Granted, I don't realy know about isosufaces but copied an example from the 
tutorials, but with the following code I don't get a sphere but a perfectly 
smooth cube

// Test code

#version 3.7;

#include "colors.inc"
#include "functions.inc"



light_source {< -400, 1000, -500>, color 1.0  }


global_settings {
    ambient_light 0
    noise_generator 3
    assumed_gamma 1.0
    }



#declare SimpleBlock =
isosurface{
function {
  f_sphere( x, y, z, 2.6) -
    f_noise3d( x, y, z ) * 0.5
    }}


object { SimpleBlock pigment { red 0.5 }}

plane { y, -25 pigment { Gray50 }}

camera {
  location <2, 1.5, -6>
  look_at 0
  direction z *   1.0
  right image_width / image_height * x
}

// End code

Most likely I'm doing something wrong. but fail to see what.
Any hints appreciated.

Running povray 3.7.0 RC7 on opensuse 12.3
-- 
Ger

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