Hello, I got rid of the warning by adding the following line: VTK_MODULE_INIT(vtkInteractionStyle) -- View this message in context: http://vtk.1045678.n5.nabble.com/correct-way-of-using-VTK-MODULE-INIT-with-opengl2-tp5728129p5728199.html Sent from the VTK - Users mailing list archive at Nabble.com.