[vtkusers] what's the difference between actor 's position and sphere 's center ?

[fearhope]

For further information,
I'm adding my codes. 

	// Get the actor pointer	
	vtkLODActor* actor = vtkLODActor::SafeDownCast (am_it->second); 

	vtkAlgorithm *algo =
actor->GetMapper()->GetInputConnection(0,0)->GetProducer();
        // Or, vtkAlgorithm *algo =
actor->GetMapper()->GetInput()->GetProducerPort()->GetProducer();
	vtkSphereSource *src = vtkSphereSource::SafeDownCast(algo);

	src->SetCenter((double)center.x, (double)center.y, (double)center.z);
	src->SetRadius(radius);
	src->Update();

	actor->GetProperty ()->SetColor (r, g, b);
	
	actor->GetProperty ()->BackfaceCullingOn ();
	actor->Modified(); 

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