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Shape selection Mode :
This mode allow to select groups of polygons taht have the same shapes, even is they are moved / rotated / proportionally scaled

NB : This selection mode use A LOT of undo buffer

Starting Shapes
Select some polygons on your reference shape
NB : A shape is defined by all polygons connected to this selection
Set the Shape matching to about 95%, this is the detection threshold
Shapes matching the source are selected.
Same test with twisted planes
you can force the detection to select only shapes with the same size
Test with spheres : only the to smae sized spheres are seleted