[vtkusers] Can vtkSelectEnclosedPoints->IsInside work for concave surfaces?

[Jothy]

Hi all,

I wonder whether this vtkSelectEnclosedPoints->IsInside works well for
concave 3D surfaces!

>From the docs, I found it assumes the surface is closed and manifold.

Or, is it better to use vtkPolygon->PointInsidePolygon, which uses ray
tracing to determine this.

Thank you

Jothy
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