[vtkusers] Need help for polydata clip.

[hellow]

Hello all:
    I have using three methods to clip a delaunay2d mesh, but only first method can return right result.
    I have checked my code for several days and can't find any problem.
So need help to solve it and any suggestion is welcome.
    The full testing code in attatchment,it using released VTK-5.4.2.
 
thanks.
Liang Aibin
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