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FBX Animations

Video Lecture

FBX Animations 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.

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