I've just created an isosurface object which is a flat block
with a random rippled surface, but there are what appears
to be a grid of creases running across the surface 1 unit
apart.

Is this a feature of the isosurface or f_noise3d() and is
there any way to avoid this ? (I have tried the different
noise generators, and changing the isosurface accuracy and
max_gradient).

Thanks,

Bernard

// example code
#include "functions.inc"

global_settings { noise_generator 2 }

light_source { <0,90,0> color rgb <1,1,1> }

camera {right <image_width/image_height,0,0> location y*7.5 look_at 0 }

isosurface
{
    function{y-f_noise3d(x,0,z)}
    max_gradient 2
    contained_by{ box{<-6,-1,-4>,<6,2,4>}}
    pigment { rgb <0.25,1,0> }
    finish {phong 0.28 phong_size 16}
}

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