> Given a photograph for a background "plate", I want to render an object 
> in POV that will be composed into the photo.  So, I need to make the 
> camera position and perspective match the photo.
> 
> Given a square of a known size in the x-z plane visible in the photo, 
> supposing one corner of the square is the origin, has anyone already 
> made a script or spreadsheet or something to figure it out?  That is, 
> given the length of the two sides and the angle between them, calculate 
> the camera position.
You should have a look at :

http://www.univie.ac.at/Luftbildarchiv/wgv/intro.htm

-- 
:wq
Court-Jus

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