sketch – A 3d sketch lan­guage trans­la­tor

Sketch is a small, sim­ple sys­tem for pro­duc­ing line draw­ings of two- or three-di­men­sional ob­jects and scenes. It be­gan as a way to make il­lus­tra­tions for a text­book af­ter we could find no suit­able tool for this pur­pose. Ex­ist­ing scene pro­ces­sors em­pha­sized GUIs and/or photo-re­al­ism, nei­ther of which was use­ful to us. We wanted to pro­duce finely wrought, math­e­mat­i­cally-based il­lus­tra­tions with no ex­tra­ne­ous de­tail.
The in­put lan­guage is rem­i­nis­cent of PSTricks, so will be easy for cur­rent PSTricks users to learn; out­put is for use ei­ther by pstricks it­self, or by pgf