// cylinder lens for axis distorted field of view
// 1 is vertical cylinder, fixed viewpoint
// 2 is horizontal cylinder, fixed viewpoint
// 3 is vertical cylinder, viewpoint moves along the cylinder's axis
// 4 is horizontal cylinder, viewpoint moves along the cylinder's axis
camera {
  cylinder 1            // types 1, 2 ,3, 4
  location <0,0,-1>     // position
  right x*5             // horizontal aspect or field of view
  up y*2                // vertical aspect or field of view
  look_at  <0,0,0>      // view
}