Introduction #

https://docs.pmnd.rs/react-three-fiber/getting-started/examples

Build your scene declaratively with re-usable, self-contained components that react to state, are readily interactive and can participate in React’s ecosystem.

npm install three @types/three @react-three/fiber

Does it have limitations?

None. Everything that works in Threejs will work here without exception.

Is it slower than plain Threejs?

No. There is no overhead. Components render outside of React. It outperforms Threejs in scale due to Reacts scheduling abilities.

Can it keep up with frequent feature updates to Threejs?

Yes. It merely expresses Threejs in JSX, <mesh /> dynamically turns into new THREE.Mesh(). If a new Threejs version adds, removes or changes features, it will be available to you instantly without depending on updates to this library.

What does it look like? #

Let’s make a re-usable component that has its own state, reacts to user-input and participates in the render-loop. ( live demo).

import { createRoot } from 'react-dom/client'
import React, { useRef, useState } from 'react'
import { Canvas, useFrame } from '@react-three/fiber'

function Box(props) {
  // This reference will give us direct access to the mesh
  const meshRef = useRef()
  // Set up state for the hovered and active state
  const [hovered, setHover] = useState(false)
  const [active, setActive] = useState(false)
  // Subscribe this component to the render-loop, rotate the mesh every frame
  useFrame((state, delta) => (meshRef.current.rotation.x += delta))
  // Return view, these are regular three.js elements expressed in JSX
  return (
    <mesh
      {...props}
      ref={meshRef}
      scale={active ? 1.5 : 1}
      onClick={(event) => setActive(!active)}
      onPointerOver={(event) => setHover(true)}
      onPointerOut={(event) => setHover(false)}>
      <boxGeometry args={[1, 1, 1]} />
      <meshStandardMaterial color={hovered ? 'hotpink' : 'orange'} />
    </mesh>
  )
}

createRoot(document.getElementById('root')).render(
  <Canvas>
    <ambientLight />
    <pointLight position={[10, 10, 10]} />
    <Box position={[-1.2, 0, 0]} />
    <Box position={[1.2, 0, 0]} />
  </Canvas>,
)

Show TypeScript example #

npm install @types/three

import * as THREE from 'three'
import { createRoot } from 'react-dom/client'
import React, { useRef, useState } from 'react'
import { Canvas, useFrame, ThreeElements } from '@react-three/fiber'

function Box(props: ThreeElements['mesh']) {
  const meshRef = useRef<THREE.Mesh>(null!)
  const [hovered, setHover] = useState(false)
  const [active, setActive] = useState(false)
  useFrame((state, delta) => (meshRef.current.rotation.x += delta))
  return (
    <mesh
      {...props}
      ref={meshRef}
      scale={active ? 1.5 : 1}
      onClick={(event) => setActive(!active)}
      onPointerOver={(event) => setHover(true)}
      onPointerOut={(event) => setHover(false)}>
      <boxGeometry args={[1, 1, 1]} />
      <meshStandardMaterial color={hovered ? 'hotpink' : 'orange'} />
    </mesh>
  )
}

createRoot(document.getElementById('root')).render(
  <Canvas>
    <ambientLight />
    <pointLight position={[10, 10, 10]} />
    <Box position={[-1.2, 0, 0]} />
    <Box position={[1.2, 0, 0]} />
  </Canvas>,
)

Live demo: https://codesandbox.io/s/icy-tree-brnsm?file=/src/App.tsx

Show React Native example #

For installation instructions see react native installation instructions.

import React, { useRef, useState } from 'react'
import { Canvas, useFrame } from '@react-three/fiber/native'

function Box(props) {
  const meshRef = useRef(null)
  const [hovered, setHover] = useState(false)
  const [active, setActive] = useState(false)
  useFrame((state, delta) => (meshRef.current.rotation.x += delta))
  return (
    <mesh
      {...props}
      ref={meshRef}
      scale={active ? 1.5 : 1}
      onClick={(event) => setActive(!active)}
      onPointerOver={(event) => setHover(true)}
      onPointerOut={(event) => setHover(false)}>
      <boxGeometry args={[1, 1, 1]} />
      <meshStandardMaterial color={hovered ? 'hotpink' : 'orange'} />
    </mesh>
  )
}

export default function App() {
  return (
    <Canvas>
      <ambientLight />
      <pointLight position={[10, 10, 10]} />
      <Box position={[-1.2, 0, 0]} />
      <Box position={[1.2, 0, 0]} />
    </Canvas>
  )
}

First steps #

You need to be versed in both React and Threejs before rushing into this. If you are unsure about React consult the official React docs, especially the section about hooks. As for Threejs, make sure you at least glance over the following links:

Make sure you have a basic grasp of Threejs. Keep that site open.
When you know what a scene is, a camera, mesh, geometry, material, fork the demo above.
Look up the JSX elements that you see (mesh, ambientLight, etc), all threejs exports are native to three-fiber.
Try changing some values, scroll through our API to see what the various settings and hooks do.

Some helpful material:

Threejs-docs and examples
Discover Threejs, especially the Tips and Tricks chapter for best practices
Bruno Simons Threejs Jouney, arguably the best learning resource, now includes a full R3F chapter

Eco system #

There is a vibrant and extensive eco system around three-fiber, full of libraries, helpers and abstractions.

@react-three/drei – useful helpers, this is an eco system in itself
@react-three/gltfjsx – turns GLTFs into JSX components
@react-three/postprocessing – post-processing effects
@react-three/test-renderer – for unit tests in node
@react-three/flex – flexbox for react-three-fiber
@react-three/xr – VR/AR controllers and events
@react-three/csg – constructive solid geometry
@react-three/rapier – 3D physics using Rapier
@react-three/cannon – 3D physics using Cannon
@react-three/p2 – 2D physics using P2
@react-three/a11y – real a11y for your scene
@react-three/gpu-pathtracer – realistic path tracing
create-r3f-app next – nextjs starter
lamina – layer based shader materials
zustand – flux based state management
jotai – atoms based state management
valtio – proxy based state management
react-spring – a spring-physics-based animation library
framer-motion-3d – framer motion, a popular animation library
use-gesture – mouse/touch gestures
leva – create GUI controls in seconds
maath – a kitchen sink for math helpers
miniplex – ECS (entity management system)
composer-suite – composing shaders, particles, effects and game mechanics

How to contribute #

If you like this project, please consider helping out. All contributions are welcome as well as donations to Opencollective, or in crypto BTC: 36fuguTPxGCNnYZSRdgdh6Ea94brCAjMbH, ETH: 0x6E3f79Ea1d0dcedeb33D3fC6c34d2B1f156F2682.

Backers #

Thank you to all our backers! 🙏

Contributors #

This project exists thanks to all the people who contribute.