I am new at this and tried to make a map which isn't so big. But i don't know how to optimize it. Can someone download, revise and send back? Thanks in advance.
its a three-store building with many rooms. some rooms are empty and not seen, not used. but i can't delete them, since their walls are in the same time walls of other rooms. the question is shall i leave them empty as they are or fill them with brushes?