How to properly close surfaces in Rhino from complex Curves?

[Gaetano1 (Gaetano)]

Hello guys, sorry for the title but i’m not natively eanglish speaker. So, I’m relatively new to Rhino (I’ve been using it for about a year). I’ve always had a good experience with this program except for one thing: I’ve never been able to figure out how to properly close surfaces, starting from curves. Let me explain better: I can create a surface from planar curves, but when it comes to curved curves or surfaces with multiple curvatures, I can never find a solution. The only situation where I’m just right is using the “patch” tool, but it creates surfaces that are not very detailed and precise, and they don’t follow to the curves I’ve created. Does anyone more experienced know the right method to model correctly? Thanks. Ps. i’ve attached an image of the problem, and the rhino file.

StrutturaFINALE.3dm (1.7 MB)

[pascal (Pascal Golay)]

Hi Gaetano - since the openings are planar, both of these can be closed by _Join, followed by _Cap. You can just create the planar surface and not join by using _PlanarSrf and selecting the surface edges around the ‘hole’. Is that what you mean?

Patch would also work OK if you un-check Tangency

but for planar openings, Cap or PlanarSrf are fine.

-Pascal