title: How to load mtl files with gltf in react-three-fiber
body: <p>I have downloaded a set of files from a site and exported the glb, gltf, and mtl files in blender. I can get the glb or gltf file to display in the react-three-fiber scene, but I am not sure how to get the textures to display properly. I have come across a couple of demos but they seem old and what would not work.</p>
  <p>Here is how I load the file.</p>
  <pre><code>import desk from '../../assets/desk.gltf'; // or .glb file
  
  const [gltf, set] = useState();
  useMemo(() =&gt; new GLTFLoader().load(desk, set), []);
  return gltf ? &lt;primitive object={gltf.scene} scale={[0.05, 0.05, 0.05]} position={[0,0,1]} 
  rotation={[Math.PI/2,Math.PI,0]}/&gt; : null
  </code></pre>