Skip to content

GLTF Animations

Video Lecture

GLTF Animations GLTF Animations

 (Pay Per View)

You can use PayPal to purchase a one time viewing of this video for $1.49 USD.

Pay Per View Terms

  • One viewing session of this video will cost the equivalent of $1.49 USD in your currency.
  • After successful purchase, the video will automatically start playing.
  • You can pause, replay and go fullscreen as many times as needed in one single session for up to an hour.
  • Do not refresh the browser since it will invalidate the session.
  • If you want longer-term access to all videos, consider purchasing full access through Udemy or YouTube Memberships instead.
  • This Pay Per View option does not permit downloading this video for later viewing or sharing.
  • All videos are Copyright © 2019-2025 Sean Bradley, all rights reserved.

Description

In this lesson, we will use GLTF animations both stored in the GLTF and external.

We will use Blender to convert FBX models and animations from Mixamo, into GLB files.

<>

Resources

The 3D model and animations used in this lesson can easily be downloaded from Mixamo and converted using Blender. If you don't want to download and convert, then you can download the converted files using the link below. Extract the contents of the zip file into your ./public/models/ folder.

gltf-animations.zip

Lesson Script

./src/main.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
import './style.css'
import * as THREE from 'three'
import { OrbitControls } from 'three/addons/controls/OrbitControls.js'
import { RGBELoader } from 'three/addons/loaders/RGBELoader.js'
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js'
import Stats from 'three/addons/libs/stats.module.js'

const scene = new THREE.Scene()

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

new RGBELoader().load('img/venice_sunset_1k.hdr', (texture) => {
  texture.mapping = THREE.EquirectangularReflectionMapping
  scene.environment = texture
  scene.background = texture
  scene.backgroundBlurriness = 1
})

const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 100)
camera.position.set(0.1, 1, 1)

const renderer = new THREE.WebGLRenderer({ antialias: true })
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

window.addEventListener('resize', () => {
  camera.aspect = window.innerWidth / window.innerHeight
  camera.updateProjectionMatrix()
  renderer.setSize(window.innerWidth, window.innerHeight)
})

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true
controls.target.set(0, 0.75, 0)

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

// function lerp(from: number, to: number, speed: number) {
//   const amount = (1 - speed) * from + speed * to
//   return Math.abs(from - to) < 0.001 ? to : amount
// }

//let mixer: THREE.AnimationMixer
//let animationActions: { [key: string]: THREE.AnimationAction } = {}
//let activeAction: THREE.AnimationAction
// let speed = 0,
//   toSpeed = 0

new GLTFLoader().load('models/eve$@walk.glb', (gltf) => {
  //   mixer = new THREE.AnimationMixer(gltf.scene)
  //   //console.log(gltf  )

  //   mixer.clipAction(gltf.animations[0]).play()

  scene.add(gltf.scene)
})

// async function loadEve() {
//   const loader = new GLTFLoader()
//   const [eve, idle, run] = await Promise.all([
//     loader.loadAsync('models/eve$@walk.glb'),
//     loader.loadAsync('models/eve@idle.glb'),
//     loader.loadAsync('models/eve@run.glb')
//   ])

//   mixer = new THREE.AnimationMixer(eve.scene)

//   // mixer.clipAction(idle.animations[0]).play()

//   // animationActions['idle'] = mixer.clipAction(idle.animations[0])
//   // animationActions['walk'] = mixer.clipAction(eve.animations[0])
//   // animationActions['run'] = mixer.clipAction(run.animations[0])

//   // animationActions['idle'].play()
//   // activeAction = animationActions['idle']

//   scene.add(eve.scene)
// }
// await loadEve()

// const keyMap: { [key: string]: boolean } = {}

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

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

function animate() {
  requestAnimationFrame(animate)

  //delta = clock.getDelta()

  controls.update()

  //mixer.update(delta)

  // if (keyMap['KeyW']) {
  //   if (keyMap['ShiftLeft']) {
  //     //run
  //     if (activeAction != animationActions['run']) {
  //       activeAction.fadeOut(0.5)
  //       animationActions['run'].reset().fadeIn(0.25).play()
  //       activeAction = animationActions['run']
  //       // toSpeed = 4
  //     }
  //   } else {
  //     //walk
  //     if (activeAction != animationActions['walk']) {
  //       activeAction.fadeOut(0.5)
  //       animationActions['walk'].reset().fadeIn(0.25).play()
  //       activeAction = animationActions['walk']
  //       // toSpeed = 1
  //     }
  //   }
  // } else {
  //   //idle
  //   if (activeAction != animationActions['idle']) {
  //     activeAction.fadeOut(0.5)
  //     animationActions['idle'].reset().fadeIn(0.25).play()
  //     activeAction = animationActions['idle']
  //     // toSpeed = 0
  //   }
  // }

  // speed = lerp(speed, toSpeed, delta * 10)
  // gridHelper.position.z -= speed * delta
  // gridHelper.position.z = gridHelper.position.z % 10

  renderer.render(scene, camera)

  stats.update()
}

animate()

Blender

Mixamo

https://threejs.org/docs/#api/en/animation/AnimationMixer

https://threejs.org/docs/#api/en/animation/KeyframeTrack