"Dave VanHorn" <mic### [at] gmailcom> wrote:
> I'm a little stuck with this..
>  I'm trying to define a realistic plastic hemisphere.
>
>  In other words, define a sphere with actual wall thickness, so that when I
> clip it with a plane, or cylinder (as drilling a hole in it) the edges show
> up, and it dosen't end up as two infinitely thin shells.
>
> What CSG should I use for this?

I don't know that it's the most efficient way possible, but this sounds like
what you are talking about:

camera{location <1,3,3> look_at 0}
light_source{<25,25,25> rgb 1}
difference{
 difference{
  sphere{0,1}
  sphere{0,.95}
 }
 cylinder{0,y*2,0.3}
 plane{-z,0}
 pigment{rgb 1}
}


If you replace plane{-z,0} by clipped_by{plane{z,0}}, then it does give two
shells.  I had to look it up to remember, but the manual explains that
clipped_by removes surfaces and leaves an opening.

http://www.povray.org/documentation/view/3.6.1/322/

 - Ricky

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