This is a supplement to the image at the top of:
https://www.povray.org/documentation/view/3.6.1/246/
As this is a quick 'n' dirty illustration to answer a question, it's very basic,
and only works properly with an axis-aligned camera location.
Future work would make any combination of camera parameters acceptable, give a
nice, documentation-friendly render, and have much prettier text. :P
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Preview of image 'camera angle equation.png'
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