As Mike Williams was kind enough to point out:
>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>
>    }
>  }
>}

Now the only problem is that I'm at work and can't play around with this
until I get home.  But it sounds like you've hit on exactly what I need!

Thanks so much for the quick response--I'll post again tomorrow with an
update on my progress.

Dave!

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