SubD Edge Tag sharp

openNURBS
1

I am trying to understand SubD Edge sharpness using OpenNURBS, as implemented in Rhino v8. The documentation says that to change the sharpness, the edges should be tagged as ON_SubDEdgeTag::Sharp. However, such a tag is not available.

I also see ON_SubDEdgeSharpness function.

Please advise.

2

@dalelear - is this something you could help with?

3

The documentation is wrong. Sharp edges have a smooth tag and a nonzero sharpness. Both ON_SubDEdge::IsSmooth() and ON_SubDEdge::IsSharp() will return true if an edge is sharp.