Working on it.

You might start with ripples.

Ripples are nearly sinusoidal and we can get such shapes from a single node such as the Clouds node. Also, we don't really need displacement for it since the amount of displacement is very small. But I'll show it in displacement. You can use bump instead.

My display unit is inches!!! The displacement value here is .75 inches. If you do not set your Poser to inches, you'll have to type in something else. For PNU it would be .75 / 103.2, which is .00726744.

To get bigger waves we have to add many nodes together. Poser doesn't have a built-in node that does the proper math for ocean waves. I'm still trying to figure out what that math should be for all wind speeds from 1 to 100 MPH. It's complicated.

So start small and deal with ripples first.

You might also try to skip the attenuation of light and instead just darken and colorize the refraction as I've done here. I'm not using attenuated lights in this render.

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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)