Ger <No.### [at] thankyou> wrote:
> difference {
>         box{<-20,0,-0.1>,<20,2.5,0.1>}
>         box{<-0.75,0,-0.2>,<0.75,2.1,0.2>}
>         texture { MyWallTexture}
>         }
> That should do it

  Perhaps it would be a good idea to explain *why* it has to be done
that way, so that he will learn the principle and know the next time
what to do.

-- 
                                                          - Warp

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