DragControls with GLTF Animations
GLTF models exported with animations, often don't work with the DragControls, so one approach to solve the problem, is to create a secondary object, such as a cube, and bind the DragControls to that instead. Then adjust the position of your model group to the new position of the cube being dragged.
In this example, you can drag the animated GLTF model using the DragControls.
Resources
For this example, I have downloaded the Eve By J.Gonzales model with the Punching animation included. In Mixamo, I've selected the Eve character, then selected the animation tab and selected the Punching animation. I then downloaded using the FBX Binary(.fbx) and With Skin options. I've then imported the downloaded FBX into Blender and exported it as a GLB as described in previous lessons. I saved the model to my ./dist/client/models/ folder and named it as eve@punching.glb. You can choose a different model and animation if you prefer. Ensure to match the file name you saved with the file name that you load in the source code. Note that models created by different people were created for different purposes, so you may need to adjust some properties of the models either in Blender or traverse them after they are loaded as I have demonstrated in the previous videos.
or you can direct download eve@punching.glb and save into ./dist/client/models
Lesson 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
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151 | 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 { DragControls } from 'three/examples/jsm/controls/DragControls'
const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))
const light1 = new THREE.PointLight()
light1.position.set(2.5, 2.5, 2.5)
light1.castShadow = true
scene.add(light1)
const light2 = new THREE.PointLight()
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 sceneMeshes: THREE.Mesh[] = []
let boxHelper: THREE.BoxHelper
const dragControls = new DragControls(sceneMeshes, camera, renderer.domElement)
dragControls.addEventListener('hoveron', function () {
boxHelper.visible = true
orbitControls.enabled = false
})
dragControls.addEventListener('hoveroff', function () {
boxHelper.visible = false
orbitControls.enabled = true
})
dragControls.addEventListener('drag', function (event) {
event.object.position.y = 0
})
dragControls.addEventListener('dragstart', function () {
boxHelper.visible = true
orbitControls.enabled = false
})
dragControls.addEventListener('dragend', function () {
boxHelper.visible = false
orbitControls.enabled = true
})
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()
let modelGroup: THREE.Group
let modelDragBox: THREE.Mesh
gltfLoader.load(
'models/eve@punching.glb',
(gltf) => {
gltf.scene.traverse(function (child) {
if (child instanceof THREE.Group) {
modelGroup = 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()
modelDragBox = new THREE.Mesh(
new THREE.BoxGeometry(0.5, 1.3, 0.5),
new THREE.MeshBasicMaterial({ transparent: true, opacity: 0 })
)
modelDragBox.geometry.translate(0, 0.65, 0)
scene.add(modelDragBox)
sceneMeshes.push(modelDragBox)
boxHelper = new THREE.BoxHelper(modelDragBox, 0xffff00)
boxHelper.visible = false
scene.add(boxHelper)
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())
modelGroup.position.copy(modelDragBox.position)
boxHelper.update()
}
render()
stats.update()
}
function render() {
renderer.render(scene, camera)
}
animate()
|
Paperback 
