VB Split Plane

Hello.

I am trying to split a Brep(converted surface) using a plane which is based on the UV values of the surface.

I have consulted RhinoCommon SDk and it explains that there is a split command for Brep's, but after an hour of trying every possible combination of verbage, i am unable to locate the proper syntax.

Has anyone successfully used the split command for a Brep? A split for curve or even a plane would work just as well if any of those are available.

Thanks!

Erin

Replies to This Discussion

Permalink Reply by David Rutten on March 24, 2011 at 10:55am

Hi Erin,

there is no method for splitting a Brep with a Plane. What you need to do is create an actual plane (a surface), then convert that to a Brep and use the Split method with this cutting Brep.

You can use the Plane.ExtendThroughBox method in conjunction with the Brep boundingbox to make sure your cutting plane is big enough.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Erin Colshan on March 24, 2011 at 11:10am

Hey David,

I tried syntax for split method but was unsuccessful. What i did manage was to create surface (P) and...

Dim Pbr As Brep = P.ToBrep

    Dim bfl As rhino.Geometry.Collections.BrepFaceList = Pbr.Faces
    Dim bf As brepface = bfl(0)
    Dim bs As brep = bf.Split(intcrvV, 0.1)
    Dim bsF As rhino.Geometry.Collections.BrepFaceList = bs.Faces

but now the issue is that though it technically splits the brepface, it is not in 2 seperate faces. It remains as one "surface" with a cut line at my split curve. Is there a way to byref 2 seperate pieces?

Hope that is clear,

Thanks!

Permalink Reply by David Rutten on March 24, 2011 at 11:47am

Hi Erin,

you should call Split on the entire Brep, not the individual faces.

I attached a ghx with a VB component for this.

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

splitbrep.ghx, 25 KB

Permalink Reply by amir on August 21, 2011 at 8:59am

thanks ! i was just looking for this and it really helped !

Permalink Reply by amir on November 10, 2011 at 6:43am

David,

that greatly helped me.

on another issue,

maybe i'm missing something, but what can i do if i want to split that brep with a curve that i've projected on the my open brep? basically i'm trying to split a brep with a curve? like the rhino command - split

thanks a lot

amir

Permalink Reply by David Rutten on November 10, 2011 at 7:03am

Hi Amir,

you'll need to extrude the curve through the brep. That's what the Rhino command does as well.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by amir on November 10, 2011 at 8:47am

sorry again for the "delay in understanding"

i have an open brep - basically a loft between two curves

which i want to split with an extruded curve.