Offset Quarter Pipe Generator

Generates a quarter pipe as a .map file to be opened in GtkRadiant. This is different from the regular Quarter Pipe Generator because the vertices for the curve are rotated downwards by half of a slice.

radius:		The radius of the face of the pipe.
slices:		The number of individual brushes that will make up the surface of the ramp.
crossSection:		The height and depth of a quarter pipe. Note that the bottom brush may stick out due to the offset, but that distance is ignored here.
length:		How long the pipe is. Can also be described as the width of the curved face.
generateOnlySeam:		Generates only the bottom brush.
adjustSeamForJoining:		This affects the shape of the bottom brush. Typically, this brush sticks out past the midline of the pipe due to the offset. If this flag is checked, the bottom brush is cut short by the midline, and its end vertex is moved down to lie exactly radius units directly below the circular center of the pipe.

	generate normal non-overlapping brushes	Generates ordinary brushes. To make a slick cylindrical surface that is free from "bouncy" behavior, you will either have to add something like shingles to the surface or generate overlapping brushes. Another purpose for normal brushes is to define the visual component of a structure, for example by using surfaceparm nonsolid.
	generate overlapping brushes	Overlapping brushes are useful for making slick cylindrical surfaces such that the player doesn't "bounce" off the surface. However, it is not advised to texture the overlapping brush faces with drawn textures. Instead, apply slick caulk to all of the overlapping brushes, then superimpose a set of normal non-overlapping brushes that have surfaceparm nonsolid.