaterial({ wireframe: true })

const sphere = new THREE.Mesh(new THREE.SphereGeometry(), material)
sphere.position.y = 1
scene.add(sphere)

sphere.add(new THREE.AxesHelper(2))

camera.lookAt(sphere.position)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

const keyMap: { [id: string]: boolean } = {}
const onDocumentKey = (e: KeyboardEvent) => {
    keyMap[e.code] = e.type === 'keydown'
}
document.addEventListener('keydown', onDocumentKey, false)
document.addEventListener('keyup', onDocumentKey, false)

const stats = Stats()
document.body.appendChild(stats.dom)

const v0 = new THREE.Vector3()
const q = new THREE.Quaternion()
const angularVelocity = new THREE.Vector3()

const clock = new THREE.Clock()
let delta = 0

function animate() {
    requestAnimationFrame(animate)

    delta = clock.getDelta()

    if (keyMap['KeyW']) {
        angularVelocity.x -= delta * 5
    }
    if (keyMap['KeyS']) {
        angularVelocity.x += delta * 5
    }
    if (keyMap['KeyA']) {
        angularVelocity.z += delta * 5
    }
    if (keyMap['KeyD']) {
        angularVelocity.z -= delta * 5
    }

    q.setFromAxisAngle(angularVelocity, delta).normalize()
    sphere.applyQuaternion(q)

    angularVelocity.lerp(v0, 0.01) // slow down the roll

    gridHelper.position.x += angularVelocity.z * delta
    gridHelper.position.z -= angularVelocity.x * delta

    gridHelper.position.x = gridHelper.position.x % 10
    gridHelper.position.z = gridHelper.position.z % 10

    render()

    stats.update()
}

function render() {
    renderer.render(scene, camera)
}

animate()