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The authors have been developing KETpic as a bundle of macro packages for Computer Algebra Systems (CASs) to draw fine  TEX{\rm\kern-.15em T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX} -pictures. Recently we have developed a new method of the surface drawing using KETpic. The equation of envelopes is used to draw ridgelines of surfaces. Also the technique of hidden line elimination is used. By these methods, we can draw 3D-graphics which are so simple that the global (i.e. sketchy) shapes of them are easily understood.

lecture notes in computer science

A Simple Method of the ${\rm\kern-.15em T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}$ Surface Drawing Suitable for Teaching Materials with the Aid of CAS