[vtkusers] vtkImageActor layers/bring to front?

[David Doria]

Is there any concept of priority or "front" with vtkImageActor?

Say for example I have two vtkImageActor's (2D) both with some transparency
and I want to switch which one is "on top". Is there a way to do this
without actually translating one of the images perpendicular to the camera?
That is, if both images occupy the same space (the Z=0 plane for example),
how do you determine which one is visible?

Thanks,

David
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