[vtkusers] Picking actors in vtkImageViewer2

[Jothy]

Hi all,

I am unable to pick the actors in vtkImageViewer2 in "actor" interaction
mode. I think vtkImageViewer add all the actor with PickableOff(). So, how
to pick the actor. I tried adding the actor with actor->PickableOn(), but no
effect!

Any hints?

Thanks,

Jothy
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