[vtkusers] Pick points on all polygon surfaces

[zlf]

Hi

I just tried vtkCellPicker#GetPickedPositions. 

But in the result, usually, it only returns one point (There should be two
points since the surface is closed). The point returned is on the surface. 

In other times, it returns more than one point, the first point is on the
surface. While the other points are not on the surface at all.

Thanks

superZZ

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