Issue No. 01 - January (1972 vol. 21)
R. Mahl , Department of Data Processing, School of Mines
This paper describes two algorithms which find the visible portions of surfaces in a picture of a cluster of three-dimensional quadric patches. A quadric patch is a portion of quadric surface defined by a quadratic equation and by zero, one, or several quadratic inequalities. The picture is cut by parallel planes called scan planes. The visibility problem is solved in one scan plane at a time by making a "good guess" as to what is visible according to the visible portions found in the previous scan plane.
Computer-aided design, curved surfaces, curvilinear surface representation, data structures, halftone pictures, hidden lines, visible surfaces.
R. Mahl, "Visible Surface Algorithms for Quadric Patches", IEEE Transactions on Computers, vol. 21, no. , pp. 1-4, January 1972, doi:10.1109/T-C.1972.223424