light_source { x, rgb 1 }
isosurface {
   function { x*x + y*y + z*z + sin(4*x) + sin(4*y) + sin(4*z)-1}
   contained_by { sphere { 0, 4 } }
   max_gradient 25
   pigment { color rgb <0.8,0.8,1> }
   normal { bumps 1 }
   finish { reflection 1 ambient 0.1 diffuse 0.1 }
   rotate 45*z 
   rotate -126*x 
   translate 3*z
}