"thisroad" <nomail@nomail> wrote in message 
news:web.47b4fdb672c7bea14915bbf10@news.povray.org...
> Triple_R, thanks for the input!  I'll play around with that and see what
> happens.  It seems like there would be a simple way to create this --  
> maybe
> differencing this sphere with one that's marginally smaller would work.
>

If you want to see the two rings where the surfaces of the sphere and the 
cylinder touch you'll need to give them some thickness. Yes, you can do this 
for the sphere by differencing a smaller sphere. You can do the same for the 
cylinder by differencing it with another cylinder of a smaller radius.

intersection {
  difference {
    sphere {...}  // Big Sphere
    sphere {...}  // Smaller Sphere
  }
  difference {
    cylinder {...} // Big Cylinder
    cylinder {...} // Smaller Cylinder
  }
}

You shouldn't need the 'open' keyword on the cylinder.

Regards,
Chris B.

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