Here's a modification of Daniel's code.  Why is there a distortion in x but
not z??


#include "colors.inc"

#include "functions.inc"

camera
{
 location <0, 2, -10>
 rotate 90*y
}



light_source
{
 <-100, 100, -100>
 color White
}


#declare f_hills =
function
{
 pattern
 {
  bumps

  scale <0.1, 0.1, 0.1>
 }
}

#declare blah=10;
#declare f_hills2=function{f_noise_generator(x,y,z,2)}


height_field
{
 // Incease your resolution here if you need to.
 function 256, 256 { f_hills2(x*blah, y, z*blah) }
 smooth

 pigment
 {
  color rgb <1, 1, 0.8>
 }

 translate <-0.5, 0, -0.5>
 scale <10, 0.5, 10>
}

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