The whole approach is actually very differnt to UV mapping. UV mapping would assign a particular part of the reflection map to each nail. The approach Poser uses for reflections is more like a world space mapping, where what you see on the nail depends on which way it's facing and where in three dimensional world space the nail is at the time. If you animate it, you'll see how the reflection changes as you move the nail around. I don't know exactly how they have it set up. That's something I guess only the original programmers would know, since it's only an approximation and there are a bunch of different ways you could do it. The main thing is, if you have two fingers close together in the scene with the nails facing the same way, you'll see almost exactly the same thing on each, just as you would if you had two little chrome objects close to each other and pointing the same way in the real world. If you have the fingernails pointing in different directions, you'll see different bits of the reflection map on them. You might consider looking for advice in Traveler's forum at www.runtimedna.com. He does a lot of work with reflection maps as a way of improving the look of human models, so he'd be a good person to ask.

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