I am struggling with the following. Muddy water flowing out of an 
estuary towards sea, eventually sinks down/mixes with sea water some 
distance from the coast. The easy approach is shown in the image below: 
two boxes, sliced by a plane, and filled with two different media each 
(one absorption, one scattering).

I would prefer a more diffuse approach using a spherical pattern for 
instance, but I am unable to come up with a working code that can do 
that properly.

Any idea? Thanks!

Thomas

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