// normal perturbed camera
camera
{
  location  < 0, 1, -5 >                // position
  look_at   < 0, 0, 0 >                 // view
  right     x*image_width/image_height  // aspect
  normal                                // normal
  {
   wrinkles 0.2 scale 0.3               // pattern
  }
}
