[vtkusers] Thousands of Spheres slow down FPS evidently

[zlf]

sphere = vtkSphereSource::new ();
sphere->SetRadius(3);
sphere->SetRadius(0.5);
sphere->SetThetaResolution(6);
sphere->SetPhiResolution(6);

_sphereMapper = vtkPolyDataMapper::new();
_sphereMapper->SetInput(sphere->GetOutput());

sphereActor = vtkActor::new();
sphereActor->SetMapper(_sphereMapper);
aRender->AddActor(sphereActor);

I add two thousand sphere into renderer. Which slows down FPS evidently.
Actually, instead of sphere, I just need some on screen markers.

Any way to show thousands of markers without slows down FPS evidently.

Thanks

superZZ

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