Railing grid types

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

Possible grid types for a Railing mesh