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.

--John

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