POV-Ray : Newsgroups : povray.beta-test : Possible bug w/ photons, reflection and multiple light sources : Re: Possible bug w/ photons, reflection and multiple light sources Server Time
30 Jul 2024 20:19:38 EDT (-0400)
  Re: Possible bug w/ photons, reflection and multiple light sources  
From: Nathan Kopp
Date: 3 Oct 2001 22:35:00
Message: <3bbbcad4@news.povray.org>
"Jari Juslin" <zds### [at] ikifi> wrote...
> I have encountered quite strange behaviour, when using photons specified
> with count, reflection and more than one light source with object
> consisting of intersection on bunch of planes. Code below is the
> simplest one I have managed to show the bug. Change the value of showBug
> to false to make see what I am expecting to see and true to see the odd
> behaviour, which looks like is multiplies intensity of colors at least
> by magnitude of five...

I'm not sure if the bug still exists... I wasn't able to get anything
strange to show up in my development version of POV 3.5 beta.  I did
make some minor photon changes recently... so you may want to be on the
lookout for the next beta.

However, please note that your object is unbound (is that the right word?),
which will cause problems for the estimate that "count" uses to set the
spacing.  If you place a manual bounding box on your object, it might work
better. Otherwise, stick with "spacing" when using photons on unbound
objects.

Also, it would be best to use autostop, especially if the object remains
unbound.

I was able to get expected results with the following photon settings:
    spacing 0.7/40
    autostop 0

-Nathan


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