A filling processing apparatus in which the most significant plane of a depth buffer serves as a plane for storing data of discriminating a bore polygon, and the depth data of a contour polygon are stored, as masked by the depth data of the bore polygon, in the depth buffer, whereby a hidden surface...http://www.google.fr/patents/US5265214?utm_source=gb-gplus-shareBrevet US5265214 - Filling processing apparatus and method
