one more correction, replace PX in the previous with:

#declare PX=pigment{  //Tile pattern x plane
      gradient x
      pigment_map{
        [  DimU/2 GrtCol]
        [  DimU/2 gradient y colour_map{[DimV/2 GrtCol][DimV/2 TilCol][1-DimV/2
TilCol][1-DimV/2 GrtCol]}]
        [1-DimU/2 gradient y colour_map{[DimV/2 GrtCol][DimV/2 TilCol][1-DimV/2
TilCol][1-DimV/2 GrtCol]}]
        [1-DimU/2 GrtCol]
      }
      scale <TilSiz.u/BSiz.z/4,TilSiz.v/BSiz.y/3>
}

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