Learn Threejs - 9 Code Examples & CST Typing Practice Test
Three.js is a popular open-source 3D JavaScript library that simplifies creating, displaying, and animating 3D graphics in web browsers using WebGL. It provides abstractions for cameras, lights, materials, geometries, and scene management, making 3D web development accessible and efficient.
Learn THREEJS with Real Code Examples
Updated Nov 26, 2025
Installation Setup
Include via npm (`npm install three`) or CDN
Import core classes (Scene, Camera, Renderer, etc.)
Create a scene and camera
Initialize WebGLRenderer and attach to canvas
Add objects, lights, and start animation loop
Environment Setup
Modern browser with WebGL support
Node.js for local development
Bundler like Vite, Webpack, or Parcel
Access to 3D models and textures
Optional: WebXR-capable device
Config Files
index.html - canvas and script
main.js - Three.js scene setup
models/ - 3D assets
textures/ - image files
utils/ - helper functions
Cli Commands
npm install three
vite dev / webpack dev
npm run build
npx serve to host locally
Use Three.js editor for scene prototyping
Internationalization
Three.js is language-agnostic
Text overlays handled by JS/HTML
Localization independent of 3D rendering
Model/texture content may need translation
Number/date formatting in UI handled separately
Accessibility
Provide alternative text for canvas
Keyboard navigation for interactions
Consider motion sensitivity for animations
Screen readers interact with HTML UI
Three.js does not handle accessibility directly
Ui Styling
Handled in HTML/CSS for overlays
Canvas displays 3D content
Responsive layout adjusts canvas size
Interaction handled via JS events
Three.js only manages rendering, not UI
State Management
Scene stores object hierarchy
Meshes maintain local transforms
Animation mixer updates object state
Camera controls user viewpoint
Renderer draws current state each frame
Data Management
Load models and textures efficiently
Reuse geometries and materials
Minimize draw calls for performance
Use instancing for repeated objects
Optimize texture resolution and compression
Frequently Asked Questions about Threejs
What is Threejs?
Three.js is a popular open-source 3D JavaScript library that simplifies creating, displaying, and animating 3D graphics in web browsers using WebGL. It provides abstractions for cameras, lights, materials, geometries, and scene management, making 3D web development accessible and efficient.
What are the primary use cases for Threejs?
Interactive 3D websites and apps. Product visualization and configurators. Web-based games using WebGL. AR/VR experiences via WebXR. Scientific and architectural visualizations
What are the strengths of Threejs?
Simplifies WebGL 3D rendering. Large ecosystem with plugins and examples. Flexible and extensible. Active community support. Good performance for real-time 3D web apps
What are the limitations of Threejs?
Not as low-level as raw WebGL or WebGPU. Performance bottlenecks with very large scenes. Limited compute capabilities (no native GPU compute). Some advanced effects require custom shaders. Debugging can be challenging for complex scenes
How can I practice Threejs typing speed?
CodeSpeedTest offers 9+ real Threejs code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.