[vtkusers] A Problem about smoothing ploygon

[赵明昌]

I use vtkSmoothPolyDataFilter to smooth a triangle mesh, and soon i find that the smoothed mesh can contain holes when the Feature Angle and Edge Angle are set to relatively big values( in my program, Feature Angle=120 and Edge Angle=90). I don't know why this can occur. Anyone can help me? 
Thanks!
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