[vtkusers] prevent vtkCamera Yaw, Azimuth change

[Dean Inglis]

Hi all,

My pipeline consists of 1 render window (renWin) containing 4 renderers:
- ren1 shows 3 modified vtkImagePlaneWidgets (allows vtkImageData*
widget->GetOutput())
- ren2 to ren4 show the output vtkImageData through vtkImageActors
renWin's interactor, iren, which is shared among the 4 renderers, uses the
default
vtkInteractorStyleSwitch, usually vtkInteractorStyleTrackBallCamera.  The
interactor
behaviour is ideal for ren1 but what is ONLY needed for ren2 to ren4 is
camera dolly
and pan.  Some ideas are:

1)
ren2_to_4->SetEndRenderMethod(some_method_to_reset_the_renderer_activer_came
ra)
2) iren->SetUserMethod(some_method_to_reset_the_renderer_activer_camera)

comments? any others?

Dean