[vtkusers] Transforming a vtkActorCollection

[David Doria]

Currently to transform all actors in a collection I am iterating through the
Collection and applying the transform to every actor:(like this:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TransformActorCollection
 )

There is an ApplyProperties function which lets you set properties of all
the actors without manually iterating through the collection - is there
something like this for transformations? The idea is to create a "compound
object" and be able to move it around all at the same time as if it were a
single object.

Thanks,

David
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