Long time lurker, newbie poster.
I have been trying, to no avail, to create the type of volumetric lighting found in the following reference image:
I have used multiple water materials, tried both methods of volumetrics, I have even used a transparent, non-reflective material to represent water just for a test and I can't get anything to work. With volumetrics enabled through the parti_volume shader, I can get volumetrics that start at the water's surface, but anything beneath the surface is simply not there.
I have also tried a cube for the water as well as a simple plane. Either way (and with the correct options in the material for planar vs. solid geometry in the water material) gives the same failed result.
The following is the photometric target light with the sun and sky off, first with the water material, second with the material off.
I have done a lot of googling, reading, and such. There are a ton of tutorials on underwater scenes, water textures, and volumetric lighting, none of which help with the specific issue I'm trying to wrap my head around.
And the scene file, should anyone want to play with it. It's a basic file so I could play around with settings before I roll it out to the larger project.