[vtkusers] Determining Actor type

[David Doria]

>
>
> Again, this only works for leaf classes. It doesn't have any machinery for
> matching an intermediate class. Leaf classes are the most common case, so
> this will work in most cases.
>
> But suppose you wanted to find all 2D actors. For that you'd need a
> dynamic_cast.
>

Here are 4 methods that all work in this case:
http://www.vtk.org/Wiki/VTK/Examples/DetermineActorType

Ken - if you want to change it / add a case where nothing but the
dynamic_cast works, please feel free.

Thanks,

David
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