Still not sure to fully understand what you need, but would something like
this work ?
(To be used with the superpatch of course)
camera{location  -z*10  look_at   0}
plane{ z,0
  texture {pigment {crackle      form x      frequency 3
      color_map{[0 color <1,0,0>][0.25 color <1,1,0>][0.5 color rgb
0][0.75 color <0,0,1>][1 color <0,1,0>]}         }
    finish{ambient 1 diffuse 0}
  }
}

G.

Margus Ramst wrote:

> The latter.
>
> Margus
>
> Peter Popov wrote:
> >
> > Concetric in what manner? Sharing a common vertex and concentric in
> > terms of angle, or sharing a common angle and concentric in terms of
> > vertex and base?
> >
> > Peter Popov
> > ICQ: 15002700

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