Hi David, this is a part from my code: for (int i=1 ; i<10;i++) { vtkSmartPointer<vtkSphereSource> sphere = vtkSmartPointer<vtkSphereSource>::New(); sphere->SetRadius(i); sphere->Update(); } -- View this message in context: http://vtk.1045678.n5.nabble.com/moving-actor-tp4895490p4895577.html Sent from the VTK - Users mailing list archive at Nabble.com.