Win98, Athlon 1.4 GHz, 768 MB RAM,
POV-Ray for Windows 3.5

Buggy, just cyan as in initial demo-image.

--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde

> In my last image I came across a bug in the dispersion code that other
> people also seems to have found.
> I posted a small part of the image showing the bug in a message titled
> "Dispersion bug?" in p.b.i. I got an answer pointing me to the thread
"Lucy
> in the sky with diamonds". Reading it I found out that the bug is present
in
> the official win32 build and disappears if you recompile with MSVC. I
could
> not find any more information about the bug so I have started to make an
> investigation.
>
> I made a little test scene to see when the bug shows up.
> The source is posted in p.b.s-f and the results on my computer is posted
in
> p.b.i.
>
> The error that happens is that the red channel is missing from the image
at
> some places resulting in areas that are blue-cyan-green. The red is not
only
> missing from the refracted part but also from reflections and specular
> highlights.
> I think that the problem shows up when total internal reflection occurs
> because the error in the image is near the edge of the sphere.
> It seems it is only when you use despersion in combination with both
fresnel
> reflection and the conserve_enegry keyword that the bug is there.
>
> I would like that other people try my test scene and post the result here
so
> we can get a list of what versions have the bug.
>
> My system:
> PovRay 3.5 win32 official build, Windows XP SP1, Athlon XP 2400+ => Buggy
>
> --
> Daniel Nilsson
>
>

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