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Item On The Projective Invariant Representation of Conies in Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1989) Herman, IvanA general formulation for conies and conic arcs for the purpose of computer graphics is given, based on principles and theorems of projective geometry. This approach allows the approximation of these curves by line segments to be postponed in the graphics output pipeline- it results in a more compact storage, faster approximation algorithms and smoother outlook of the curves.Item 2.5 Dimensional Graphics Systems(Eurographics Association, 1989) Herman, IvanThe outline of an extension of traditional 2D graphics systems is given. This extension is aimed at supporting a three dimensional application program, without incorporating full viewing into the general graphics system itself. The resulting system might be very advantageous for large application programs which have their own three dimensional facilities.