Open Design Alliance and DWG/DXF
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 From:  Michael Gibson
3458.2 In reply to 3458.1 
Hi 3dcnc, well OpenDWG is a library from a company called the Open Design Alliance, you can find some info about them on their web site here:

They've done a bunch of work to reverse engineer the DWG format (which Autodesk does not publicly document), and make a library that enables reading and writing to it.

> I have noticed that some CAD software develop there
> own DWG converters, Why?.

Well, I'm not really very sure that people are developing their own, since it is quite a large task to do a good job of it.

As far as I know software that deals with DWG will license either the ODA libraries, or the "RealDWG" libraries from Autodesk.

DXF is another story - DXF is documented (except for 3D solids which are encrypted) so there are a lot more self-developed DXF converters out there than DWG converters.

- Michael
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