See the attached include file and these threads:

From: Bald Eagle
Subject: Calculating visible camera area
Date: 25 Oct 2016 16:45:00
Newsgroup: povray.advanced-users
http://news.povray.org/povray.advanced-users/thread/%3Cweb.580f8b048d6e3073b488d9aa0%40news.povray.org%3E/

From: Tor Olav Kristensen
Subject: What cameras can and cannot see - 2 attachments
Date: 19 Feb 2003 16:38:32
Newsgroup: povray.binaries.images
http://news.povray.org/povray.binaries.images/thread/%3CXns9327B41C265F5torolavk%40204.213.191.226%3E

From: Tor Olav Kristensen
Subject: Camera macros
Date: 22 Jan 2003 23:11:26
Newsgroup: povray.general
http://news.povray.org/povray.general/thread/%3CX### [at] 204213191226%3E/

--
Tor Olav
http://subcube.com

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Attachments:
Download 'camera20.inc.txt' (55 KB)