// 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, 1, -5 >  // 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
}
