[vtkusers] Rotate the camera

Max smapersmaper at gmail.com
Mon Dec 2 09:27:37 EST 2013

Hi Sun Tao,
Elevation is a tricky one, since after you rotate by more than 90 degrees,
it gets a problem with view up vector and changes the axes, and you get
something not intended.
I solved it by:
private void ElevateCamera(double angle)
            //5 is chosen since 360 / 5 < 90 and there is a problem with
angles bigger than 90
            double elevationPartialShift = angle / 5;
            for (int i = 0; i < 5; ++i)

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