Hello, i have following question. How can i use 3x3-transformations with vtk? I see homogeneous transformations with e.g. vtkMatrix4x4. But how can i use direct 3x3 matrices + vector , or 3 (3D)-vectors? Thank you very much, Gabriella Machen Sie Yahoo! zu Ihrer Startseite. Los geht's: http://de.yahoo.com/set