[vtkusers] How to get current view vector and model view matrix of the scene

[Jana Sefcikova]

Thank you Jochen for your complex and clear answer.
The second option is what I was looking for. 'View' vector is direction of
projection.
I tried it and I have little problem to pass it to vtkPolyData but I will
create for it separate thread.

Have a nice day.
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