The actors are loaded with data from STL/OBJ files only once, but the transform like rotation are make the actors to change every time the loop is run. -- View this message in context: http://vtk.1045678.n5.nabble.com/Control-VTK-frame-rate-tp5743876p5743889.html Sent from the VTK - Users mailing list archive at Nabble.com.