Poser 5 could be used to generate the IBL image, but you can't actually use the resulting image in Poser 5. Poser 5 doesn't support image based lights at all. So I can't see what use it is to render these in P5, unless you just enjoy making strangely distorted images.

Plus, my experiences with P5 and reflection/refraction were less than ideal.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)