Attached Link: http://www.renderosity.com/mod/forumpro/showthread.php?message_id=2741994&ebot_calc_page#message_2741994

Have a look at the link - that might help. In that thread i show how to do fake caustic lighting. Look at the sub and you can see that it is lit like it is underwater.

You haven't said if you want to show the surface or not as in the reference pick.

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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)