SHAPE SPLITTING METHOD, SHAPE SPLITTING PROGRAM, DATA PROCESSING DEVICE, LENS DATA PROCESSING METHOD, LENS MACHINING METHOD, AND LENS DATA PROCESSING PROGRAM

摘要

A shape division method is provided for dividing three-dimensional shape data of a spectacle lens into data regarding a plurality of shape element portions used for edging the spectacle lens, including: a projection shape acquisition step of acquiring data regarding a projection shape of a circumferential edge of the spectacle lens as projection shape data based on the three-dimensional shape data; an outermost shape extraction step of obtaining a prescribed circumscribed graphic shape circumscribing a projection shape specified by the projection shape data at each prescribed angle while changing a relative angle of the projection shape and the circumscribed graphic shape, and extracting data regarding a shape of an inside area common to each of all obtained circumscribed graphic shapes, as outermost edging shape data; and a penetrated edging shape extraction step of obtaining a differential area between a shape specified by the outermost edging shape data and the projection shape specified by the projection shape data, and extracting data regarding a shape portion of the obtained differential area as penetrated edging shape data.