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Three.js and TypeScript
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Design Patterns in TypeScript
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Design Patterns in Python
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Using tweens.js

Video Lecture

Using tweens.js Using tweens.js Using tweens.js

Description

Tweenjs is a JavaScript tweening engine.

A tween (from in-between) is a concept that allows you to change the values of the properties of an object in a smooth way. We can decide how long it should take, and if there should be a delay, and what to do each time the tween is updated, whether it should repeat and other things.

Tween Easing Options

TWEEN.Easing.equation.direction

TWEEN.Easing.*equation*.*direction*

Start Scripts

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { TWEEN } from 'three/examples/jsm/libs/tween.module.min'

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

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 2

const renderer = new THREE.WebGLRenderer()
renderer.physicallyCorrectLights = true
renderer.shadowMap.enabled = true
renderer.outputEncoding = THREE.sRGBEncoding
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

const sceneMeshes: THREE.Mesh[] = []

const loader = new GLTFLoader()
loader.load(
    'models/monkey_textured.glb',
    function (gltf) {
        gltf.scene.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                const m = child as THREE.Mesh
                m.receiveShadow = true
                m.castShadow = true
                //(m.material as THREE.MeshStandardMaterial).flatShading = true
                sceneMeshes.push(m)
            }
            if ((child as THREE.Light).isLight) {
                const l = child as THREE.Light
                l.castShadow = true
                l.shadow.bias = -0.003
                l.shadow.mapSize.width = 2048
                l.shadow.mapSize.height = 2048
            }
        })
        scene.add(gltf.scene)
    },
    (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 raycaster = new THREE.Raycaster()

renderer.domElement.addEventListener('dblclick', onDoubleClick, false)
function onDoubleClick(event: MouseEvent) {
    const mouse = {
        x: (event.clientX / renderer.domElement.clientWidth) * 2 - 1,
        y: -(event.clientY / renderer.domElement.clientHeight) * 2 + 1,
    }
    raycaster.setFromCamera(mouse, camera)

    const intersects = raycaster.intersectObjects(sceneMeshes, false)

    if (intersects.length > 0) {
        // const p = intersects[0].point
        // controls.target.set(p.x, p.y, p.z)
        // new TWEEN.Tween(controls.target)
        //     .to({
        //         x: p.x,
        //         y: p.y,
        //         z: p.z
        //     }, 500)
        //     //.delay (1000)
        //     .easing(TWEEN.Easing.Cubic.Out)
        //     //.onUpdate(() => render())
        //     .start()
    }
}

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

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    TWEEN.update()

    render()

    stats.update()
}

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

animate()

./src/typings/tween.js/index.d.ts

Create a new folder called ./src/typings/tween.js/ and add the TypeScript definition file for tween.js and name it index.d.ts

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export class tween {
    Tween: typeof Tween
    update(time?: number): boolean
    getAll(): Tween[]
    removeAll(): void
    add(tween: Tween): void
    remove(tween: Tween): void
    Easing: {
        Linear: {
            None: (amount: number) => number
        }
        Quadratic: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Cubic: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Quartic: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Quintic: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Sinusoidal: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Exponential: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Circular: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Elastic: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Back: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
        Bounce: {
            In: (amount: number) => number
            Out: (amount: number) => number
            InOut: (amount: number) => number
        }
    }
}
declare type EasingFunction = (amount: number) => number
declare class Tween {
    constructor(object: any)
    isPlaying(): boolean
    isPaused(): boolean
    to(properties: {}, duration?: number): this
    duration(value: number): this
    start(time?: number | string): this
    stop(): this
    end(): this
    pause(time: number): this
    resume(time: number): this
    delay(amount: number): this
    repeat(times: number): this
    repeatDelay(amount: number): this
    onStart(callback: (object: any) => void): this
    onUpdate(callback: (object: any, elapsed: number) => void): this
    onRepeat(callback: (object: any) => void): this
    onComplete(callback: (object: any) => void): this
    onStop(callback: (object: any) => void): this
    easing(easing: EasingFunction): this
    chain(tween: Tween): this
}

declare const TWEEN: tween

./src/client/tsconfig.json

Update the compiler options paths to point to the new tween.js typescript definition file.

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{
    "compilerOptions": {
        "moduleResolution": "node",
        "strict": true,
        "paths": {
            "three/examples/jsm/libs/tween.module.min": ["../typings/tween.js"]
        }
    },
    "include": ["**/*.ts"]
}

Final Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { TWEEN } from 'three/examples/jsm/libs/tween.module.min'

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

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 2

const renderer = new THREE.WebGLRenderer()
renderer.physicallyCorrectLights = true
renderer.shadowMap.enabled = true
renderer.outputEncoding = THREE.sRGBEncoding
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

const sceneMeshes: THREE.Mesh[] = []

const loader = new GLTFLoader()
loader.load(
    'models/monkey_textured.glb',
    function (gltf) {
        gltf.scene.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                const m = child as THREE.Mesh
                m.receiveShadow = true
                m.castShadow = true
                //(m.material as THREE.MeshStandardMaterial).flatShading = true
                sceneMeshes.push(m)
            }
            if ((child as THREE.Light).isLight) {
                const l = child as THREE.Light
                l.castShadow = true
                l.shadow.bias = -0.003
                l.shadow.mapSize.width = 2048
                l.shadow.mapSize.height = 2048
            }
        })
        scene.add(gltf.scene)
    },
    (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 raycaster = new THREE.Raycaster()

renderer.domElement.addEventListener('dblclick', onDoubleClick, false)
function onDoubleClick(event: MouseEvent) {
    const mouse = {
        x: (event.clientX / renderer.domElement.clientWidth) * 2 - 1,
        y: -(event.clientY / renderer.domElement.clientHeight) * 2 + 1,
    }
    raycaster.setFromCamera(mouse, camera)

    const intersects = raycaster.intersectObjects(sceneMeshes, false)

    if (intersects.length > 0) {
        const p = intersects[0].point

        //controls.target.set(p.x, p.y, p.z)

        // new TWEEN.Tween(controls.target)
        //     .to({
        //         x: p.x,
        //         y: p.y,
        //         z: p.z
        //     }, 500)
        //     //.delay (1000)
        //     .easing(TWEEN.Easing.Cubic.Out)
        //     //.onUpdate(() => render())
        //     .start()

        new TWEEN.Tween(sceneMeshes[1].position)
            .to(
                {
                    x: p.x,
                    // y: p.y + 1,
                    z: p.z,
                },
                500
            )
            .start()

        new TWEEN.Tween(sceneMeshes[1].position)
            .to(
                {
                    // x: p.x,
                    y: p.y + 3,
                    // z: p.z,
                },
                250
            )
            //.delay (1000)
            .easing(TWEEN.Easing.Cubic.Out)
            //.onUpdate(() => render())
            .start()
            .onComplete(() => {
                new TWEEN.Tween(sceneMeshes[1].position)
                    .to(
                        {
                            // x: p.x,
                            y: p.y + 1,
                            // z: p.z,
                        },
                        250
                    )
                    //.delay (250)
                    .easing(TWEEN.Easing.Bounce.Out)
                    //.onUpdate(() => render())
                    .start()
            })
    }
}

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

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    TWEEN.update()

    render()

    stats.update()
}

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

animate()

tween.js GitHub