Ramp grid types

Variables
const int	BackSide = 4
	Side face of a ramp at the end where the ramp building has been finished.
const int	Bottom = 2
	Bottom face of a ramp.
const int	Cut = 7
	Faces appearing as a result of cutting a ramp by other objects.
const int	FrontSide = 3
	Side face of a ramp at the end where the ramp building has been started.
const int	LeftSide = 5
	Left side face of a ramp (when looking at the front face).
const int	RightSide = 6
	Right side face of a ramp (when looking at the front face).
const int	Top = 1
	Top face of a ramp.
const int	Undefined = 0
	Undefined.

Possible grid types for a Ramp mesh