Trimmed Surface

Hello all;

I've ran into the same problem time and time again, and always did some work around, but I feel there's something I'm not doing right.

When I manipulate trimmed surfaces in VB the information of the trimming gets lost.

Basically if I cut some holes on a rectangle on grasshopper and then I use the resulting surfaces in VB the VB seem to think I'm just using rectangles.

Any Ideas why this might be ocuring

Thank you in advance

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on May 7, 2014 at 8:31am

Try yourBrep.Faces.ExtractFace[0]

Permalink Reply by Arend on May 7, 2014 at 8:38am

As an addition mostapha:

It's because what grasshopper calls surfaces are actually Breps with one face in RhinoCommon. In RhinoCommon surfaces do not have any trimming information, that why you should use BRep as a type hint instead of surface for script components if you wish to keep the trimming information.

Permalink Reply by Nicolas on May 7, 2014 at 8:45am

Aha so that is why.

Yeah I usually work around it using Breps, and Brep faces, but always wondered if I was doing something wrong and that was I was having to do the little Brep work around.

Good to know why now

Thanks

Permalink Reply by djordje on May 7, 2014 at 11:08am

I wonder what would be the difference between ExtractFace and DuplicateFace methods? They both extract the face from brep and "convert" it into a new brep?

import Rhino

face = brep.Faces[0]
a1 = face.DuplicateFace(True)

faces = brep.Faces
a2 = faces.ExtractFace(0)

DuplicateFace could copy shading meshes. It also "works" on Face list, while ExtractFace works a single face. Is that their main difference? Could one of these two be redundant?

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