[vtkusers] 3D cube for visible point selection

[Saeed Bakhshmand]

Hello All,

Currently I am working on this example
<https://github.com/Kitware/VTK/blob/master/Examples/Annotation/Python/labeledMesh.py>
that teaches how to use vtkSelectVisiblePoints. As you can see, selection
window is 2D recatngle (visPts.SetSelection(xmin, xmin + xLength, ymin,
ymin + yLength)) in this example, does anybody know a trick/function that
can select contents of 3D cube?

Sincerely,
Saeed
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