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threejs-interaction

Add raycasting, input handling, and camera controls to Three.js scenes.

1|Updated Dec 6, 2023
Search Tags:#interaction#three.js#hover#raycasting#orbit-controls#pointer-lock#transform-controls
One-click install
npx skills add https://github.com/tadams95/kardashev-network --skill threejs-interaction-tadams95
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: threejs-interaction
Source: https://github.com/tadams95/kardashev-network/tree/main/.claude/skills/threejs-interaction
Command: npx skills add https://github.com/tadams95/kardashev-network --skill threejs-interaction-tadams95

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill enables developers to add robust user interaction to WebGL/Three.js scenes by providing ready-to-use raycasting, input event handling, and camera control utilities.

Core Features & Use Cases

  • Raycasting for object selection and click detection in 3D space.
  • Built-in controls: OrbitControls, PointerLockControls, TransformControls for versatile navigation and manipulation.
  • Touch and hover support for cross-device interactivity, including hover effects and click/tap responses.
  • World-to-screen conversion helpers to map 3D positions to 2D UI coordinates.
  • Use Case: Create an interactive product configurator where users click parts to select and rotate the camera to inspect details.

Quick Start

Start by integrating Three.js in your project and wiring up raycasting with a camera. Add OrbitControls for orbiting, TransformControls for object manipulation, and optional PointerLockControls for FPS-style navigation. Use the Hover logic to highlight objects on hover and implement click handlers to trigger actions.

Frequently Asked Questions about threejs-interaction

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I add click and hover interactions to a Three.js scene?▼

To add click and hover interactions to a Three.js scene, you implement raycasting to detect pointer intersections with 3D objects. This enables object selection and triggers visual hover effects or click actions.

What is the best way to set up camera controls for navigating a WebGL scene?▼

The best way to set up camera controls for navigating a WebGL scene is using built-in Three.js utilities. OrbitControls allow smooth orbiting, while PointerLockControls provide FPS-style navigation for immersive 3D exploration.

Can I use raycasting to select and manipulate 3D objects on touch devices?▼

Raycasting fully supports selecting and manipulating 3D objects on touch devices. The interaction setup includes cross-device input handling for tap events, ensuring click and touch interactions map correctly to 3D object selection.

How do I convert 3D world positions to 2D screen coordinates in Three.js?▼

To convert 3D world positions to 2D screen coordinates in Three.js, you use world-to-screen conversion helpers. These calculate the projected coordinates, allowing you to overlay 2D UI elements precisely on 3D objects.

Does Three.js provide controls for moving and rotating objects directly in the scene?▼

Three.js provides TransformControls for moving and rotating objects directly in the scene. This utility attaches to objects, offering an interactive gizmo that users can drag to manipulate their position and rotation.

Why do I need raycasting for object selection in web-based 3D experiences?▼

Raycasting is required for object selection in web-based 3D experiences because it translates 2D pointer inputs into a 3D ray. This ray detects intersections with scene geometry, determining which specific object the user clicked or tapped.

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