/// I ended up doing this

#declare Frequency      = 9.0;
#declare Dispersion     = 2.0;
#declare Slice          = 0.1;       /// the actual thickness
#declare Radius         = 1.0;    /// is Slice/Radius

isosurface {
         function
          { (noise3d(x*Frequency,y*Frequency,z*Frequency))
           +((sqrt(x^2+y^2+z^2)/Radius)^Dispersion)
           &abs(z/Slice)
          }
               accuracy 0.01
               threshold 1.0
               sign 1
               bounded_by {
               sphere{0, 1}
               }
        pigment{rgb 1}
        }

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