USD is fairly widely used. But it's not "code" in the sense that I mean it. It's (mostly) declarative (like HTML) so I lump it in with obj, fbx and gltf. I am

USD is fairly widely used. But it's not "code" in the sense that I mean it. It's (mostly) declarative (like HTML) so I lump it in with obj, fbx and gltf. I am assuming code means "executable code" - I know the boundaries are fuzzy here and some file formats are Turing complete - but I guess what I'm saying is that I'm still not sure what you're asking!