[vtkusers] calibrate vtk camera

[Laurent Chauvin]

Hello vtkusers,

I'm trying to calibration a vtk camera so it has the same properties and
deformation as my real camera.
I used OpenCV to do the camera calibration and obtain the intrinsic
parameters.

I applied the focal distance to the vtk camera and the view angle, but now
I'm wondering how to apply the principal point (optical center) to the vtk
camera.

I saw there were some topics about it, but none of them really gave a clear
answer.

Thank you.
-Laurent
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