POV-Zhstar wrote:
> I use the camera by setting the keyword ‘angle’ of 25 d
egrees, and generate a
> scene by POV-Ray. Because the field of view of the camera is 25 degrees
 and
> POV-Ray uses the reverse ray tracing (rays are sent backwards from the 
camera to
> the light source), then I thought the output scene should be a circle f
or this
> case (camera vertically sees the object plane), ellipse otherwise. But 
the
> POV-Ray output an image of rectangle in shape. I can’t understa
nd why it is like
> this. Could someone explain the reason? Thanks!
> 
	I'm not sure why you would expect it to be circular or elliptic.
There is a drawing explaining the camera field of view and the
camera parameters on this page:
http://povray.org/documentation/view/3.6.1/246/

		Jerome
-- 
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