> Not exactly anything significant. However, I tried again with a
>         photons {
>                 collect off
>                 }
> added to only the union of that cylinder pair which is differenced from
the
> remainder cylinder and the render time increased 8 fold.

That's not very encouraging.  Have you tried it with MegaPOV?  It rips right
through the scene when I try it here.

> I stopped there because I couldn't figure the logic in your CSG creation.
> :-)

I had to think about it for a moment myself.  It makes sense when you give
the two parts different textures.
The union cuts away the inside and outside of the first cylinder.

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