Tika wrote:
> 
> Jerome M. BERGER <jbe### [at] enstfr> wrote in message
> news:37F95350.975D0136@enst.fr...
> 
> > Bob Hughes wrote:
> >> Btw, please don't put a black 'disc' on there for the openings, okay?  : )
> 
> > OTOH you could difference a box inside: right now it looks like a solid
> > box with a circular hole rather than an empty box with a circular
> > opening...
> 
> Oh, NOW I see what you're saying... I think instead of the cube I made up in
> sPatch, I will use some planes to make a hollow box intead. That'll be
> tricky - not sure if POV-Ray has square surfaces that can be put together.
> 
> --
> 
> Tika
> 
> Tika's Graphics: http://www.5thpower.com/tika/

	I'm not sure planes would do what you want: plane are actually solid
object, not surfaces, in POV: one side is "inside" and the other is
"outside" so if you difference a cylinder from a plane you won't get a
hole that allows you to see what's on the other side, but you'll get the
same kind of hole you already have with your box. I believe the easiest
way to get what you want is to difference a slightly smaller box from
the birdhouse:

difference {
  box { -1, 1 }
  box { -0.9, 0.9 }
  cylinder { 0, x, 0.3 }
  pigment { color Yellow }
}

		Jerome

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