'hollow' and 'inverse' are two possible solutions.  If you have both media and
fog in the scene there might be nothing you can do to completely fix it though.
There's always been troubles for the combination of fog and transparent
container objects.  Sometimes you can adjust the pigment of the containers to
mask them more but it's not perfect at all.  Increasing the filter or transmit
(or combination of both) by a slight bit over 1 can help.
Anyway, there's that difficulty.  If you get no media or fog on just one side of
the disc then go with hollow and maybe inverse (or just flip the disc 180
degrees).

Bob

"Abe" <bul### [at] taconicnet> wrote in message
news:38815E78.35B88272@taconic.net...
> Perhaps someone could clear this up for me. I'm trying to generate a
> scene with a partially transparent object (a lens flare disc). The
> problem is that while all other objects appear visible through the
> transparent object, media and fog don't. Are there some special
> considerations which I'm maybe not taking into account...or what?

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