"Bill Pragnell"  wrote in message
<web.4628e5fca1d76b2a731f01d10@news.povray.org>:
> Yes, to avoid coincident surfaces.

Of course!

> I suppose a better way of doing it would be to make the wine/glass curve
> match the glass inner surface exactly, and then scale the wine by
> <0.999,1,0.999> or something. Must remember that! :-)

Neither solution are satisfactory. For a long time, I think that PoV is
missing a way to cleanly deal with coincident surface: some declaration in
the scene that says "these surfaces are *meant* to be coincident, you must
handle them that way"

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