[Paraview] Changing the size of vtkXOpenGLRenderWindow

[the lily]

Dear all 

I'm constructing the depth map using the following 

view = GetActiveView().GetRenderWindow()
w2i = vtkWindowToImageFilter()
w2i.SetInputBufferTypeToZBuffer ()
w2i.SetInput(view)
w2i.Update()


the only problem that it is always giving me a dpeth map of size (400,400) and I think that because of the size of the view

so I tried setting the view size but that did not work, so can someone hep ?
 		 	   		  
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