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+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 .
+