Extract/Threshold/Mask on Points and Geometry
ExtractPoints (by Id and by VOI), ThresholdPoints (by predicate), MaskPoints (by stride), Mask (cells by stride), ExtractGeometry (cells by Id and by VOI). Point subsetting creates a CellSetSingleType<> on VERTEX for points that pass but all original points remain. Mask and ExtractGeometry create CellSetPermutation.