Brep CreateFromSweep Fails for shallow Triangles

Rhino Developer
1

Good Morning All,

Using Brep.CreateFromSweep (in C#) I try to sweep the little blue line around the inside of the triangle I get a rather strange result - anyone know how to avoid this? I was expecting the sweep to stay inside the triangle.
Brep.CreateFromSweep(curve, line, true, 0.0001)

image
image458×800 11.4 KB

I have explored the SweepOneRail but had other problems with that and “Note, this class has been superseded by the Rhino.Geometry.Brep.CreateFromSweep static functions.”

BrepSweepFail.3dm (46.7 KB)

2

Hi @david.birch.uk,

Either move the seam of the closed curve to where it intersects the cross section, or move the cross section to the start of the curve.

– Dale