React Three Fiber useThree

Optimization

// Will only trigger re-render when the default camera is exchanged
const camera = useThree((state) => state.camera)
// Will only re-render on resize changes
const viewport = useThree((state) => state.viewport)
// ❌ You cannot expect reactivity from three.js internals!
const zoom = useThree((state) => state.camera.zoom)

React Three Fiber Documentation

Hooks allow you to tie or request specific information to your component. For instance, components that want to participate in the renderloop can use useFrame, components that need to be informed of three.js specifics can use useThree and so on. All hooks clean up after themselves once the component unmounts.

https://docs.pmnd.rs/react-three-fiber/API/hooks