I am now back to working on the script and think I have a good plan for figuring out the u- and v- directions. It will not be exactly what Poser uses (because I still haven't been gifted the source code :grin:), but that should be okay as long as the unmorphed mesh is reasonably smooth after subdividing, which is what one would expect.

I've also experimented with tricking the Poser Morph Tool into baking down the morph to the lower subdivision levels. I opened the morph for editing, checked "Bake down for subdivision", set the radius and strength to the minimum non-zero values, found a vertex and dragged at it a tiny bit. The morph tool seems to do the baking down for the full mesh after every individual edit, which might explain it's painful slowness, but is to our advantage here because after this little stunt the complete morph has been baked down.

I'll experiment with this some more to see if there are easier ways of triggering the baking. But honestly I'm really quite happy that this worked because doing the baking down in the script is looking increasingly impractical. :thumbsup:

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