Try this for a water plane. The Bump value (.05) is in inches. If you're Poser units are set to feet or meters or anything else - yours won't match. Either do the conversion yourself, or switch your units to inches before typing in .05. Then you can switch it back to your favorite unit.

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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)