Using GLTF correctly

Hi everyone, I’m new here and I don’t know what’s wrong with my code
I’ve downloaded this 3d model

But this is what I see

As I understand problem is with lights/shadows? Is it possible to import them too from GLTF file or I’ll have to setup them myself each time I use different model? I’ve also check it on GLTF viewer and it looks good there too, is there any kind of default template for lights/shadows they’re using?

Please use the examples on the three.js website for suggestions on how to do lighting:

Most importantly, you need to set an environment map to have good reflections.