> function 1000,1000 {
> F_Terrain(x,y,z)
> }

This evaluates F_Terrain along the X-Y plane from <0,0,0> to <1,1,0>. Since
the cylinder goes along the y-axis (which ends up corresponding to the
z-axis in the height field), the height field only changes along the x-axis.

Two solutions:
 - rotate your cylindrical pattern to face along the z-axis with rotate 90*x
 - use the spherical pattern instead of cylindrical

 - Slime
 [ http://www.slimeland.com/ ]

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