If I want to sell a 3D object at Turbosquid how should I export it? .blend or .obj?
And another question: I created a house and made a new seperate group for each floor. Should I leave it like that (pic related) or does it have to be one connected object?
Why not all the above? Include an FBX too.
There is nothing wrong with submeshes. Leave it disconnected, but organized sensibly. Call the outer walls "outer walls" and the first floor "first floor."