Just a quick note: it seems that the numbering for the vertices of a subdivided mesh is a bit more complicated than I thought. I had a go with Antonia and not even the numbering of the original vertices is stable when subdividing. A possibility is that the numbering is done per actor, or maybe the infamous ghost vertices play a role. A bit off-topic for this thread, though, better to discuss it in the other one.

Happy Isaac Newton's birthday!

-- I'm not mad at you, just Westphalian.