isosurface { //----------------------------------------------------
  
  function{ 
   sqrt( x*x + y*y + z*z) - 1 
   - f_noise3d( x*1.5, y*1.5, z*1.5 )*0.65
  }
  contained_by { box { -2.5, 2.5 } }
  accuracy 0.002
  max_gradient 4

  texture{ T_Stone3
           normal { crackle 3 scale <0.25,0.5,0.25> turbulence 0.3}
           finish { specular 0.3 phong 0.5}}
  scale 0.8
  rotate<0,0,0> 
  translate <0,1.2,0> 
} //---------------------------------------------------------------