I'm using a 500x500 pixel .png to make a heightfield as a basis for a
landscape I'm creating.  The trouble is, the coloration is all patchy in
places.  This is not the regular problem of the normal flipping that can be
solved by double-illuminate, and it has nothing to do with my texture map,
since all I'm using is a green pigment (for right now, anyway).  I've
searched these newsgroups, and the responses I've seen all mention using
smaller heightmaps.  So I cut it down to 4 maps of half size, 250x250.  But
the scene still looks exactly the same, except now I have ugly seams where
the heightfields join up.

Could I be using double-illuminate wrongly? Any other ideas?

//the scene file:
camera{
   location <450,120,-450>
   look_at <0,-50,0>
}



/*
camera{
   location <40,1300,-45>
   look_at <0,75,0>
} */
light_source{
   <2000,2000,-2000> color White
}

sky_sphere {
   pigment {
      gradient y
      color_map{
         [ 0.0     rgb <0.180392, 0.4, 0.913725> ]
         [ 1.0     rgb <0.541176, 0.74902, 1.0> ]
      }
      scale .4
      translate .7
   }
}

fog {
    distance 1000
    color rgbt<0.541176, 0.74902, 1.0,.35>
  }

#declare Terrain=
union{
height_field{
   png "HMap.png"     //this is the main heightfield
   double_illuminate   // I've stuck this in elsewhere, but with no luck.
   smooth on
   water_level 0
   pigment{color rgb<0,.7,0> }
   finish{ambient .3}

}
height_field{
   png "HMap2.png"   //this is just background
  // smooth on
   water_level 0
   pigment{color rgb<0,.7,0>}
   finish{ambient .3}
   translate<-1,0,0>
}
height_field{         //this is just background
   png "HMap3.png"
  // smooth on
   water_level 0
   pigment{color rgb<0,.7,0>}
   finish{ambient .3}
   translate<0,0,1>
}
height_field{         //this is just background
   png "HMap4.png"
  // smooth on
   water_level 0
   pigment{color rgb<0,.7,0>}
   finish{ambient .3}
   translate<-1,0,1>

}
}
object{
   Terrain
   scale <1000,100,1000>//scale <1000,150,1000>
   translate <-500,0,-500>
   rotate<0,0,0>
}

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