[vtkusers] How to Change Interaction Styles?

[yarram]

Thanks for your reply, I know how to change interaction styles, what I
actually need is: if mouse pointer is on vtkAssembly's object, interaction
style should be "Trackball Actor"; otherwise interaction style should be
"Trackball Camera". Now my problem is: how to identify which object is
behind the mouse pointer? I have done with vtkAssemblypath, but it is too
slow in identifying the object. Please provide me a better and fast
solution.

Thank you.

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