[vtkusers] Change display origin from lower left 2 upper left

[Emmanouil Moschidis]

Hi Frank 
I know that with the vtkImageFlip class has this funtcionality when it comes to  the manipulation of a vtkImageData object. I'm not sure about the viewport though... I'd suppose there is no problem as the origin is defined internally in each object and not by the viewport, am I right? 

Frank Lindseth <Frank.Lindseth at sintef.no> wrote: Hi all,

Is it possible to change VTK's display/viewport convention from (origin in lower left):
/\  y
 |
 |
O--------> x


To (origin in upper left):
O--------> x
 |
 |
\/  y








Any help would be greatly appreciated. 





Background:
We would like to replace the old "display system"  in an existing application with a new based on VTK, 
i.e. both display/viewport layout and visualizing exiting data that "assumes" that the display/viewport origin is in the upper left corner, 
converting setup/data coordinates (y) is of course an option, but it would make things a lot easier if VTK used the same origin (as opposed to the lower-left default), 
I'm pretty sure that I was able to set this a long time ago (vtkRenderWindow-method maybe?), but can't find the needed functionality anywhere anymore, 
is it possible? 


- Frank










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