Poly Normal selection Mode :
This mode allow to select polygons using their orientation

NB : 2D polygon are also processed.

	Starting Shape
	Select the direction reference polygon
	Set the normal matching value : 100 % means exact orientation less than 100% allow to select polygons with an orientation near the reference one. Decreasing normal matching will select more and more polygons
	Result : polygons with a direction matching the reference from 75% to 100% are selected
	You can add many different starting directions
	Result
	you can also use predefined direction axis
	In this case, only polygons facing Y+ from 75% to 100% are selected
	You can do a selection and automatically select polygons with the opposite direction
	Activate the "Add opposite" option
	Result...