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I think that it's a somewhat illusionary effect but is most likely related
to gamma correction. Some people have complained about similar 'problems'
with scattering media. It is caused by diffuse light bouncing off of the
glass being added to the transmitted light that comes through the glass.
Also, if the description of your material does not conserve energy (if
reflected light, including diffuse, phong, etc, plus transmitted light adds
up to more than 1.0) then you could run into problems like this.
There really shouldn't be any difference between MegaPov and the official
version, though.
-Nathan
Eric Freeman <eri### [at] datasync com> wrote...
> Hey all,
>
> I made a couple of images (see povray.binaries.images post of the same
name)
> showing an odd result of using transparency. The first image shows a
> transparent object (merge of a box and a cylinder... pigment {rgbf
> <0.9,0.9,0.9,0.9>}) on a plane. The second image is just like the first
> except it uses a spotlight instead of a point light. The problem is the
> plane (and green bar) in the distance... it is much more visible as seen
> thru the transparent object than it is on the sides of the image. I
> rendered it in official 3.1 and the effect was there, but to a much lesser
> extent. Is this a bug???
>
> Eric
> --------------------
> http://www.datasync.com/~ericfree
> --------------------
> "I don't like it, and I'm sorry I ever had anything to do with it."
> - Erwin Schrodinger talking about Quantum Mechanics.
>
>
>
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