isosurface { //----------------------------------------

  function{
   f_rounded_box( x*0.7, y, z,
                  0.3, // radius of curvature
                  0.8,0.8,0.8)// scale<x,y,z>
   -(f_crackle(x*3,y*5,z*3)*0.75)
   }
  threshold 0
  contained_by {box {<-1,-1,-1>*1.5,<1,1,1>*1.5}}
  max_gradient 3.2
  accuracy 0.0001

  texture { pigment{ color rgb<1.0,0.75,0.5>}
            normal { bumps 0.5 scale 0.015}
            finish { phong 0.3}
	  }
  scale 0.700
  rotate <0,-50,0>
  rotate <-20,0,0>  
  translate <-0, 1.4, -0.5>
} // end of isosurface ---------------------------------