I showed them this in Poser 8. They know it does this. This phenomenon was explained to me by Stefan Werner. They know exactly why it happens. They expect you to deal with it. I don't know why they don't just put the spherical formula in.

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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)