On 11/3/23 16:44, Mike Miller wrote:
> I'll mess around with it a bit more before giving up.

Alain just mentioned media -and his opening comment makes me think I'm 
assuming the billboards position incorrectly...

With media - where we almost always use contained media these days - we
sometimes forget we can still implement global media.

It might be worth a try in your case. As long as the billboards have 
enough depth POV-Ray can track whether inside or outside the billboards, 
but not a depth appreciable enough(a) to greatly affect the media 
results - I think it might work.

(a) Try to stick with more perpendicular billboards with respect to the 
initial camera rays.

You'll need a complete scene backstop shape at "media fog" end effect 
distance. In other words, you cannot have only 'background' or a 
'skysphere', global media needs rays which eventually terminate 
somewhere with a final intersection.

Bill P.

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