Sorry if you mentioned it, but in all this discussion of clever ways to do a z-depth render, I didn't see anybody mention that it's now built into Poser (maybe only Pro). Are you guys aware of this? All those old-time tactics are not needed anymore. With a simple checkbox in render settings, you can get it directly, and it can be stored with much more precision than 8 or 16 bits.

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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)