The Lazy Z-buuer

This paper describes a new perspective on a fundamental algorithm of three dimensional computer graphics namely z bu ering An imple mentation of the z bu er method in a lazy functional language behaves in a quite di erent manner to the traditional imperative counterpart The main result of this paper is to show that the lazy z bu er is a scan line method The e ective di erence between scan line methods and z bu ers is one of order of evaluation A hybrid algorithm with properties common to both z bu er and scan line methods is also described