POV-Ray: Newsgroups: povray.general: How to calculate the focal length?: Re: How to calculate the focal length?

POV-Ray : Newsgroups : povray.general : How to calculate the focal length? : Re: How to calculate the focal length?		Server Time 4 Aug 2024 16:14:28 EDT (-0400)

From: HermanS
Date: 29 Mar 2003 11:38:31
Message: <MPG.18efea74a47cc773989686@news.povray.org>

Andreas Kreisig wrote:..
> Hi!
> 
> POV-Ray uses the horizontal angle to determine the clipping. Does somebody 
> know how to calculate the focal length when only the horizontal angle is 
> given?
> 
> Regards,
> Andreas
> 
> 
I suppose that what you mean by "focal length" is the direction vector 
(the distance between the focal point and the screen). The relation 
between the horizontal angle and the focal length (direction) can be 
found in the PovRay Help section 6.4.1.

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