I didn't make as much progress as I wished today, but I managed to come 
up with the attached test image. An isosurface created using povr's 
hard_object(1) and a mode of a new f_mult1to8pairs() function. Details 
later. Render time was just under 11 minutes on my 2 core i3.
Bill P.
(1) - As Christoph suggested long ago - need better names than 
hard_object and soft_object. Not very descriptive of either.
 
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Preview of image 'hard_objectcovid.png'
   
   
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