"Patrick Hagerty" <pat### [at] daeoriaorg> wrote in message 
news:43655054.BFA2ECB2@daeoria.org...
> OK.  I tried it.  It worked.
>
> I was simply failing to think in three dimensions.  A plane is two 
> dimensional,
> a box is three dimensional.  That's what I get for doing most of my 
> POV-Ray
> work in the evening after a day of mind numbing work.
>
> Thanks again.

Hello Pat,

Not meaning to be a pain, and it doesn't impact your gem solution, but just 
to explain pedantically in order to be safe...  In PovRay's Constructive 
Solid Geometry, a plane is considered a 3-Dimensional object - ie. like a 
box, the plane has an inside and an outside, except the inside of a plane 
extends infinitely.  A triangle or polygon, however is two-dimensional - it 
has no inside nor outside.

If you invert the normal of the plane, eg, from y to -y, the plane will look 
identical, however "inside" and "outside" are reversed.  This will make a 
big difference to the behaviour of unions, intersections and differences. 
It also impacts on media.

Cheers,
   Brian

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