The dot key is the bee's knees. Before I discovered it, I felt like I was very close to pulling out my hair in bunches.

I looked at a scene file including subdivision morphs, and they seem to be stored as regular deltas with an extra attribute specifying which subdivision level they belong to. No idea how they are encoded in PMDs, but I hope by tweaking adp001's code I should be able to find out. The remaining bit is matching the subdivided mesh to the original, but I know how to go about that.

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