3ed026bb@news.povray.org...
> Or how can I get a background fog that's only in the background and
doesn't
> interact with the foreground?

Do you use turbulent fog ? It's known to cause problems with media.
Otherwise you can try using a fog that points to -z instead of up.
fog{
    fog_type 2
    fog_alt 10
    distance 30
    rgb 1
    up -z
}
The trick is useful to get a very foggy and close background (starting at
z=-fog_alt I presume) with a clear foreground. No guarantee it's going to
solve your problem though, and of course it's no longer a ground fog...

G.
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