Drawing opaque solids using an incremental plotter

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Abstract
This paper describes an ALGOL program which provides shaded drawing of any opaque polyhedron viewed from three mutually perpendicular directions. Since the projection of a face onto a plane perpendicular to the direction of vision is a plane polygon, much of the program consists of procedures which perform operations on polygons. The main operation involves processing two polygons that overlap to derive the visible part of the one taken to be underneath. Before this calculation takes place, it is necessary to know that the two polygons chosen do in fact overlap, and to have a criterion for determining which of the two is to be treated as the one on top. Section 1 of the paper describes the main program except for the procedures, which are described in Section 2. Specimen results are given in Section 3.

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