Railing grid types

Variables
const int	Baluster = 3
	Faces of balusters.
const int	Cut = 4
	Faces appearing as a result of cutting a railing by other objects.
const int	Filling = 2
	Faces of fillings.
const int	Handrail = 1
	Faces of a handrail.
const int	Undefined = 0
	Undefined.

Possible grid types for a Railing mesh