Isocurves for Trimmed Surfaces_C#

Rhino Developer
1

Hello,
I am struggling to understand how the isocurve component in grasshopper works on trimmed surface.
I used RhinoCommon to achieve similar result like GH isocurve component but I was unable to get same result.
Thanks in advance. attached images.
Pic 1) Grasshopper result

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image715×651 81 KB

Pic 2) C# script result…What do I need to do before using Surface.IsoCurve() method???

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image743×649 90.2 KB

2

A surface with trims is not a surface anymore but a brepface. when you apply a surface method it is automatically ignoring the trims since it is treated as a surface.
Probably this one is the right method:
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_BrepFace_TrimAwareIsoCurve.htm

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