1-16chrd, an interesting idea...

[Philippe Hurbain]

I really don't know how to describe this in a way that makes sense. The following is the best I could come up with.

Thanks Travis - difficult to explain indeed, that's why I didn't chime in.

Primref is also missing an entry for related ering primitives (1-4ering, 4-4ering). Something like "Several 1-16chrd placed around a circle, used to fill-in gaps between simple geometry and curved primitives during primitive substitution. See 1-16chrd for more details."