[vtkusers] Pass values from vtkCommand

[andon]

I thought exactly the same thing, but it doesn't work...i can't in this way
use the data out of the callback function...maybe because of the casting i
need to do to use the clientData as a vtkFloatArray...it could be possible
that this casting makes a copy of the data and than i don't modify the data
but just a copy that is delated at the end of the callback function? In your
opinion how can i solve this problem?

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