Wasn't it B. Gimeno who wrote:
>This one is an image made with an old version of pov-ray.
>
>The pigment is very simple.
>pigment {
>  checker
>    color 1
>    color 2
>    color 3
>    ...
>}
>
>How could be made TODAY this effect avoiding error messages?

box {-4.999,4.999
  pigment {
    function {(floor(x)+floor(y)+floor(z))/3}
    colour_map{
      [0/3 rgb x]
      [1/3 rgb y]
      [2/3 rgb z]
      [3/3 rgb x]
    }
  }
}


The .999's are there to prevent the colour changes happening exactly on
a face or edge, which cause the pigment equivalent of coincident
surfaces.

-- 
Mike Williams
Gentleman of Leisure

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