Using tweens.js
Video Lecture
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
Start Code
./src/server/server.ts
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30 | import express from "express"
import path from "path"
import http from "http"
const port: number = 3000
class App {
private server: http.Server
private port: number
constructor(port: number) {
this.port = port
const app = express()
app.use(express.static(path.join(__dirname, '../client')))
app.use('/build/three.module.js', express.static(path.join(__dirname, '../../node_modules/three/build/three.module.js')))
app.use('/jsm/controls/OrbitControls', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/controls/OrbitControls.js')))
app.use('/jsm/loaders/GLTFLoader', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/loaders/GLTFLoader.js')))
app.use('/jsm/libs/stats.module', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/libs/stats.module.js')))
app.use('/jsm/libs/tween.module.min', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/libs/tween.module.min.js')))
this.server = new http.Server(app);
}
public Start() {
this.server.listen(this.port, () => {
console.log( `Server listening on port ${this.port}.` )
})
}
}
new App(port).Start()
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./src/client/client.ts
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115 | import * as THREE from '/build/three.module.js'
import { OrbitControls } from '/jsm/controls/OrbitControls'
import { GLTFLoader } from '/jsm/loaders/GLTFLoader'
import Stats from '/jsm/libs/stats.module'
import { TWEEN } from '/jsm/libs/tween.module.min'
const scene: THREE.Scene = new THREE.Scene()
const axesHelper = new THREE.AxesHelper(5)
scene.add(axesHelper)
const camera: THREE.PerspectiveCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.z = 2
const renderer: THREE.WebGLRenderer = 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.addEventListener('change', render) //this line is unnecessary if you are re-rendering within the animation loop
let sceneMeshes = new Array()
const loader = new GLTFLoader()
loader.load(
'models/monkey_textured.glb',
function (gltf) {
gltf.scene.traverse(function (child) {
if ((<THREE.Mesh>child).isMesh) {
let m = <THREE.Mesh>child
m.receiveShadow = true
m.castShadow = true;
//(<THREE.MeshStandardMaterial>m.material).flatShading = true
sceneMeshes.push(m)
}
if ((<THREE.Light>child).isLight) {
let l = <THREE.Light>child
l.castShadow = true
l.shadow.bias = -.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)
const clock: THREE.Clock = new THREE.Clock()
var animate = function () {
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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87 | 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;
}
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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18 | {
"compilerOptions": {
"target": "ES6",
"module": "ES6",
"outDir": "../../dist/client",
"baseUrl": ".",
"paths": {
"/build/three.module.js": ["../../node_modules/three/src/Three"],
"/jsm/*": ["../../node_modules/three/examples/jsm/*"],
"/jsm/libs/dat.gui.module": ["../typings/dat.gui"],
"/jsm/libs/tween.module.min": ["../typings/tween.js"]
},
"moduleResolution": "node"
},
"include": [
"**/*.ts"
]
}
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Final Script
./src/client/client.ts
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146 | import * as THREE from '/build/three.module.js'
import { OrbitControls } from '/jsm/controls/OrbitControls'
import { GLTFLoader } from '/jsm/loaders/GLTFLoader'
import Stats from '/jsm/libs/stats.module'
import { TWEEN } from '/jsm/libs/tween.module.min'
const scene: THREE.Scene = new THREE.Scene()
const axesHelper = new THREE.AxesHelper(5)
scene.add(axesHelper)
const camera: THREE.PerspectiveCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.z = 2
const renderer: THREE.WebGLRenderer = 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.addEventListener('change', render) //this line is unnecessary if you are re-rendering within the animation loop
let sceneMeshes = new Array()
const loader = new GLTFLoader()
loader.load(
'models/monkey_textured.glb',
function (gltf) {
gltf.scene.traverse(function (child) {
if ((<THREE.Mesh>child).isMesh) {
let m = <THREE.Mesh>child
m.receiveShadow = true
m.castShadow = true;
//(<THREE.MeshStandardMaterial>m.material).flatShading = true
sceneMeshes.push(m)
}
if ((<THREE.Light>child).isLight) {
let l = <THREE.Light>child
l.castShadow = true
l.shadow.bias = -.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.Bounce.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)
const clock: THREE.Clock = new THREE.Clock()
var animate = function () {
requestAnimationFrame(animate)
controls.update()
TWEEN.update();
render()
stats.update()
};
function render() {
renderer.render(scene, camera)
}
animate();
|
Useful Links
tween.js GitHub
