Beta (Inputs.IFC)BetaflatFlat, one level slab.
BetamonoOne slope, rising from the outline's first side to the opposite side.
BetagableTwo slopes rising from the first side and the opposite side to a ridge between them.
BetahipFour slopes rising from every side, to a ridge along the longer sides or, over a square, to a point.
The shape of a roof over a rectangle: flat, sloping one way, two slopes meeting at a ridge, or four slopes meeting at a ridge or a point.