"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] fwicom...
> On Fri, 8 Feb 2002 15:04:33 -0500, Greg M. Johnson wrote:
> > // Consider the differences in this scene if you add fog.
> > // IMHO fog (rgb 0) should make everything darker, no?
>
> I'm not where I can look at what the results of this are and what you
> think they should be, but I was wondering if you get the same result
> if you put the media in a finite container.

Tried it here and got a bizzare effect, the background turned pure red when
fog is there.  However the fog works as expected.  Reason the red is a
strange thing to see is that neither media nor fog should be influencing the
background.
And yes, both plane or box used to check on that.  fog seems to be as I'd
expect, like I said, but it's the fog addition making the entire background
red.

Double-check shows it's actually only the lower half of the scene that turns
red, but even with all else white or colorless, regardless.  All that
factors is the use of fog or not, but if  fog_alt .00001 fog_offset .00001
is used things return to normal.

Keep in mind that the scattering media tends toward white while the ground
fog tends toward black, cancelling each other out somewhat.
Don't know if lack of the fog parameters could be considered a bug.  But
maybe Greg is seeing something altogether different there.

Still beta 10 here, not 11 yet.

bob h

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