It could also be very useful to include data about neighbor verts or polys, the polygons to which a vertex belongs, the vertices of a poly, and possibly things like the polygon center or the material of a poly (or even vert).  And edges of polys, edge membership for vertices.  In trying to create a class for verts and polys, I was going to try to accomodate these things.  They've proven useful in the Geom module, at any rate.

But I'm getting carried away, huh?  <Shifty-eyed emoticon recurs>

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.