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FBX Animations

Video Lecture

FBX Animations

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

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