[vtkusers] a problem about vtkPolyDataConnectivityFilter

[戴 硕]

hi, everybody
    I'm using vtkPolyDataConnectivityFilter to extract connective regions 
out of an isosurface (thanks for alex's great help). But i can't obtain the 
number of connective regions with GetNumberOfExtractedRegions(). Everytime, 
it returns 0.
    my poly data set involves 24 connective regions (i wrote another 
program to get this number), how can I use vtkPolyDataConnectivityFilter to 
get it directly?plz give me a hand! thx a lot!
                                                        Daishuo

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