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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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