Support loading the camera included in GLTF files

[TomClabault]

GLTF files can come with a camera included and that can be handy for scenes with a camera already positioned.

I think you're using ASSIMP for scene loading. It should be possible to query the camera after loading the scene.

[Zydak]

ye the GLTF loader part of code is fairly limited, it doesn't care about cameras, lights, also roughness/metallic textures may not always work. So it's definitely not suitable for larger scenes. But fixing it is a pretty low priority for now, since I'd like to fix a couple of other things before that. But I'll keep that in mind 👍