I got derailed last night, but did not forget.

Tested, working code:


#version 3.8;
global_settings {
 assumed_gamma 1.0
}

#include "functions.inc"

#declare E = 0.00001;


#declare Location = <0, 500, -1000>;
camera {
 location Location
 right x*image_width/image_height
 up y
 look_at <0, 0, 0>
}


sky_sphere {pigment {rgb 1}}

light_source {<3000, 2000, -2000> rgb 1}
sky_sphere {pigment {rgb 1}}

#declare Line = 0.01;

#declare E = 0.0000001;

#declare Plain = function (x, y, z, P0, P1, P2, P3, P4, P5) {f_ridged_mf (x,y,z,
P0, P1, P2, P3, P4, P5) }
#declare Grass = function {pigment {bumps}}
#declare GrassHeight = 10;
#declare PlainAndGrass = function (x, y, z, P0, P1, P2, P3, P4, P5) {Plain (x,
y, z, P0, P1, P2, P3, P4, P5) +
Grass (x, y,z).red*GrassHeight}


height_field {
   function 1000, 2000 {PlainAndGrass (x,y,z, 2.3, 7.0, 5.0, -2, 1, 3.0) }
   smooth
    pigment {
       color rgb <0.3, 0.5, 0.0>
    }
    translate <-0.5, 0, -0.5>
    scale <1000, 100, 1300>
}

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