POV-Ray : Newsgroups : povray.binaries.images : billboard tint : Re: billboard tint Server Time
25 Feb 2024 07:59:33 EST (-0500)
  Re: billboard tint  
From: Mike Miller
Date: 3 Nov 2023 18:30:00
Message: <web.6545736a310e11ef22cdb33dabc9342@news.povray.org>
William F Pokorny <ano### [at] anonymousorg> wrote:
> 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.

Thanks Bill,
my scene is enclosed/surrounded with a mapped sphere object. I did try Alain's
idea....same results. I added depth to the billboards but it renders both front
and back resulting in a double image. Is there backface culling in POV? ...don't
see it in the help files. I'll try a clipped plane just to test.

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