[vtkusers] vtk***Instantiator ???

[Steven Wu]

I've newly download the nightly package. I find new
object creators added to the source. They are classes
with names as vtk***Instantiator  . Within these class
implemented static functions for objects creation. I
do't know what future features related to these class
will be added by VTK group. Will VTK group advise
users to create objects in this way at last?

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