Problem in VTK 8.2 with defaultFormat() and QVTKOpenGLWidget on Windows 10/Intel

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Yes, I see this as well. You can refer to my issue QPainter::begin: Paint device returned engine == 0, type: 1. I added gif’s showing this exact problem.

This is independent of QVTKOpenGLWidget. In my example, I inherit from QWidget. I’m able to recreate the problem without using QVTKOpenGLWidget at all.

Since Qt4, all QWidget’s are double-buffered, and WA_PaintOnScreen was added for backwards-compatibility to allow setting a widget to use single buffering.

I believe the issue stems from how VTK interprets how Qt version >=4 renders. I think it is still interpreting that Qt is single-buffered by default.

My example was using the python vtkmodules/qt/QVTKRenderWindowInteractor and that interactor uses a native vtkWin32OpenGLRenderWindow on Windows by default. I also have an NVIDIA GPU, so my previous comment was wrong. My example is a different issue.