Three Tween Path

This module uses TweenJs to create a smooth path (Catmull-Rom) through the given path data (includes vertices, duration and delay between segments).

Install using npm:

npm i three-tween-path

Usage

Import the module and your path data

import * as THREE from "three";
import TWEEN from "@tweenjs/tween.js";
import * as TweenRoute from "three-tween-path";
import { samplePath } from './samplePath';

Create a MultiTween with a given 3d object and the path data

let myTween = TweenRoute.MultiTweenPath(my3dObject, samplePath);
myTween.start();

Run the TweenJs update function to keep your tween updated

const animate = () => {
  requestAnimationFrame(animate);
  renderer.render(scene, camera);
  //update tween
  TWEEN.update();
};

Callbacks

Use callbacks according to the implementation in tweenjs. A callback can be implemented like this:

const onSegmentStart = () => {
  //could be used to start a running animation or something similar
  console.log("Segment start!");
}
const onSegmentEnd = () => {
  //could stop the running animation and return to an idle animation
  console.log("Segment end!");
}
let sampleTween = TweenRoute.MultiTweenPath(cone, samplePath, onSegmentStart, onSegmentEnd);
sampleTween.start();

One callback is run at the beginning of the segment and the other at the end of a segment. Use this to halt any animations or run different kind of tasks.

Path Data

The path data necessary for the module is in the following structure:

const pathData = [
    {
        path: [
            {x: -40, y: 30, z: -17},
            {x: -43, y: 29, z: -16},
            {x: -42, y: 29, z: -15} //copy to next path for consistency
        ],
        delay: 2000,
        duration: 5000
    },
    {
        path: [
            {x: -42, y: 29, z: -15}, //be sure to include the last vector of the previous path
            {x: -41, y: 29.25, z: -15},
            {x: -18, y: 28, z: -3}
        ],
        delay: 2000,
        duration: 10000
    },
    {
        path: [
            {x: -18, y: 28, z: -3},
            {x: -16.5, y: 28, z: -5},
            {x: -6, y: 28, z: -6}
        ],
        delay: 1000,
        duration: 8000
    }
]

Always include the last vertices of the previous path in the subsequent path to avoid choppy transitions.
The duration and delay parameters are measured in milliseconds.

Example

Clone the repository and run

npm i
npm start

The example is available under localhost:3000