"triple_r" <rre### [at] hotmailcom> wrote:
> camera{location <1,3,3> look_at 0}
> light_source{<25,25,25> rgb 1}
> difference{
>  difference{
>   sphere{0,1}
>   sphere{0,.95}
>  }
>  cylinder{0,y*2,0.3}
>  plane{-z,0}
>  pigment{rgb 1}
> }
>

This works, but the extra difference is unnecessary, everything after the
first object in a difference is differenced from it:

difference{
  sphere{0,1}
  sphere{0,.95}
  cylinder{0,y*2,0.3}
  plane{-z,0}
  pigment{rgb 1}
}

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