    Under many circumstances just two vectors in the camera statement are all
 you need: location and look_at.  For example:
       camera {
          location <3, 5, -10>
          look_at <0, 2, 1>
       }

    The location is simply the X, Y, Z coordinates of the camera.  The camera
 can be located anywhere in the ray tracing universe.  The default location
 is <0,0,0>.  The look_at vector tells POV-Ray to pan and tilt the camera
 until it is looking at the specified X, Y, Z coordinate.  By default the
 camera looks at a point one unit in the +Z direction from the location.

    The look_at specification should almost always be the LAST item in the
 camera statement.  If other camera items are placed after the look_at vector
 then the camera may not continue to look at the specified point.
