Hello,
 
How can I get rid of the " blocky" appearance of the heightfield
foreground surface,and get a smooth mountain surface in the foreground?
The heightfield  is made in GeoFrac2000.
 
This is the code in Pov-Ray 3.5:
 
#include "colors.inc"
#include "textures.inc"  
 

camera{
    location <0, 1, -10>
    look_at 0
    angle 30
  }
 
  light_source{ <1000,600,-1000> White }
  light_source{ <1000,600,-1000> White }
 

height_field {
    tga "Mountain.tga"
    smooth
    pigment { White }
    translate <-.5, -.5, -.5>
    scale <17, 1.75, 17>
  }
 
sky_sphere { pigment { gradient <0,1,0>
         &n bsp;           &nb sp; color_map { [0.00 rgb <1.0,1.0,1.0>]
        & nbsp;           &n bsp;           &nb sp;  [0.30 rgb <0.0,0.1,1.0>]
        & nbsp;           &n bsp;           &nb sp;  [0.70 rgb <0.0,0.1,1.0>]
        & nbsp;           &n bsp;           &nb sp;  [1.00 rgb <1.0,1.0,1.0>]
           &nb sp;           &nbs p;         }
           &nb sp;           scale 2        
           &nb sp;         } // end of pigment
           } //end of skysphere
 
Thanks,
 
H.Frik