[vtkusers] read from vtk window

[Massinissa Bandou]

Hi Joachim,

Sorry, let me explain what I mean. I created a Qt GUI to display my object
file using vtkOBJReader after clicking a push button. Until now everything
is ok. 
Now, I want to extract a portion of this object or mesh using another push
button. Instead of reprogramming the whole process of reading, I just want
to know if it's possible to read and get information of the data directly
from the rendered window. I want to create a function that can extract the
information from the vtk window for example: which kind of data, object,
polydata, dicom or..? 

Thx! for reply!

Massi 



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