Am 29.11.2010 23:53, schrieb KurtB:
> Hi,
>
> In developing my first POV-Ray scene I encountered a subtle artifact and I am
> not sure how to get rid of it. I have a 100% transmissive cylinder containing
> identically-transformed emissive media with a cylindrical distribution. When in
> front of a dark reflective texture, the edges of the cylinder appear dark (a
> little bit like a shadow, but obviously not a shadow). When in front of a
> brighter or flatter texture, the edges of the cylinder do not appear darker than
> the surroundings--the desired effect. This artifact seems a bit stronger when
> the cylinder is partially embedded in the dark-textured object. This image shows
> what I mean:
>
> http://www.freeimagehosting.net/image.php?923dd7c03e.png
>
> Could anyone suggest what causes this, and how I might get rid of it?

I don't see anything strange in that image. Are you sure it's not just a 
subtle optical illusion, or a peculiarity of your display?

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