Sketch (c) 2005, 2006, 2007 Eugene K. Ressler Sketch is a simple system for producing line drawings of 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, both un-useful to us. We wanted to produce finely wrought, mathematically-based illustrations with no extraneous detail and be able to easily overlay TeX math and text. The input language is reminiscent of PSTricks, so will be easy to learn for current PSTricks users. It generates either PSTricks or TikZ/PGF code as output. See http://www.frontiernet.net/~eugene.ressler .