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Why are there 4 formats and which one should I use?
There are four formats in FME that can be used to read or write AutoCAD drawing files (.dwg or .dxf)
Note: This solution applies to AutoCAD drawing formats (.dwg and .dxf.) AutoDesk DWF and SDF formats are not covered here and should be considered completely different formats.
We aim to support the latest version of AutoCAD applications.For best performance be sure that your version of FME is newer or the same as your version of AutoCAD.For example if you are wanting to read a file created in AutoCAD 2018 then FME 2018 and higher is what you will want to be using for the best results.
1) Autodesk AutoCAD DWG/DXF (ACAD)
This format is built in FME using libraries from the Open Design Alliance.In addition to supporting standard AutoCAD entities,the ACAD format supports primitive 3D geometry reading and writing.Generally 3D objects are decomposed into meshes and converted to composite surfaces.Solids are turned into surfaces,meshes are turned into less efficient surfaces,and textures are lost.
Note: Because the format uses libraries from the Open Design Alliance you may notice a warning message when opening file created with this writer in AutoCAD about the file being not developed or licensed by Autodesk.This warning is not present when using the REALDWG writer (see below).
The ACAD format is supported on Windows (32 bit and 64 bit),Linux,and Mac.
2) Autodesk AutoCAD RealDWG DWG/DXF (REALDWG)
This format is built in FME using the REALDWG library provided by AutoDesk Inc.The REALDWG format supports more full 3D geometry reading and writing.Generally surfaces are handled as meshes,and solids as BREPs composed of mesh surfaces.Textures may be used,but only on subdivision meshes which may be a subset of dataset to be read.Surfaces other than meshes which have textures in FME,may be converted to subdivision meshes on write.
The REALDWG format is supported on Windows (32 bit and 64 bit).
As of FME 2016.0,RealDWG is also not supported on Windows Server 2008 SP2 and earlier.This affects the AutoCAD RealDWG DWG / DXF plugin,and the AutoCAD Map 3D Object Data plugin.
If you want to DWG read files created with a AutoCAD 2018 you will need FME 2017.1 or higher.
3) Autodesk AutoCAD Map 3D Object Data (AUTOCAD_OD)
This format is an extension of the REALDWG library above but intended for use when you want to read or write object data as used in Autodesk Map 亚搏在线娱乐平台products.Otherwise this format has the same 3D capabilities and the same platform limitations as the REALDWG format above.
If you want to DWG read files created with a AutoCAD Map 3D 2018 you will need FME 2017.1 or higher.
As of FME 2017.0 The AUTOCAD_OD format is supported only supported on Windows 64 bit.
4) Autodesk AutoCAD Civil 3D (CIVIL3D)
This format is primarily intended for use with the AutoDesk product CIVIL 3D.It extends the capability of drawing file reading to include entities which are specific to Civil 3D.
More details on this format and a complete list of supported and unsupported geometries and features can be found here:Autodesk_AutoCAD_Civil_3D
The CIVIL3D format (reader only) is supported on Windows (32 bit and 64 bit),Linux,and Mac.
To ensure you can read files created with Civil 3D be sure that the version of FME is the same or higher than that of the version of Civil 3D that was used to create the file.
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