Anti-aliasing issues with Python VTK and Qt

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If the OpenGL context is being created by Qt, you might have to modify Qt’s default OpenGL pixel format before creating the widget. See https://doc.qt.io/qt-5/qglformat.html#setDefaultFormat

Here is some 100% untested code for you to try:

f = QGLFormat()
f.setSampleBuffers(True) # turn on antialiasing
QGLFormat.setDefaultFormat(f)
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