Window grid types

Variables
const int	Frame = 1
	Faces of a frame.
const int	Glass = 2
	Faces of a glass pane.
const int	OutwardSill = 4
	Faces of an outward sill.
const int	Reveal = 5
	Faces of a wall appearing as a result of a window insertion.
const int	Sill = 3
	Faces of a sill.
const int	Undefined = 0
	Undefined.

Possible grid types for a Window mesh