React Three Fiber — Build 3D Scenes with React Components

Introduction

React Three Fiber (R3F) is a React renderer for Three.js maintained by the Poimandres collective. It expresses Three.js objects as React components so you can use hooks, context, suspense, and the rest of the React API to manage 3D scenes without imperative boilerplate.

What React Three Fiber Does

• Maps every Three.js class to a declarative JSX element
• Manages the render loop, resize handling, and scene graph automatically
• Integrates with React lifecycle for state, refs, and effects
• Supports pointer events on 3D objects with raycasting built in
• Works with the @react-three/drei helper library for common abstractions

Architecture Overview

R3F implements a custom React reconciler that translates JSX tree changes into Three.js scene graph operations. The Canvas component sets up a WebGL renderer, camera, and animation loop. Each frame, R3F calls subscriber callbacks registered via useFrame, then renders the scene. The reconciler handles creating, updating, and removing Three.js objects in sync with React state.

Self-Hosting & Configuration

• Install three and @react-three/fiber via npm or yarn
• Wrap your 3D scene in a Canvas component to initialize WebGL
• Use the camera prop or a custom camera component for projection control
• Add @react-three/drei for loaders, controls, environment maps, and helpers
• Configure frameloop to 'demand' for scenes that only update on interaction

Key Features

• Full React integration with hooks, suspense, error boundaries, and portals
• Automatic dispose and cleanup when components unmount
• Built-in pointer events with hover, click, and drag on meshes
• Performance tools including instancing, LOD, and on-demand rendering
• Ecosystem of companion libraries (drei, postprocessing, rapier physics)

Comparison with Similar Tools

• Plain Three.js — full control but requires imperative code and manual lifecycle management
• Babylon.js — built-in editor and inspector, heavier runtime, no React reconciler
• A-Frame — HTML-based declarative 3D but tied to its own entity-component system
• Threlte — similar concept for Svelte instead of React
• PlayCanvas — cloud-based editor focus, commercial orientation

FAQ

Q: Do I need to know Three.js to use R3F? A: Basic Three.js concepts (meshes, materials, lights) help, but you write them as JSX props instead of imperative code.

Q: Does R3F add overhead over raw Three.js? A: Minimal. The reconciler adds a thin layer; render-critical paths remain native Three.js calls.

Q: Can I mix R3F with existing Three.js code? A: Yes. Use useThree() to access the renderer, scene, and camera, then attach imperative objects via refs.

Q: Does it work with React Native? A: Yes, via expo-gl and @react-three/fiber/native for mobile 3D rendering.

Sources

• https://github.com/pmndrs/react-three-fiber
• https://r3f.docs.pmnd.rs/getting-started/introduction