In vtkTransform, there is a vtkTransform::RotateX However, the output of this is always 4x4: GetMatrix(vtkMatrix4x4 *m) Can we add a GetMatrix(vtkMatrix3x3 *m) that simply creates the upper left 3x3 block of the 4x4 m? Either this or add a RotateX() (and Y and Z) to vtkMatrix3x3 directly? Thoughts? David