[vtkusers] vtk file

[´÷˶]

hi, everyone
    I'm using vtkPolyDataConnectivityFilter to extract connective regions out of a vtkPolyData object. And I want to save the results (the extracted regions) in a vtk file. I tried vtkAppendPolyData, but it seemed to merge those regions into a single big one. so that I have to extract regions again after loading the vtk file. Do I have to save each extracted region into separate files?
    Any suggestions will be greatly appreciated.
                                                        Daishuo
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