[vtkusers] Picking surface, visible points from vtkAreaPicker

[Sid Murthy]

Hi,

  I am working through an example for the vtkAreaPicker where I get the
selected frustum, Then I set that frustum (vtkPlanes) in
vtkExtractSelectedFrustum prior to getting the point coordinates. My issue
is it gets all selected points through the actor rather than just the
visible ones on the surface of the actor.

This would be same feature as  'Select Points On' rather than *through* in
Paraview.

If anyone could point me in the right direction that would be appreciated.
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