OffsetBrep in c# is wrongs

why?Offset.tBrep in c# is wrongs.
but in rhino(offsetSurface is correct)(in this Object!) (9.4 KB)

I think it should be your surface problem.This should be a polysurface, not an Untrimmed Surface.
So I baked the geometry to the rhino. Pick up the GH again and it will succeed.
1 (13.1 KB)

yes when use this method to extrude(polysrf) offsetSrf is correct! :point_down:

Polysrf.Faces.SplitKinkyFaces(RhinoDocument.ModelAbsoluteTolerance); (9.6 KB)

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