isosurface { //-------------------------------------------------------------
  function{
    f_mesh1(
       x,y,z,
       0.45, // distance between neighboring threads in the x direction,
       0.30, // distance between neighboring threads in the z direction,
       0.15, // relative thickness in the x and z directions,
       0.05, // amplitude of the weaving effect,
       0.25  // relative thickness in the y direction
    )
  }          
 contained_by {box {<-1,-1,-1>,<1,1,1>}}
 threshold 0.01
 max_gradient 8
 
 texture{ pigment{ color rgb <0.65,0.45,0.25>} 
          normal { bumps 0.15 scale 0.015}
          finish { specular 0.2 phong 0.7 }
           }
 rotate<-45,0,0>
 scale 1.25
 translate< 0,1.5,0>
} // end of isosurface -------------------------------------------------------