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GLTF Animations

Video Lecture

GLTF Animations GLTF Animations

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.

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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

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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

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