[vtkusers] Interactor stops working when opacity too low?

[Perryn Fowler]

Hello

I have rendered a vtkVolume with a vtkInteractorStyleTrackballActor
Interactor.

I have also implemented a slider to allow the user to alter the opacity of
the displayed volume.

Unfortunately if the opacity is changed to be too low, the interactor seems
to stop working ( ir you can no longer rotate, pan, etc). If you raise the
opacity it starts working again.

any ideas whats going on here?

cheers
Perryn
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