[vtkusers] 3D Rendering rotation issue with Opacity

[Mikhail Pukhlikov]

Hello there!

We're using VTK for medical imaging but there is long standing issue we can't understand so far
When 3D opacity is around 0.8 rotation gives some very strange mirror effect when near part is becoming invisible (very transparent)
There is issue demonstration: https://drive.google.com/file/d/0B-Ae8luypUS0UTdTNjd6a1hoS2M/view

I had opened an issue there: https://gitlab.kitware.com/vtk/vtk/issues/16950

Thank you,
Mikhail
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