three-interact

A declarative library for managing Three.js object interactions with a simple method-chaining API.

Installation

npm install three-interact
# or
yarn add three-interact
# or
pnpm add three-interact

Features

• Simple, declarative API with method chaining
• Event handling for pointer, click, and drag interactions
• Easy integration with existing Three.js projects
• Lightweight with minimal dependencies
• TypeScript support

Requirements

• Three.js (>=0.130.0)

Basic Usage

import * as THREE from 'three'
import { InteractManager, interact } from 'three-interact'

// Create a basic Three.js setup
const renderer = new THREE.WebGLRenderer()
const camera = new THREE.PerspectiveCamera()
const scene = new THREE.Scene()

// Initialize the interaction manager
const manager = new InteractManager(renderer, camera)

// Create an object
const cube = new THREE.Mesh(
  new THREE.BoxGeometry(),
  new THREE.MeshBasicMaterial({ color: 0x3080ff })
)
scene.add(cube)

// Add interaction with method chaining
interact(cube, manager)
  .onPointerEnter(() => {
    cube.material.color.set(0xff0000)
    document.body.style.cursor = 'pointer'
  })
  .onPointerLeave(() => {
    cube.material.color.set(0x3080ff)
    document.body.style.cursor = 'default'
  })
  .onPointerMove((e) => {
    console.log('Pointer moving over cube', e.delta)
  })
  .onClick(() => {
    console.log('Cube clicked')
  })
  .onDrag((e) => {
    // Access e.delta.x and e.delta.y for drag movement amount
    cube.position.x += e.delta.x * 0.01
    cube.position.y -= e.delta.y * 0.01
  })

// Don't forget to update the manager in your animation loop
function animate() {
  requestAnimationFrame(animate)
  manager.update()
  renderer.render(scene, camera)
}
animate()

API Reference

InteractManager

The main controller for handling interactions.

const manager = new InteractManager(renderer, camera);

interact(object, manager)

Factory function that creates an Interactable instance for a Three.js object.

const interactable = interact(myObject, manager);

interactGroup(objects, manager)

Factory function for creating multiple Interactable instances.

const interactables = interactGroup([object1, object2], manager);

Interactable Methods

Each interactable object provides methods for different interaction types:

• .onPointerEnter(handler) - Handle pointer enter events
• .onPointerLeave(handler) - Handle pointer leave events
• .onPointerMove(handler) - Handle pointer move events over the object
• .onClick(handler) - Handle click events
• .onDrag(handler) - Handle drag events with delta movement values

License

MIT