> The other thing you could do is add/subtract a scaled bumps/spotted pigment as
> part of your heightfield function to get an actual physical displacement.
>
> #declare Plain = function {f_ridged_mf(x,y,z, 2.3, 7.0, 5.0, -2, 1, 3.0) }
> #declare Grass = function {pigment {bumps}
> #declare GrassHeight = 10;
> #declare PlainAndGrass = function {Plain (x, y, z, ....) + Grass (x, y,
> z)*GrassHeight}
>
> height_field {function 100, 200 { PlainAndGrass (....)} ....
>
> Hope that makes sense.
>
> - BW

I tried to do this,

#declare Plain = function {f_ridged_mf(x,y,z, 2.3, 7.0, 5.0, -2, 1, 3.0) }
#declare Grass = function {pigment {bumps}
#declare GrassHeight = 10;
#declare PlainAndGrass = function {Plain (x, y, z, 2.3, 7.0, 5.0, -2, 1, 3.0) +
Grass (x, y,z)*GrassHeight}


height_field {
   function 100, 200 {PlainAndGrass (x,y,z, 2.3, 7.0, 5.0, -2, 1, 3.0) }
   smooth
   scale <1000, 100, 1300>
    pigment {
       color rgb <0.3, 0.5, 0.0>
    }
    translate <-500, -120, -1000>
}

but I have a error in
Grass (x, y,z)*GrassHeight}

"Expected '.', * found instead"

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