As an offshoot of this geom-injection thing, the question naturally arises as to whether it would be possible to inject the high res head into the low res figure.

I have tried injecting the high res head, eyes, and neck into the low figure. There were two consequences. Consequence number one, Poser started to sulk and did a partial hang. Consequence number two, the high res neck mesh threw a fit where it met the low res chest mesh.

I tried the same thing again, but this time I disabled the "Bend Body Parts" switch in the Display menu. This time Poser did not complain, and everything looks fine, but of course the mesh is no longer welded.

Turning off 'bend' has two consequences, it breaks the welding and turns off the joint parameters. Now if luck is on my side, the problems are caused by the welding and not the JPs. This raises another question. If I had a neck geom that matched the low res chest at the bottom and the high res head at the top, would I be able to transplant the high res head onto the low res body via a pose file?

Perhaps, perhaps not. I don't know the sufficient conditions for welding. Is it sufficient that all the vertices match at the seam, or does the winding order also play a part? Does anyone feel like constructing a hybrid neck so I can test this? My own modelling skills are none existent, so I can't make the neck myself.