[vtkusers] How to get boundary points???

[Larry]

Hello, everyone!
I have a vtkPolyData, which is in my case actually a bunch of triangle
cells lie on the same plane, now I want to get the boundary that enclose all
the triangles.

Simply to say, that I have some points, and I'd like to figure out the boundary points.

Is there any way in vtk to do that?

Thanks!

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