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FBX Animations

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FBX Animations

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Description

In this exercise, we import a different FBX model, and we also import several animation clips for the model. We then create buttons to smoothly transition the model between each animation clip.

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Resources

For this exercise, you should download the character model named "Vanguard By T. Choonyung" from Mixamo and save it into your ./dist/client/models/ folder. Save it as vanguard_t_choonyung.fbx using the options FBX Binary(.fbx) and T-Pose.

Also download the animations separately, save them into your ./dist/client/models/ folder using the options FBX Binary(.fbx) and Without Skin. Rename them as below.

  • Samba Dancing (In Place Version) --> Rename to vanguard@samba.fbx
  • Belly Dancing --> Rename to vanguard@bellydance.fbx
  • Goofy Running --> Rename to vanguard@goofyrunning.fbx

or direct download and save all models into ./dist/client/models

Start Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { FBXLoader } from 'three/examples/jsm/loaders/FBXLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'

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

const light = new THREE.PointLight(0xffffff, 1000)
light.position.set(2.5, 7.5, 15)
scene.add(light)

const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.set(0.8, 1.4, 1.0)

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

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

let mixer: THREE.AnimationMixer
let modelReady = false
const animationActions: THREE.AnimationAction[] = []
let activeAction: THREE.AnimationAction
let lastAction: THREE.AnimationAction
const fbxLoader: FBXLoader = new FBXLoader()

fbxLoader.load(
  'models/vanguard_t_choonyung.fbx',
  (object) => {
    object.scale.set(0.01, 0.01, 0.01)
    mixer = new THREE.AnimationMixer(object)

    const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0])
    animationActions.push(animationAction)
    animationsFolder.add(animations, 'default')
    activeAction = animationActions[0]

    scene.add(object)

    // // add an animation from another file
    // fbxLoader.load('models/vanguard@samba.fbx',
    //     (object) => {
    //         console.log("loaded samba")

    //         const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0]);
    //         animationActions.push(animationAction)
    //         animationsFolder.add(animations, "samba")

    //         // add an animation from another file
    //         fbxLoader.load('models/vanguard@bellydance.fbx',
    //             (object) => {
    //                 console.log("loaded bellydance")
    //                 const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0]);
    //                 animationActions.push(animationAction)
    //                 animationsFolder.add(animations, "bellydance")

    //                 // add an animation from another file
    //                 fbxLoader.load('models/vanguard@goofyrunning.fbx',
    //                     (object) => {
    //                         console.log("loaded goofyrunning");
    //                         (object as THREE.Object3D).animations[0].tracks.shift() //delete the specific track that moves the object forward while running
    //                         //console.dir((object as THREE.Object3D).animations[0])
    //                         const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0]);
    //                         animationActions.push(animationAction)
    //                         animationsFolder.add(animations, "goofyrunning")

    //                         modelReady = true
    //                     },
    //                     (xhr) => {
    //                         console.log((xhr.loaded / xhr.total * 100) + '% loaded')
    //                     },
    //                     (error) => {
    //                         console.log(error)
    //                     }
    //                 )
    //             },
    //             (xhr) => {
    //                 console.log((xhr.loaded / xhr.total * 100) + '% loaded')
    //             },
    //             (error) => {
    //                 console.log(error)
    //             }
    //         )
    //     },
    //     (xhr) => {
    //         console.log((xhr.loaded / xhr.total * 100) + '% loaded')
    //     },
    //     (error) => {
    //         console.log(error)
    //     }
    // )
  },
  (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 animations = {
  default: function () {
    setAction(animationActions[0])
  },
  samba: function () {
    setAction(animationActions[1])
  },
  bellydance: function () {
    setAction(animationActions[2])
  },
  goofyrunning: function () {
    setAction(animationActions[3])
  },
}

const setAction = (toAction: THREE.AnimationAction) => {
  if (toAction != activeAction) {
    lastAction = activeAction
    activeAction = toAction
    lastAction.stop()
    //lastAction.fadeOut(1)
    activeAction.reset()
    //activeAction.fadeIn(1)
    activeAction.play()
  }
}

const gui = new GUI()
const animationsFolder = gui.addFolder('Animations')
animationsFolder.open()

const clock = new THREE.Clock()

function animate() {
  requestAnimationFrame(animate)

  controls.update()

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

  render()

  stats.update()
}

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

animate()

Final Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { FBXLoader } from 'three/examples/jsm/loaders/FBXLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'

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

const light = new THREE.PointLight(0xffffff, 1000)
light.position.set(2.5, 7.5, 15)
scene.add(light)

const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.set(0.8, 1.4, 1.0)

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

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

let mixer: THREE.AnimationMixer
let modelReady = false
const animationActions: THREE.AnimationAction[] = []
let activeAction: THREE.AnimationAction
let lastAction: THREE.AnimationAction
const fbxLoader: FBXLoader = new FBXLoader()

fbxLoader.load(
  'models/vanguard_t_choonyung.fbx',
  (object) => {
    object.scale.set(0.01, 0.01, 0.01)
    mixer = new THREE.AnimationMixer(object)

    const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0])
    animationActions.push(animationAction)
    animationsFolder.add(animations, 'default')
    activeAction = animationActions[0]

    scene.add(object)

    //add an animation from another file
    fbxLoader.load(
      'models/vanguard@samba.fbx',
      (object) => {
        console.log('loaded samba')

        const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0])
        animationActions.push(animationAction)
        animationsFolder.add(animations, 'samba')

        //add an animation from another file
        fbxLoader.load(
          'models/vanguard@bellydance.fbx',
          (object) => {
            console.log('loaded bellydance')
            const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0])
            animationActions.push(animationAction)
            animationsFolder.add(animations, 'bellydance')

            //add an animation from another file
            fbxLoader.load(
              'models/vanguard@goofyrunning.fbx',
              (object) => {
                console.log('loaded goofyrunning')
                ;(object as THREE.Object3D).animations[0].tracks.shift() //delete the specific track that moves the object forward while running
                //console.dir((object as THREE.Object3D).animations[0])
                const animationAction = mixer.clipAction((object as THREE.Object3D).animations[0])
                animationActions.push(animationAction)
                animationsFolder.add(animations, 'goofyrunning')

                modelReady = true
              },
              (xhr) => {
                console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
              },
              (error) => {
                console.log(error)
              }
            )
          },
          (xhr) => {
            console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
          },
          (error) => {
            console.log(error)
          }
        )
      },
      (xhr) => {
        console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
      },
      (error) => {
        console.log(error)
      }
    )
  },
  (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 animations = {
  default: function () {
    setAction(animationActions[0])
  },
  samba: function () {
    setAction(animationActions[1])
  },
  bellydance: function () {
    setAction(animationActions[2])
  },
  goofyrunning: function () {
    setAction(animationActions[3])
  },
}

const setAction = (toAction: THREE.AnimationAction) => {
  if (toAction != activeAction) {
    lastAction = activeAction
    activeAction = toAction
    //lastAction.stop()
    lastAction.fadeOut(1)
    activeAction.reset()
    activeAction.fadeIn(1)
    activeAction.play()
  }
}

const gui = new GUI()
const animationsFolder = gui.addFolder('Animations')
animationsFolder.open()

const clock = new THREE.Clock()

function animate() {
  requestAnimationFrame(animate)

  controls.update()

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

  render()

  stats.update()
}

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

animate()

Mixamo

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

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