brunsviga-demo/src/Renderer.tsx

import { Canvas, useFrame, useLoader } from '@react-three/fiber';
import { Circle, Clone, ContactShadows, OrbitControls } from '@react-three/drei'
import { Suspense, useRef } from 'react';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';

function Gear(props: any) {
  const gltf = useLoader(GLTFLoader, './gear.glb');

  const gear1Ref = useRef<any>()
  const gear2Ref = useRef<any>()

  const speed = 2.5;

  useFrame(({ clock }) => {
    gear1Ref.current.rotation.z = clock.getElapsedTime() * speed + Math.sin(clock.getElapsedTime()) * speed
    gear2Ref.current.rotation.z = -clock.getElapsedTime() * speed - Math.sin(clock.getElapsedTime()) * speed
  })

  return <>
    <Clone ref={gear1Ref} {...props} object={gltf.scene} />
    <Clone ref={gear2Ref} position={[2.5,0,0]} {...props} object={gltf.scene} />
  </>
}

function Renderer() {
  return (
    <div className='flex flex-col h-screen gradient'>
      <Canvas camera={{ position: [-8, 5, 8] }}>
        <Suspense fallback={null}>
          <ambientLight />
          <directionalLight />
          <Gear />
          <ContactShadows
            scale={60}
            position={[0, -2, 0]}
            opacity={2.0}
            blur={2}
            resolution={512}
          />
          <Circle args={[10]} position={[0,-2.001,0]}  rotation-x={-Math.PI / 2} receiveShadow>
            <meshBasicMaterial color={[0.8,0.8,0.8]}/>
          </Circle>
          <OrbitControls target={[0, 0, 0]} maxPolarAngle={Math.PI / 2.0} />
        </Suspense>
      </Canvas>
    </div>
  );
}

export default Renderer