Tika wrote:

> > 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

Here is an example of "differencing" one object from another as was
suggested before. Triangles may not work well for your application
because they have no thickness plus you cannot cut a hole through
the face of a triangle so modelling the hole would be a real problem.
While a plane may be ok for making a box I think you will be much
better off if you spend some time learning how to use the box object
instead. It is one of the most important objects in POV-Ray and if
you don't spend some time with the basics you will never get anywhere
with the program.

In this example the first box is the shell of the bird house, the second
box is used to hollow it out, and the cylinder is used to cut the hole
in the face of the house. I added a simple camera and light source so
that you can render it to see how effective it is.

camera{ location<-1.5,0,-5>look_at 0}
light_source {<-20,0,-50>rgb 1}

difference {
             box {  -1, 1 }
             box { -.9,.9 }
        cylinder { < 0, 0,-1.1>,<0,0,-.75>,.3}
          pigment{ rgb 1}
}

Enjoy,

-- 
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html

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