This is the code (and my problem)  :-(

sky_sphere {pigment {gradient y color_map { [0.0 color rgb <0.7,0.7,1.0>]
[1.0 color blue 0.5]}}}

light_source {<400.0, 700.0, -200.0>1.0}

camera {location <0.0, 1.0, -5.0> look_at <0.0, 0.4, 0.0>}

#declare f1 = function {pattern {bozo scale 2.0 turbulence 0.5 scale 0.1}}

isosurface {function{y - f1(x, y, z)*0.2}
        accuracy 0.0001
        max_gradient 3.0
        pigment {rgb <0.8, 0.8, 0.75>}
        scale <10.0, 10.0, 10.0>
        translate -y*2.0
        }

How can I make it a (pseudo) infinite plane (terrain...) without loss of
quality due to the pattern scalling (if I scale the isosurface, the pattern
functions is scalled to...)
I just want to make terrains like Christoph Hormann does ("The landscape of
the week")
Thanks.

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