[vtkusers] Point Smoothing

[meakcey]

Somehow any of PointSmoothing related functions did not work.
Finally that has resolved by adding glEnable(GL_POINT_SMOOTH) before
renderVTK();

Much better like below

...
actor->SetMapper(mapper)
renderer->AddActor(actor);

glEnable( GL_POINT_SMOOTH );
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
glPointSize( 2.0 );

renderVTK();



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