The ground pattern for the radiosity text images.
It's made of two orthogonal gradient patterns which are
placed on the black and white fields of the checker patter
respectively.
With brighter colors with some more yellow in it it makes a nice
weaved paper or weaved wood pattern.
I sometimes use it as a replacement for the standard checker board.

The texture statement looks like this.

texture {
 pigment {
  checker
  pigment { gradient x
   color_map {
    [0.0 rgb 0][0.1 rgb 0.05]
    [0.1 rgb <1/2,1/2,1/2>][0.9 rgb <1/2,1/2,1/2>]
    [0.9 rgb 0][1.0 rgb 0.05]
   }
  }
  pigment { gradient z
   color_map {
    [0.0 rgb 0][0.1 rgb 0.05]
    [0.1 rgb <1/4,1/4,1/4>][0.9 rgb <1/4,1/4,1/4>]
    [0.9 rgb 0][1.0 rgb 0.05]
   }
  }
 }
 finish { ambient 0 diffuse 1 }
}

Sebastian

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