Hi
I have made some progress:
Thanks again, Dorin!
Just to recap what I did: I actually split the roof in many seperate parts and modeled each of the both sides of the house on its own. I always made the other side invisible. I calculated the slope of the roof by using the measures (around 50°).
As dorin wrote I used one room to cut out a part of the window and made all of the slopes around it 90° and these sides also invisible. Afterwards I inserted as well one roof over the dormer, using another room and ond the rest of the roof until the roof top with a final room. Of course I had to do some moving around and for whatever reason not everything was in the right place (elevation, etc.), even after copying roof objects. However, I am glad to have reached this point. Now I have to find a way to fill the sides of the dormers and for this I posted a new thread, because I need to fill non-perpendicular triangles of which I don't know the exact measures.
