[vtkusers] VTK 8.0.0 OpenGL2 Invisible surfaces

[Taron]

Hi there,

I have found a strange thing switching to the new Backend OpenGL2. When I
render surfaces it seems that only one side of a face is rendered and the
other is not. Front & Backface-Culling is off for those Actors.
This worked perfectly fine with the old Backend. Strangely enough when I
turn on Depth-Peeling in the renderer the faces are rendered correctly,
although none of the actors has any transparency set to it.
It is not driver related because I can reproduce this behaviour with mesa
drivers as well.
Everything takes place under Windows 10. It is an x64 Qt (5.9) app and im
using the QVTKWidget.
I also tried the QVTKOpenGLWidget, but it has the same issues.

Any hints what goes wrong here?





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