[vtkusers] QVTK Widget odd behavior on Ubuntu 16.10 and NVidia GPU:

[Utkarsh Ayachit]

>
> I recompiled VTK beforehand with the -DVTK_RENDERING_BACKEND:
> STRING=OpenGL2
> flag. Is OpenGL3 a thing?
>

No,  VTK_RENDERING_BACKEND:STRING=OpenGL2 is indeed what you want.

Also make sure before you create the QApp in your main, you're calling
`QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat())`. Is
that the case?
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