Warp <war### [at] tagpovrayorg> wrote:
>   I really can't believe nobody has answered this completely trivial problem.
>
>   Just add "inside_vector y" to your meshes.
>
> --
>                                                           - Warp

Thank you Warp, Stephen, et al.

I've used the "inside_vector y", and I've also replaced the need for some CSG by
doing the math (but that's okay - I like the math).

What I've drawn isn't up to the standard of things on this site, but if you're
interested (and, again, have any comments or suggestions) I've uploaded it to:

http://au.geocities.com/gjdolby/jpgs/ringprog.jpg

and here is the picture I wanted that brought me to POV Ray in the first place:

http://au.geocities.com/gjdolby/jpgs/rwg.jpg

-Graham

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