[vtkusers] Differences in vtkPolyData for use with vtkCurvatures

[Olliebrown]

Found a quick fix.  Just process the output of the vtkOBJReader with a
default vtkCleanPolyData filter.



> vtkSmartPointer<vtkCleanPolyData> cleaner =
>             vtkSmartPointer<vtkCleanPolyData>::New();
> cleaner->SetInputConnection(readerOutput);
> 

The resulting vtkPolyData has the exact same vertex count as the PLY reader
and the vtkCurvatures result is identical (and correct).  woot!

Seth
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