[vtkusers] How to manipulate multiple actors at the same time

[Wenlong Wang]

Dear friends,

I've got a problem. I have two actors share the same renderer, render window
and interactor. And I applied 'trackball' style in my interactor.

However, I can only drag or zoom the actor which is 'selected' by the mouse.

My question is, how can I move and zoom in/out these two actors at the same
time?

Thank you very much for your kind help. Many thanks in advance!

Bests
Long
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