From: Warp <war### [at] tagpovrayorg>
Date: 21 Feb 2005 10:13:38 -0500

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  The spherical camera seems to behave inconsistently compared to
other camera types.
  The issue seems that 'right' and 'up' do not affect the spherical
camera in any way, and a negative direction seems to turn the
spherical camera upside down, unlike any other camera type.
  This simple scene demonstrates this:

camera
{ spherical
  //fisheye
  direction -z
}

plane
{ y, -1
  pigment { checker rgb 1, rgb .5 }
  finish { ambient 1 }
}

  If you compare it to a perspective or fisheye (or any other) camera
you'll see that the behaviour of the spherical camera is not
consistent with those.

  While the spherical camera probably could benefit from some further
developement (to make it more consistent with the other camera types),
the documenation should probably be more specific on how the spherical
camera works and how the different camera parameters affect (or don't
affect) it.

  Tested in WinPOV 3.6.1, but probably is the same thing in all
POV-Ray versions with spherical camera support.

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