Yet Another Iteration Over Selections
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This page summarizes a new design for changing the selection implementation in VTK and ParaView. This design proposes a replacement for vtkSelection and vtkExtractSelected* classes in VTK.
Drawbacks for Currrent Design
The fundamental drawback of the current design is that it's not possible to combine multiple selection criteria together easily. The problem is two fold, not only is it not possible in vtkSelection to define such a selection-object, it's complicated to combine multiple extract-selection filters to extract such a combined selection.
