summit/frontend/node_modules/@react-three/fiber/readme.md

<h1>react-three-fiber</h1>

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react-three-fiber is a <a href="https://reactjs.org/docs/codebase-overview.html#renderers">React renderer</a> for threejs.

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

```bash
npm install 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 React's scheduling abilities.

#### Can it keep up with frequent feature updates to Threejs?

Yes. It merely expresses Threejs in JSX: `<mesh />` becomes `new THREE.Mesh()`, and that happens dynamically. 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?

<table>
  <tbody>
    <tr>
      <td>Let's make a re-usable component that has its own state, reacts to user-input and participates in the render-loop. (<a href="https://codesandbox.io/s/rrppl0y8l4?file=/src/App.js">live demo</a>).</td>
      <td>
        <a href="https://codesandbox.io/s/rrppl0y8l4">
          <img src="https://i.imgur.com/sS4ArrZ.gif" />
        </a>
      </td>
    </tr>
  </tbody>
</table>

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

function Box(props) {
  // This reference gives us direct access to the THREE.Mesh object
  const ref = useRef()
  // Hold state for hovered and clicked events
  const [hovered, hover] = useState(false)
  const [clicked, click] = useState(false)
  // Subscribe this component to the render-loop, rotate the mesh every frame
  useFrame((state, delta) => (ref.current.rotation.x += delta))
  // Return the view, these are regular Threejs elements expressed in JSX
  return (
    <mesh
      {...props}
      ref={ref}
      scale={clicked ? 1.5 : 1}
      onClick={(event) => click(!clicked)}
      onPointerOver={(event) => hover(true)}
      onPointerOut={(event) => hover(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>,
)
```

<details>
  <summary>Show TypeScript example</summary>
  
```bash
npm install @types/three
```

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

createRoot(document.getElementById('root') as HTMLElement).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

</details>

<details>
  <summary>Show React Native example</summary>

This example relies on react 18 and uses `expo-cli`, but you can create a bare project with their template or with the `react-native` CLI.

```bash
# Install expo-cli, this will create our app
npm install expo-cli -g
# Create app and cd into it
expo init my-app
cd my-app
# Install dependencies
npm install three @react-three/fiber@beta react@rc
# Start
expo start
```

Some configuration may be required to tell the Metro bundler about your assets if you use `useLoader` or Drei abstractions like `useGLTF` and `useTexture`:

```js
// metro.config.js
module.exports = {
  resolver: {
    sourceExts: ['js', 'jsx', 'json', 'ts', 'tsx', 'cjs'],
    assetExts: ['glb', 'png', 'jpg'],
  },
}
```

```tsx
import React, { useRef, useState } from 'react'
import { Canvas, useFrame } from '@react-three/fiber/native'
function Box(props) {
  const mesh = useRef(null)
  const [hovered, setHover] = useState(false)
  const [active, setActive] = useState(false)
  useFrame((state, delta) => (mesh.current.rotation.x += delta))
  return (
    <mesh
      {...props}
      ref={mesh}
      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>
  )
}
```

</details>

---

# Documentation, tutorials, examples

Visit [docs.pmnd.rs](https://docs.pmnd.rs/react-three-fiber)

<a href="https://docs.pmnd.rs/react-three-fiber"><img src="/docs/preview.jpg"></a>

# Fundamentals

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](https://react.dev/learn), especially [the section about hooks](https://react.dev/reference/react). As for Threejs, make sure you at least glance over the following links:

1. Make sure you have a [basic grasp of Threejs](https://threejs.org/docs/index.html#manual/en/introduction/Creating-a-scene). Keep that site open.
2. When you know what a scene is, a camera, mesh, geometry, material, fork the [demo above](https://github.com/pmndrs/react-three-fiber#what-does-it-look-like).
3. [Look up](https://threejs.org/docs/index.html#api/en/objects/Mesh) the JSX elements that you see (mesh, ambientLight, etc), _all_ threejs exports are native to three-fiber.
4. Try changing some values, scroll through our [API](https://docs.pmnd.rs/react-three-fiber/API) to see what the various settings and hooks do.

Some reading material:

- [Threejs-docs](https://threejs.org/docs)
- [Threejs-examples](https://threejs.org/examples)
- [Threejs-fundamentals](https://threejs.org/manual/#en/fundamentals)
- [three.js-journey](https://threejs-journey.com)
- [Discover Threejs](https://discoverthreejs.com)
- [Do's and don'ts](https://discoverthreejs.com/tips-and-tricks) for performance and best practices
- [react-three-fiber alligator.io tutorial](https://alligator.io/react/react-with-threejs) by [@dghez\_](https://twitter.com/dghez_)

# Ecosystem

- [`@react-three/gltfjsx`](https://github.com/pmndrs/gltfjsx) &ndash; turns GLTFs into JSX components
- [`@react-three/drei`](https://github.com/pmndrs/drei) &ndash; useful helpers for react-three-fiber
- [`@react-three/postprocessing`](https://github.com/pmndrs/react-postprocessing) &ndash; post-processing effects
- [`@react-three/flex`](https://github.com/pmndrs/react-three-flex) &ndash; flexbox for react-three-fiber
- [`@react-three/xr`](https://github.com/pmndrs/react-xr) &ndash; VR/AR controllers and events
- [`@react-three/cannon`](https://github.com/pmndrs/use-cannon) &ndash; physics based hooks
- [`@react-three/a11y`](https://github.com/pmndrs/react-three-a11y) &ndash; real a11y for your scene
- [`zustand`](https://github.com/pmndrs/zustand) &ndash; state management
- [`react-spring`](https://github.com/pmndrs/react-spring) &ndash; a spring-physics-based animation library
- [`react-use-gesture`](https://github.com/pmndrs/react-use-gesture) &ndash; mouse/touch gestures
- [`leva`](https://github.com/pmndrs/leva) &ndash; create GUI controls in seconds

# How to contribute

If you like this project, please consider helping out. All contributions are welcome as well as donations to [Opencollective](https://opencollective.com/react-three-fiber), or in crypto `BTC: 36fuguTPxGCNnYZSRdgdh6Ea94brCAjMbH`, `ETH: 0x6E3f79Ea1d0dcedeb33D3fC6c34d2B1f156F2682`.

#### Backers

Thank you to all our backers! 🙏

<a href="https://opencollective.com/react-three-fiber#backers" target="_blank">
  <img src="https://opencollective.com/react-three-fiber/backers.svg?width=890"/>
</a>

#### Contributors

This project exists thanks to all the people who contribute.

<a href="https://github.com/pmndrs/react-three-fiber/graphs/contributors">
  <img src="https://opencollective.com/react-three-fiber/contributors.svg?width=890" />
</a>