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

  function{
    abs(x)-2+y
  }
  contained_by { box { -2, 2 } }
  accuracy 0.003
  max_gradient 5

  texture{ pigment{ color rgbt<1,1,1,0.6>}
           finish { specular 0.1 phong 1}}
  scale 0.45
  rotate<0,-40,0>
  translate <0, 1.2, 0>
} // end of isosurface -----------------------------------------------------