In example:
http://www.f-lohmueller.de/pov_tut/tex/tex_651e.htm
#declare fn_Pigment_1 =
function {pigment{ Pigment_1} }

isosurface { //----------------------------
  function{
    f_rounded_box(
        x,y,z,
        0.15, // radius of curvature
        1.5, 1.0, 1.625  // scale<x,y,z>
                 ) //
     - fn_Pigment_1(x,y,z).gray*0.25
  } // end function
  threshold 0
  contained_by {box {<-2,-2,-3>,<2,2,3.5>}}
  max_gradient 6
  accuracy 0.0001
  texture{
     pigment{ Pigment_1 }
     normal { crackle 0.5 scale 0.045}
     finish { phong 1}
   } // end texture
  translate <0.5, 1.1, 0.375>
} // end of isosurface --------------------

http://www.f-lohmueller.de/pov_tut/tex/im/pattern_crackle_isosurface_4i.htm

My file:
#version 3.7;
#include "functions.inc"
global_settings {
    assumed_gamma 1.0
    max_trace_level 3
}
background {rgbt<0.0509, 0.0509, 0.0509, 0>}
#declare Material_tex = texture {pigment{rgb 0.8}}

#declare Pigment_1 =   //------------------
pigment{ crackle
         turbulence 0.25 scale 0.1
         color_map{
          [0.00 color rgb<1,1,1>*0]
          [0.08 color rgb<1,1,1>*0]
          [0.40 color rgb<1,0.55,0>]
          [1.00 color rgb 1]
         } // end of color_map
} // end of pigment -----------------------

#declare fn_Pigment_1 =
function {pigment{ Pigment_1} }

isosurface{ //-------------------------
  function {
(f_devils_curve(x*x,y,z, 10) * f_cubic_saddle(x,y,z, 1)) -
fn_Pigment_1(x,y,z).gray
  }
  //contained_by{ sphere{<0,0,0>, 1} }
  contained_by{ box{-1, 1} }
  accuracy 0.03
  max_gradient 1500

  texture{ pigment{ Pigment_1}}
  scale <1,1,1>*2
  rotate <0,-20,0>
  translate <0,0,0>
} // end of isosurface ----------------



light_source {
    <8.95,5.9,9.18>
    color rgb<1, 1, 1>
}
camera {
    location  <0, 0, 0>
    look_at  <0, 0, -1>
    right <-1.6077777759896383, 0, 0>
    up <0, 1, 0>
    angle  49.134343
    rotate  <-27.098163, 46.688390, -0.903519>
    translate <7.481132, 5.343666, 6.507640>
}

Not all in contained_by { box {-1, 1} } it is subtracted
Below on the right there was a smooth surface
Though, very beautiful stone turned out
I will make available manipulation with similar objects in Blender3d. It is very
valuable to creation of an interesting scene, for example, ancient architecture
or a fantasy. Very good! :)

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