Skip Talbot wrote:
> What is producing the speckles in the water?  Distant fish or randomly 
> distributed particles of some sort?
several "layered" medias with granite densities.  You can see a sketch 
of the syntax in my reply to gonzo.

the "pea soup" particles were produced by the layer with
precisely this syntax:

media {        //pea
     scattering {
     	1,
     	1
     	extinction 1.0
     }
 

     density {
     	granite
     	turbulence 0
     	scale .03125
     	color_map {
         	[0.00 rgb 0]
         	[0.85 rgb 0]
         	[0.90 rgb <.004,.006,.002 >*1.4]
         	[1.00 rgb <.004,.006,.002 >*1.4]
     	}
     }
     samples 60, 100
}

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