[vtkusers] vtkPolyDataConnectivityFilter to add spatial constraints to KMeans output

[Sara Rolfe]

Hello,

I am using vtkPolyDataConnectivityFilter to separate spatially  
disconnected kmeans regions.  The kmeans cluster numbers are in the  
"Scalers" array of the polydata.  If I understand correctly, my code  
should give each of the connected regions sharing a kmeans cluster  
number a unique region id.  However, my polydata with 95670 points and  
7 kmeans clusters produces 39930 connected regions.  The kmeans output  
does not appear to be noisy, so I don't think this could be right.  My  
code to set up the filter is is below and I would appreciate any  
comments.

Or, is there a better way to accomplish this task?

Thanks for your advice,
Sara

	vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter =  
vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
	connectivityFilter->SetInputConnection(labelReader->GetOutputPort());
	connectivityFilter->SetExtractionModeToAllRegions();
	connectivityFilter->ScalarConnectivityOn();
	connectivityFilter->ColorRegionsOn();
	connectivityFilter->Update();
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