Herman, Ivan2015-10-052015-10-0519891017-4656https://doi.org/10.2312/egtp.19891031The 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.10.2312/egtp.19891031