[vtkusers] Point Smoothing

[meakcey]

Hi
I am working on a point cloud renderer with Qt which OpenGLWidget has been
promoted as custom class and all VTK related codes are included. That seems
working stable.

When I rendered point cloud, they seems as square and so I tried to apply 
GetRenderWindow()->PointSmoothingOn();
in the beginning of the load events.

Points seems as circle till I resize or move the window.
How can I keep them always circle?





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