global_settings { hf_gray_16 }  //outputs a special format on 16 bits among 24 (uses red and green channels) see documentation

#include "colors.inc"


// orthographic projection using parallel camera rays
// used to render a planar image map
camera {
  orthographic
  location <0,10,0>    // position & direction of view
  look_at  <0,0,0>
  right 1.5*x            // horizontal size of view
  up 1.5*y               // vertical size of view
}

plane {y,0
 //1st texture to create light spots>>> small rocks
 texture{
 pigment{bozo
  color_map{
   [.7 White*.8]
   [1 White]
   }
   cubic_wave
  scale .01}
  finish{ambient 1 diffuse 0}
 } 
// 2nd semi-transparent texture to give a general curved shape to the height_field 
 texture{
 pigment{cylindrical
  color_map{
   [0 Black]
   [1 Black transmit 1]
   }
    cubic_wave     
  }
  finish{ambient 1 diffuse 0}  //no need of light for this use
 }
}