Skip to content

TransformControls with GLTF Animations

Here is an example of an animated GLTF being manipulated with transform controls.

In this example, you can transform the animated models position, rotation and size.

<>

Scripts

./src/client/client.ts

Note

For this example, I have downloaded the EVE model with the punching animation from Mixamo. I've then imported the FBX into Blender and exported it as a GLB as described in previous lessons. You can choose a different model and animation if you prefer. Ensure to correct the file name in the source code to match your exported models filename. Also models created by different people were created for different purposes, so you may need to adjust some properties of the model as you load them, as I have demonstrated in previous lessons.

  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
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { TransformControls } from 'three/examples/jsm/controls/TransformControls'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const light1 = new THREE.PointLight(0xffffff, 100)
light1.position.set(2.5, 2.5, 2.5)
light1.castShadow = true
scene.add(light1)

const light2 = new THREE.PointLight(0xffffff, 100)
light2.position.set(-2.5, 2.5, 2.5)
light2.castShadow = true
scene.add(light2)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.01,
    1000
)
camera.position.set(0.8, 1.4, 1.0)

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

const orbitControls = new OrbitControls(camera, renderer.domElement)
orbitControls.enableDamping = true
orbitControls.target.set(0, 1, 0)

const transformControls = new TransformControls(camera, renderer.domElement)
scene.add(transformControls)
transformControls.addEventListener('mouseDown', function () {
    orbitControls.enabled = false
})
transformControls.addEventListener('mouseUp', function () {
    orbitControls.enabled = true
})

window.addEventListener('keydown', function (event: KeyboardEvent) {
    switch (event.key) {
        case 'g':
            transformControls.setMode('translate')
            break
        case 'r':
            transformControls.setMode('rotate')
            break
        case 's':
            transformControls.setMode('scale')
            break
    }
})

const planeGeometry = new THREE.PlaneGeometry(25, 25)
const texture = new THREE.TextureLoader().load('img/grid.png')
const plane: THREE.Mesh = new THREE.Mesh(
    planeGeometry,
    new THREE.MeshPhongMaterial({ map: texture })
)
plane.rotateX(-Math.PI / 2)
plane.receiveShadow = true
scene.add(plane)

let mixer: THREE.AnimationMixer
let modelReady = false
const gltfLoader: GLTFLoader = new GLTFLoader()

gltfLoader.load(
    'models/eve@punching.glb',
    (gltf) => {
        gltf.scene.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                child.castShadow = true
                child.frustumCulled = false
                ;(child as THREE.Mesh).geometry.computeVertexNormals()
            }
        })

        mixer = new THREE.AnimationMixer(gltf.scene)
        mixer.clipAction((gltf as any).animations[0]).play()

        transformControls.attach(gltf.scene)

        scene.add(gltf.scene)

        modelReady = true
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
    },
    (error) => {
        console.log(error)
    }
)

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

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

const clock = new THREE.Clock()

function animate() {
    requestAnimationFrame(animate)

    orbitControls.update()

    if (modelReady) {
        mixer.update(clock.getDelta())
    }

    render()

    stats.update()
}

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

animate()

Comments