Wall grid types

Variables
const int	BackSide = 2
	Back face of a wall.
const int	Bottom = 3
	Bottom face of a wall.
const int	Cut = 8
	Faces appearing as a result of cutting a wall by other objects.
const int	FirstButt = 5
	A face on the left side (when looking at the front face).
const int	FrontSide = 1
	Front face of a wall.
const int	Reveal = 7
	Faces appearing as a result of insertion of an aperture.
const int	SecondButt = 6
	A face on the right side (when looking at the front face).
const int	Top = 4
	Top face of a wall.
const int	Undefined = 0
	Undefined.

Possible grid types for a Wall mesh