I am using Qt5 and experience exactly the same problem with QVTKWidget. Regards, Dave -- View this message in context: http://vtk.1045678.n5.nabble.com/QVTK-Widget-and-Retina-MacBook-High-DPI-screen-tp5739142p5739181.html Sent from the VTK - Users mailing list archive at Nabble.com.