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The optional normal may be used to assign a normal pattern to the camera.  For example:
 camera{
   location Here
   look_at There
   normal{bumps 0.5}
 }
All camera rays will be perturbed using this pattern. The image will be distorted as though you were looking through bumpy glass or seeing a reflection off of a bumpy surface.  This lets you create special effects. See the animated scene camera2.pov for an example.  See "Normal" for information on normal patterns.
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