POV-Ray : Newsgroups : povray.binaries.images : Desk lamp: radiosity faked with ambient : Re: Desk lamp: radiosity faked with ambient Server Time
11 Aug 2022 11:30:38 EDT (-0400)
  Re: Desk lamp: radiosity faked with ambient  
From: And
Date: 4 Jun 2022 01:05:00
Message: <web.629ae7d5ffab86f8c11d6faaaa81652d@news.povray.org>
Cousin Ricky <ric### [at] yahoocom> wrote:
> Radiosity is awesome, but it can be very slow, especially at the quality
> levels needed to deal with small, bright objects.  Sometimes, though,
> you can use tricks to fake radiosity.
> I've already mentioned using a spotlight to replace would-be radiosity
> from the hood interior, but what about radiosity *to* the hood interior?
> In the attached montage, the top row has an external light shining into
> the lamp hood; the middle row is in mostly shade; and the bottom row is
> lighted.  The leftmost column uses radiosity with recursion_limit 2, a
> typical setting.  The second column uses 4, a higher setting than is
> normally used, but which illuminates deeply shadowed areas and brings
> out their details.  The third column has no radiosity, and uses a flat
> ambient throughout the scene, varying the ambient only in proportion to
> the diffuse in a given texture.  The rightmost column also uses no
> radiosity, but uses gradient textures with varying ambient levels to
> simulate ambient occlusion.  The ambient levels are all set by the lamp
> macro.  Of course, any ambient setting is necessarily a compromise, but
> I think I've achieved a good balance.

Wow, your rendered image looks nice, and I just understand what is "ambient
occlusion" last week...(because I was looking into the various type of UV-map)

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