[Paraview] Python camera script

[Robert Maynard]

The included script is designed to allow the user to manipulate the camera
position, the first test I wrote
was the ability to reset the camera to positive X, negative Y etc. The
problem is that the changes to the camera
position are not updating untill I actually manually focus the render
window. I presume the problem is that I am
not updating a key component. Can anybody tell me what one I am missing?

#!/usr/bin/env python

import paraview
#camera is an already defined class
class Cam:
  def PosX(self):
    Cam.__Reset(self,1, 0, 0, 0, 0, 1)
  def NegX(self):
    Cam.__Reset(self,-1, 0, 0, 0, 0, 1)
  def PosY(self):
    Cam.__Reset(self,0, 1, 0, 0, 0, 1)
  def NegY(self):
    Cam.__Reset(self,0, -1, 0, 0, 0, 1)
  def PosZ(self):
    Cam.__Reset(self,0, 0, 1, 0, 1, 0);
  def NegZ(self):
    Cam.__Reset(self,0, 0, -1, 0, 1, 0);
  #Private Methods
  def __Reset(self,look_x, look_y, look_z,up_x,up_y,up_z):
    pxm = paraview.pyProxyManager()
    iter = pxm.group_iter("view_modules")
    activeView = None
    for proxy in iter:
      if proxy.IsA("vtkSMRenderModuleProxy"):
        activeView = proxy
        break
    if activeView:
      activeView.SetCameraPosition(0, 0, 0);
      activeView.SetCameraFocalPoint(look_x,look_y,look_z)
      activeView.SetCameraViewUp(up_x,up_y,up_z)
      activeView.ResetCamera()
      activeView.UpdateVTKObjects()
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