In the attached model I have created a fillet between two surfaces as seen in the image below: [image] The flat top surface was trimmed from it’s original size by the fillet command. This presents an issue when getting the edge curves of the surface. The attached Grasshopper script shows the issu…

The easiest change is to remove the .EdgeCurve from your code. The BrepEdge is a “proxy curve” that is defined on subdomain of the underlying edge curve. The following seems to work as well, and is also more concise: foreach (var face in brep.Faces) { foreach(int ei in face.AdjacentEdges()) …

Thank you, this works for the perimeter edges indeed. I am confused as to why the EdgeCurve property returns a different geometry though. I have been following this guide for breps so far: Brep data structure . I have also a lot of other code that looks at internal loops defining holes trying to exp…

[image] Christos Tsaridis: What you are suggesting is that if I just look at the Edge property instead of the Edge.EdgeCurve itself the 3D curve will be correct? Yes. Also, a BrepEdge may be reversed w.r.t. the referenced curve, so to get the correct head-t-tail orientation of edges along the…

This is very clear, however, since you seem to be knowledgeable on the matter, I would like to run by you my logic of extracting all surface information (especially for NURBS), which I have updated as per your suggestion. convertEdge3D and convertEdge2D are just placeholder methods for converting R…

this is maybe helpful: [image] What is a "brep"? Rhino for Windows for the developers… [brep-data-structure-01] [image]

Trimmed surface edges

Rhino Developer

Tom_P November 1, 2024, 1:25pm 6

this is maybe helpful:

Topic		Replies	Views
Surface boundary lines c# Grasshopper Developer brep-edge	2	1120	November 30, 2020
Brep Edges in C# Grasshopper Developer	6	5469	May 8, 2016
How to extract the border curve of a surface Grasshopper Developer	6	23360	February 25, 2023
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Trimmed surface edges

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