Hello, I don't know where to post this but I just thought I'd point out a bug in the Java example code listed here: http://www.vtk.org/VTK/help/examplecode.html There needs to be a call to iren.Initialize before the the call to iren.Start for all the examples. I don't know if this is a change for 5.6 or not. Cheers, -- *Paul Gotzel*