"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3df52a07$1@news.povray.org>,
>  "TinCanMan" <Tin### [at] hotmailcom> wrote:
>
> > +two planes differenced if you want true smooth surfaces and no
coincidient
> > surfaces.
>
> I don't think the coincident surfaces are a problem here...though one
> surface will sometimes be hit before the other, they both have the same
> normal and texture, it shouldn't be a problem. (at least, I've never had
> a problem with this situation)

I suppose you are right here, but you run into problems if you want to
difference this shape from another one for whatever reason.  I just always
avoid coincident surfaces as a rule just to be safe.

-tgq

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