[ptx] the FOV compute

[marc.torz at voila.fr]

Hi !
I am new on your forum, and I'm trying to understand how Hugin is done...
I wonder how is computed the automatic FOV when you push "Calculate Field of View"...
But the function Panorama::calcFOV() in Panorama.cpp is quite not clear ...

I don't understand how you proceed ... Is there any documentation about the automatic field of view compute ?

Thank you.
Marc.
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