THREE.Interactive

Fast and simple interaction manager for THREE.js for enabling pointer, mouse and touch events on 3D objects.

Note: When using ReactJS I can highly recommend react-three-fiber, which has built-in interaction support. For pure THREE.js projects, this little library can be very useful though.

ESM only. Currently no CJS version is built.

Hot it works:

• Interactive Objects (THREE.Object3D) are added to the InteractionManager, which fires instances of InteractiveEvent.

• Differenciates between mouseover/mouseout (closest objects) and mouseenter/mouseleave (all objects) events.

• Intersections are sorted by distance to the camera and the events are dispatched in that order (closest first). If InteractiveEvent.stopPropagation() is called, the event won't fire again on other objects.

Alternative to three.interaction.

Collaborations and improvements are welcome.

Examples

• Simple: Basic example
• Auto Add: Auto-add example, still beta
• Depth: Overlapping objects example
• glTF: Hover/click gltf objects example

Usage

yarn add three.interactive

or

npm install three.interactive

1. Include script:

import { InteractionManager } from 'three.interactive';

2. Create an InteractionManager instance

const interactionManager = new InteractionManager(
  renderer,
  camera,
  renderer.domElement
);

3. Add object to InteractionManager

interactionManager.add(cube);

4. Add event listener to object

cube.addEventListener('click', (event) => {});

5. Call InteractionManager.update() on each render

interactionManager.update();

Simple example

import * as THREE from 'three';
import { InteractionManager } from 'three.interactive';

const container = document.createElement('div');
container.setAttribute('id', 'container');
document.body.appendChild(container);

const renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container.appendChild(renderer.domElement);

const scene = new THREE.Scene();

const camera = new THREE.PerspectiveCamera(
  45,
  window.innerWidth / window.innerHeight,
  0.1,
  1000
);
camera.position.set(0.0, 0.0, 10.0);

const interactionManager = new InteractionManager(
  renderer,
  camera,
  renderer.domElement
);

const geometry = new THREE.BoxGeometry(1, 1, 1);
const material = new THREE.MeshBasicMaterial();

const cube = new THREE.Mesh(geometry, material);
cube.addEventListener('mouseover', (event) => {
  event.target.material.color.set(0xff0000);
  document.body.style.cursor = 'pointer';
});
cube.addEventListener('mouseout', (event) => {
  event.target.material.color.set(0xffffff);
  document.body.style.cursor = 'default';
});
cube.addEventListener('mousedown', (event) => {
  event.target.scale.set(1.1, 1.1, 1.1);
});
cube.addEventListener('click', (event) => {
  event.target.scale.set(1.0, 1.0, 1.0);
});
scene.add(cube);
interactionManager.add(cube);

const animate = (time) => {
  requestAnimationFrame(animate);

  interactionManager.update();

  renderer.render(scene, camera);
};

animate();

API

InteractionManager class

new InteractionManager(renderer, camera, renderer.domElement [, { autoAdd: false, scene, bindEventsOnBodyElement: true } ]) – constructor InteractionManager instance; if the autoAdd option (still beta) is used, there is no need for adding objects to InteractionManager manually and calling interactionManager.update(); In this mode, the scene needs to be provided in the options.

Members:

treatTouchEventsAsMouseEvents (boolean) – wether touch events should fire as mouse events, default: true

Methods:

interactionManager.add(object, childNames = []) – add object(s), optionally select only children of object by their names

interactionManager.remove(object, childNames = []) – remove object(s), optionally select only children of object by their names

interactionManager.update() – update InteractionManager on each render

interactionManager.dispose() – dispose InteractionManager

InteractionManagerOptions class

new InteractionManagerOptions({ autoAdd: false, scene, bindEventsOnBodyElement: true }) – constructor InteractionManagerOptions instance

InteractiveEvent class

Members:

cancelBubble (boolean) – wether events should continue to bubble, default: false

coords (THREE.Vector2) – Mouse/touch coords

distance (number) – Distance of intersected point from camera

intersected (boolean) – Whether object is still intersected

originalEvent (Event object) – Original event, if available (MouseEvent, TouchEvent or PointerEvent)

target (THREE.Object3D) – Target object

type (string) – event type: 'click', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave', 'mousedown', 'mousemove', 'mouseup', 'touchstart', 'touchmove', 'touchend', 'pointerdown', 'pointerup', 'pointermove'

Methods:

stopPropagation – stop bubbling of event (cancelBubble), e.g. when only the object closest to the camera is supposed to fire an event

Editing source

In order to edit the source code, run:

yarn start

And open http://127.0.0.1:8000/ in your browers.

The files in the build folder will automatically be rebuilt when the files in the src folder are modified.

License

MIT licensed

Created by Markus Lerner & contributors