[vtkusers] render window coordinate system and picking

[CLEMENTS, ROBERT]

Is it possible to change the coordinate system in the renderwindow so that mouse clicks  are translated differently to the prop picker. 
For example,  when a user clicks on the renderwindow at position X = 200 , Y= 200 , the object that is picked is actually located behind  x=100 , y=200 in the window.  

I have tried playing around with the vtkCoordinate but have not yet figured it out how to use the userdefined coordinate system.  
Maybe this is the incorrect way to go about it.

thanks.

Rob