Import of openscad-2011.12: OpenSCAD - The Programmers Solid 3D CAD Modeller

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+OpenSCAD is a software for creating solid 3D CAD objects. It is free software
+and available for Linux/UNIX, MS Windows and Mac OS X.
+
+Unlike most free software for creating 3D models (such as the famous
+application Blender) it does not focus on the artistic aspects of 3D modelling
+but instead on the CAD aspects. Thus it might be the application you are
+looking for when you are planning to create 3D models of machine parts but
+pretty sure is not what you are looking for when you are more interested in
+creating computer-animated movies.
+
+OpenSCAD is not an interactive modeller. Instead it is something like a
+3D-compiler that reads in a script file that describes the object and renders
+the 3D model from this script file (see examples below). This gives you (the
+designer) full control over the modelling process and enables you to easily
+change any step in the modelling process or make designes that are defined by
+configurable parameters.
+
+OpenSCAD provides two main modelling techniques: First there is constructive
+solid geometry (aka CSG) and second there is extrusion of 2D outlines. As data
+exchange format format for this 2D outlines Autocad DXF files are used. In
+addition to 2D paths for extrusion it is also possible to read design
+parametes from DXF files. Besides DXF files OpenSCAD can read and create 3D
+models in the STL and OFF file formats.