Equivalent GH Component to the Rhino BooleanSplit Command Available?

The Rhino BooleanSplit command has the nice feature of taking a polysurface (solid) and dividing it into several parts using a surface. In the particular case I'm using it makes two solids from one - split right along the surface. Just how I like it :)

I don't see a native GH component to do this. I've looked into using a VB Script component. I've found code in the forums like this:

Private Sub RunScript(ByVal surface_1 As Surface, ByVal volume As Brep, ByRef A As Object)

Dim s_1 As Brep

s_1 = surface_1.ToBrep
Dim s_2 As New List(Of Brep)

s_2.Add(s_1)
Dim v_1 As New List(Of Brep)

v_1.Add(volume)
Dim inter As System.Collections.Generic.IEnumerable(Of Brep)

inter = Rhino.Geometry.Brep.CreateBooleanDifference(s_2, v_1, 0.01)
A = inter

End Sub

This comes close to working - but it doesn't produce separate solids. Instead it makes a new surface as shown in the attached image.

Has anyone found a way to actually duplicate what BooleanSplit does?

Thanks,

-MM

Attachments:

booleanSplit1.jpg, 93 KB

Replies to This Discussion

Permalink Reply by David Rutten on March 30, 2011 at 4:44am

Hi MM,

you could try flipping the cutting surface and doing another boolean difference. It would take twice as long, the beauty of BooleanSplit is that it only performs the intersection logic once. But I don't think the function is exposed (I'll dig around a bit, maybe I can write a RhinoCommon wrapper for it).

Another approach is to split the shape with the surface, then the surface with the shape. You should now have all the facets needed to create the two shapes, but finding which ones belong together might be tricky.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by MkMrA2 on March 31, 2011 at 3:47am