AutoCAD DXF (Drawing Interchange Format, or Drawing Exchange Format) is a CAD data file format, developed by Autodesk as their solution for enabling data interoperability between AutoCAD and other programs.
DXF was originally introduced in December 1982 as part of AutoCAD 1.0, and was intended to provide an exact representation of the data in the AutoCAD native file format, DWG (Drawing), for which Autodesk didn't (and doesn't) publish specifications. Autodesk currently publishes specifications on its website for versions of DXF dating from AutoCAD Release 13 (November 1994) to AutoCAD 2006 (March 2005.)
Versions of AutoCAD from Release 10 (October 1988) and up support both ASCII and binary forms of DXF. Earlier versions support only the ASCII form.
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L.A. Times - Technology News
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404AutoCAD DXF Documentation - Technical information about DXF from its creators Autodesk. This DXF Reference is available for online viewing, or it can be downloaded as a WinHelp file, or a zipped set of HTML files.
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DWG DXF Convert - An AutoCAD DWG/DXF bi-directional translator built using the powerful DWGDXFLib library. It converts an AutoCAD DWG file into an AutoCAD DXF file and vice-versa without the need of AutoCAD. DWG DXF Convert also supports batch conversions of multiple DWG or DXF files.
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DXF to OpenGL - This program reads a 3D graphics image file, in the DXF data format, and displays it using OpenGL.
DXF2rad - A converter to translate 3D DXF data to the Radiance scene file format, available for multiple platforms.