[vtkusers] Adding actor later to vtkImageViewer2

[tao sun]

Hi,


I have a volume to display in XY direction in a vtkImageViewer2. Then I
overlay a lineSource actor on slice, and it works fine. However, after a
change the default camera position (mirror), the line disappeared. I guess
this is actually due to that fact line actor goes behind the volume? How
can I make it overlay on top again?


Regards,
Sun Tao
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