1. A method for creating a polygonal mesh of an anatomical region on a patient, the method comprising: obtaining a first polygonal mesh representing at least a portion of the anatomical region; obtaining a second polygonal mesh representing at least a portion of the anatomical region; positioning the first polygonal mesh at an appropriate location with respect to the second polygonal mesh; determining common regions between the polygonal meshes; selecting one of the polygonal meshes as a master polygonal mesh and another of the polygonal meshes as a secondary polygonal mesh for each common region; eliminating duplicative data in the secondary polygonal mesh for each common region; and joining together the master polygonal mesh for each region to produce a combined polygonal mesh representing the anatomical region of the patient.