6. The method of claim 5 , wherein the first area of the ear is a tip of a tragus on a surface of the ear, the second area of the ear is a tip of an antitragus on the surface of the ear, and the third area is a midpoint between the tragus and the antitragus.
5. The method of claim 1 , wherein orienting the at least one ear model comprises: mating a first area of the ear to an origin of the coordinate system; mating a second area of the ear to an x-axis of the coordinate system; and mating a third area of the ear to an x-z plane of the coordinate system.