curved roof... .

[ciombi]

Hello everyone.. .
It won't be that easy to explain my question, but I try.
then I have to realize a curved roof that but I have no idea where to start. . .
Moreover this roof in the plant has as external perimeter a square but in the center must have a round hole.. .
in practice it must be a dome with a rectangular base but that then in the center comes back.. .
Is there anyone who can help me?
I'll try to get an image of what I have to do. . .

 

[nativo]

Forse con entension nucleus? http://3.bp.blogspot.com/-ijtzsnkrm5o/tzmdmp6qwri/aaaaaaaaa4e/hvuw_tkfcwq/s1600/nurb.pngor as described qui

 

[ciombi]

That's exactly what I have to do. .
I hope I can. . .
Don't you know if there are any tutorials? I am not so experienced in creating masses or families. . .
Thank you very much.. .

 

[Tristan]

I would create the form in autocad or rhino after which I have the amount as mass and I hang over the cover.. .