Hi,
I am doing sub-object selection to extrude the edge of a Brep here. What do the arrows originating from the edge represent ? How to create these vectors with RhinoCommon?
Do they represent a type of frame at that parameter ?
The arrows show which surface the edge belongs to when there are two adjacent surfaces.
I think the realtime display should be improved. I don’t see the arrows change when hovering either of the edges in the Selection menu.
check for display conduits
my guess you have to do it with Drawcurve and DrawDirectionArrow - not sure if there is a single method among all those Draw… methods that can do it in one go.
Calculate the direction by cross product of Edge-Tangent and Suface -Normal
To get the correct direction- notice that outer loops of a trimmed face a CCW, inner are CW.
if you have further questions - or if you managed to do it - post some code snippets.
kind regards - tom
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