Mike Williams suggested that I:

>Take a look at the "object" pattern. It allows a surface to have a
>different texture wherever it intersects a second invisible object. Your
>thingie can be coded like this:
>
>#declare thingie = sphere {<0,0,0>,15
>  pigment {
>    object {
>      cylinder {<-4,0,-20>,<-4,0,-10>,4}
>      rgb <1,1,1>
>      rgb <.6,.6,.8>
>    }
>  }
>}

Yes indeed!  That was exactly what I was looking for.  You'll save me
approximately a zillion hours in code-time.

Thanks once again.

Dave!

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