MRP Orientation and setting camera roll issue

Support
6

Sounds good. Here is a snippet of how I am applying the roll. I am happy to provide any more info.

       # viewerXY and viewerYZ are instances of vtkResliceImageViewer

        # define viewers
        [self.viewerXY, self.viewerYZ, self.viewerXZ] = [
            vtk.vtkResliceImageViewer() for x in range(3)
        ]

        cam_xy = self.viewerXY.GetRenderer().GetActiveCamera()
        cam_xy.Roll(180) # <---- This doesn't work
        cam_yz = self.viewerYZ.GetRenderer().GetActiveCamera()
        cam_yz.Roll(180) # <---- This works