Ok All,

I make futher investigations and find that megapov0.5 is ok!!

The code for the test is below (the gif file can be found in the
binaries-scene file group).

You just need to put different value for n. In Megapov0.5
the result is independant of n but not in Megapov0.4!
The thing which trouble me (and I don't understand yet
One can explain??) is that I need to put this kind of line 
in the subtexture : scale<1/100,1/100,1/30> for megapov0.5
but I DON'T need to change the scale of the substructure
if I change n!! So why I need to change scale one time
and after not!? I must use scale<1/100,1/100,1/30> because
the heightfield is scale by 2 by Moray and scale by
<50,50,15> by me. But after I scale again the heightfield
(scaling is multiply by n) But I don't need to change
the scale of the subtexture anymore, so I miss something
here??

#version Unofficial MegaPov 0.5;
#declare n=1;

global_settings {
  adc_bailout 0.003922
  ambient_light <1.0,1.0,1.0>
  assumed_gamma 1.9
  hf_gray_16 off
  irid_wavelength <0.247059,0.176471,0.137255>
  max_intersections 64
  max_trace_level 10
  number_of_waves 10
  radiosity {
    brightness       3.3
    count            100
    distance_maximum 0.0
    error_bound      0.4
    gray_threshold   0.5
    low_error_factor 0.8
    minimum_reuse    0.015
    nearest_count    6
    recursion_limit  1
  }
}

background { color <0.000,0.000,0.000> }

camera {  //  Camera StdCam
  location  <     -3.772,      12.256,      20.617>*n
  sky       <    0.00000,     0.00000,     1.00000> // Use right
handed-system 
  up        <        0.0,         0.0,         1.0> // Where Z is up
  right     <    1.37370,         0.0,         0.0> // Right Vector is
adjusted to compensate for spherical (Moray) vs. planar (POV-Ray) aspect
ratio
  angle         50.00000    // Vertical      37.500
  look_at   <     -3.063,      -7.569,      13.876>*n
}


light_source {   // Light1
  <0.0, 0.0, 0.0>
  color rgb <1.000, 1.000, 1.000>*1.8000
  translate  <-200.0, -200.0, 200.0>*n
}


object {   // HgtFld001
  height_field {
    tga "ile.tga"
    water_level 0.001
  }
  rotate    <-90, 0, 0> // Turn onto XY plane. Now points along -Z
  scale     <  2, 2,-2> // Scale to Cube size. Now points along +Z
  translate < -1,-1,-1> // Center around origin
   material  // Material1
   {   
      texture
      {
         material_map
         {
            gif   "ile_map.gif"
            texture
            {            
               pigment
               {
                  image_map
                  {
                     gif   "rock.gif"
                  }  
               scale 3 
               scale<1/100,1/100,1/30>   //comment this for
megapov0.4            
               }
            }
            texture
            {            
               pigment
               {
                  color rgb <1.0, 1.0, 1.0>
               }
            }
            texture
            {            
               pigment
               {
                  image_map
                  {
                     gif   "conc-f1.gif"
                  }
                  scale 3 
                  scale<1/100,1/100,1/30>  //comment this for megapov0.4
               }
            }
         }

         scale  <2.0, 2.0, 1.0>
         translate    <-1.0, -1.0, 0.0>
      }
   }
  scale <50.0, 50.0, 15.0>*n
  translate  14.98*z*n
}

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