John M. Dlugosz <joh### [at] dlugoszcom> wrote:
: Not really... a single circle going on forever is easy.  The metal is
: polished in one place making a swirl pattern, then polished in another spot,
: and another, etc. so the surface is covered with lots of circles, not one
: big one.

  Perhaps something like this then:

#declare Distance=5;
#declare Circles=20;
camera { location <0,10,-10>*1.5 look_at 0 angle 35 }
light_source { <100,100,-100> 1 }
plane
{ y,0
  pigment { rgb x }
  finish { specular .5 }
  #declare CirclesNormal=
    normal
    { spherical 2 slope_map
      { [0 <0,0>]
        [.5 <1,2>]
        [.5 <1,-2>]
        [1 <0,0>]
      }
      frequency Circles
      scale Distance*sqrt(2)/2
    }
  normal
  { average normal_map
    { [1 CirclesNormal]
      [1 CirclesNormal translate x*Distance]
      [1 CirclesNormal translate -x*Distance]
      [1 CirclesNormal translate z*Distance]
      [1 CirclesNormal translate -z*Distance]
    }
    translate x*Distance/2
    warp { repeat x*Distance }
    translate -x*Distance/2
    translate z*Distance/2
    warp { repeat z*Distance }
    translate -z*Distance/2
  }
}


-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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