Thanks. Late last night I actually found your medial axis definition from last year and tried it.
It worked perfectly visually, but I couldn’t get it to produce closed polycurves reliably, even when I used them to split a rectangle and then used the new surface borders. Because I’m using this to create machining regions in RhinoCAM, I need to output closed, non-self-intersecting curves.
I’ll play with these definitions and see how I do. The cones seem promising because they seem like they’ll avoid the degree2 curves from that old definition, which I think was the reason I couldn’t get closed polylines.