ReddRadar
Agent skill
r3f-fundamentals
React Three Fiber fundamentals - Canvas, hooks (useFrame, useThree), JSX elements, events, refs. Use when setting up R3F scenes, creating components, handling the render loop, or working with Three.js objects in React.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/r3f-fundamentals
SKILL.md
React Three Fiber Fundamentals
Quick Start
import { Canvas } from '@react-three/fiber'
import { useRef } from 'react'
import { useFrame } from '@react-three/fiber'
function RotatingBox() {
const meshRef = useRef()
useFrame((state, delta) => {
meshRef.current.rotation.x += delta
meshRef.current.rotation.y += delta * 0.5
})
return (
<mesh ref={meshRef}>
<boxGeometry args={[1, 1, 1]} />
<meshStandardMaterial color="hotpink" />
</mesh>
)
}
export default function App() {
return (
<Canvas camera={{ position: [0, 0, 5], fov: 75 }}>
<ambientLight intensity={0.5} />
<directionalLight position={[5, 5, 5]} />
<RotatingBox />
</Canvas>
)
}
Canvas Component
<Canvas
camera={{ position: [0, 5, 10], fov: 75, near: 0.1, far: 1000 }}
gl={{ antialias: true, alpha: true }}
dpr={[1, 2]}
shadows
frameloop="always" // 'always' | 'demand' | 'never'
onCreated={(state) => console.log('Ready')}
style={{ width: '100%', height: '100vh' }}
>
<Scene />
</Canvas>
useFrame Hook
useFrame((state, delta) => {
// state: clock, camera, scene, gl, pointer, viewport
// delta: time since last frame in seconds
meshRef.current.rotation.y += delta
// Time-based animation
const t = state.clock.elapsedTime
meshRef.current.position.y = Math.sin(t) * 2
})
// Render priority (lower = earlier)
useFrame(() => {}, -1) // Pre-render
useFrame(() => {}, 1) // Post-render
useThree Hook
const camera = useThree((state) => state.camera)
const gl = useThree((state) => state.gl)
const size = useThree((state) => state.size)
const viewport = useThree((state) => state.viewport)
const invalidate = useThree((state) => state.invalidate)
JSX Elements
<mesh position={[0, 0, 0]} rotation={[0, Math.PI, 0]} scale={1.5}>
<boxGeometry args={[1, 1, 1]} />
<meshStandardMaterial color="red" />
</mesh>
<group position={[5, 0, 0]}>
<mesh>...</mesh>
<mesh>...</mesh>
</group>
// Nested properties
<mesh position-x={5} rotation-y={Math.PI} />
<directionalLight shadow-mapSize={[2048, 2048]} />
Event Handling
<mesh
onClick={(e) => {
e.stopPropagation()
console.log(e.point, e.distance, e.object)
}}
onPointerOver={(e) => setHovered(true)}
onPointerOut={(e) => setHovered(false)}
onPointerMove={(e) => console.log(e.uv)}
/>
primitive & extend
// Use existing Three.js objects
<primitive object={gltf.scene} position={[0, 0, 0]} />
// Register custom classes
import { extend } from '@react-three/fiber'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
extend({ OrbitControls })
<orbitControls args={[camera, gl.domElement]} />
Performance
// Use refs for animations (avoid re-renders)
const meshRef = useRef()
useFrame(() => {
meshRef.current.rotation.y += 0.01
})
// Isolate animated components
function Scene() {
return (
<>
<StaticMesh />
<AnimatedMesh /> {/* Only this updates */}
</>
)
}
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