[vtkusers] OpenGL fails to initialize for Windows 7, VTK 7.0

[Matthias Blaicher]

Hi all,

I've build VTK 7.0 for Python 3.5 and non-visual stuff works great.
However, as soon as I want to open an OpenGL context, I get errors. This
is on an Intel Graphics card. I do also have VTK 6.3 by Anaconda on
Python 2 an there everything works great.

Some screenshots are attached. The first error message is
> FvtkWin32OpenGLRenderWindow: failed to get valid pixel format.

Does anybody have an idea what I'm doing wrong?

Best,
Matthias
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