POV-Ray : Newsgroups : povray.beta-test : Radiosity gives only black images : Re: Radiosity gives only black images Server Time
30 Jun 2024 17:34:44 EDT (-0400)
  Re: Radiosity gives only black images  
From: Darats
Date: 2 Sep 2010 07:45:00
Message: <web.4c7f8d89e00779fb6dea8f700@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 01.09.2010 16:55, schrieb Darats:
> > Hi,
> >
> > I've just tried the new 3.7 beta 38 for windows (which is the first beta release
> > I've tried).
> >
> > My problem is that when I try to render the rad_def_test.pov, I only get a black
> > image, and I can't figure out why.
>
> POV-Ray 3.7 complements the "ambient" finish parameter with another one,
> "emission", to distinguish between some added brightness for fake
> ambient illumination (classic "ambient" keyword), and genuine object
> glow (new "emission" finish keyword).
>
> The fake ambient illumination is now automatically turned off when
> radiosity is used, as that's exactly what radiosity is designed to
> compute more realistically. (Think of "ambient_light" automatically
> being forced to zero.) As a consequence, the "ambient" mechanism can no
> longer be used to model light sources in radiosity-only scenes.
>
> Enter emission. This new mechanism does virtually the same as "ambient",
> except that it is unaffected by the global "ambient_light" parameter,
> and is active in both classic and radiosity scenes.
>
>
> There are two simple solutions to fix existing scenes:
>
> (A) Replace the "ambient" keyword with "emission" wherever it is used to
> model a light source.
>
> (B) Alternatively, place a "#version 3.6" statement in the scene.
> POV-Ray will then revert to a backward-compatibity mode, leaving the
> "ambient" mechanism active in radiosity scenes.
>
>
> > I'm sure it's just some settings I haven't thought about but I don't know what.
>
> Nothing wrong on your side. The sample scenes just haven't been updated
> yet to match the new mechanism.

All right, I did the #version 3.6 trick and it worked perfectly.

Now, the probleme is that I can't get exactely the same result as the 3.6
version. Here my colors seem to be "washed out" (it's like everything is more
"grey" and less shiny than on the 3.6 version). I don't know what to do.

Any guess on that ?


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