[vtkusers] ordering nodes by using vtk?

[eeemreee]

Hi, we have a .vtk file with lots of points. It is an unstructed gird file, 
i must order the boundary points according to images boundary and after 
ordering it, i must order the interior nodes in the file, is there a way for 
doing it by using vtk?? your prompt reply will be appreciated since there is 
an emergency for implementation
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