Hello guys!
Has anyone ever used IfcSeamCurve in any project? I know you have it available, but I can’t apply it, I would like to simulate a basic cylinder only.

I haven’t implemented it personally yet, but I know it’s a construct that maps well to the typical brep software libraries (e.g Topology and Geometry in Open CASCADE. Part 3 - Open CASCADE notes) [Not sure if a dedicated semantic construct is necessary for it though. If you have two pcurves for an edge on the same face that are coaxial and reversed you know it is a seam.]

If you just want to exchange a cylinder you can exchange it as a extrusion of a circle profile def, which is well supported in applications and also in 2x3.