DWG
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DWG, AutoCAD’s native file format, is the best format for exchanging drawings with other AutoCAD or LT users. Use the SAVE and SAVEAS commands to create DWG files and the OPEN command to open them.
AutoCAD LT AutoCAD LT can’t create every kind of object that AutoCAD can — raster attachments and most 3D objects, for example — but it can successfully read and save DWG files that contain these objects.
Warning AutoCAD 2004 can’t save to the AutoCAD Release 14 DWG format. Apparently, the Autodesk bigwigs figure that the best way to persuade R14 users to upgrade is to make their lives as inconvenient and isolated as possible! If you need to send AutoCAD 2004 drawings to AutoCAD R14 users, save them in R12 DXF format instead of a DWG format. (See the “DXF” section for instructions.)
AutoCAD LT Round-trip DWG fare
The most demanding — and elusive — kind of data exchange is called round-trip transfer. Round-trip means that you create and save a file in one program, edit and save it in another program, and then edit and save it in the first program again. A perfect round-trip is one in which all the data survives and the users of both programs can happily edit whatever they want to. Unfortunately, the perfect round-trip, like the perfect visit to your cousins, rarely happens.
In CAD, round-trip transfer becomes an issue when two people want to work on the same drawings with different CAD programs. AutoCAD and AutoCAD LT have excellent round-trip compatibility, as Chapter 1 explains. Expect a bumpier road if you’re exchanging drawings with users of other CAD programs. Perform some test transfers before you assume that your drawings can get from here to there and back again unscathed.
Autodesk does not document the native AutoCAD DWG file format, and recommends that all file exchanges between AutoCAD and other CAD programs take place via DXF files (see the next section). But several companies have reverse-engineered the DWG format, and it’s now common for other CAD programs to read and sometimes write DWG files directly, with greater or lesser accuracy. Because the DWG format is complicated, isn’t documented, and gets changed every couple of years, no one ever figures it out perfectly. Thus, exchanging DWG files with non-Autodesk programs always involves some compatibility risks.
Warning When you send DWG files to other people — whether they use AutoCAD or a different CAD program — you need to make sure that their software can read the DWG file version that you’re sending. See Chapter 1 for information about AutoCAD DWG file versions.
Remember When you send DWG files to other people, remember to use the ETRANSMIT command to ensure that you send all of the dependent files (fonts, xrefs, and raster images). See Chapter 15 for details.
AutoCAD LT AutoCAD LT can’t create every kind of object that AutoCAD can — raster attachments and most 3D objects, for example — but it can successfully read and save DWG files that contain these objects.
Warning AutoCAD 2004 can’t save to the AutoCAD Release 14 DWG format. Apparently, the Autodesk bigwigs figure that the best way to persuade R14 users to upgrade is to make their lives as inconvenient and isolated as possible! If you need to send AutoCAD 2004 drawings to AutoCAD R14 users, save them in R12 DXF format instead of a DWG format. (See the “DXF” section for instructions.)
AutoCAD LT Round-trip DWG fare
The most demanding — and elusive — kind of data exchange is called round-trip transfer. Round-trip means that you create and save a file in one program, edit and save it in another program, and then edit and save it in the first program again. A perfect round-trip is one in which all the data survives and the users of both programs can happily edit whatever they want to. Unfortunately, the perfect round-trip, like the perfect visit to your cousins, rarely happens.
In CAD, round-trip transfer becomes an issue when two people want to work on the same drawings with different CAD programs. AutoCAD and AutoCAD LT have excellent round-trip compatibility, as Chapter 1 explains. Expect a bumpier road if you’re exchanging drawings with users of other CAD programs. Perform some test transfers before you assume that your drawings can get from here to there and back again unscathed.
Autodesk does not document the native AutoCAD DWG file format, and recommends that all file exchanges between AutoCAD and other CAD programs take place via DXF files (see the next section). But several companies have reverse-engineered the DWG format, and it’s now common for other CAD programs to read and sometimes write DWG files directly, with greater or lesser accuracy. Because the DWG format is complicated, isn’t documented, and gets changed every couple of years, no one ever figures it out perfectly. Thus, exchanging DWG files with non-Autodesk programs always involves some compatibility risks.
Warning When you send DWG files to other people — whether they use AutoCAD or a different CAD program — you need to make sure that their software can read the DWG file version that you’re sending. See Chapter 1 for information about AutoCAD DWG file versions.
Remember When you send DWG files to other people, remember to use the ETRANSMIT command to ensure that you send all of the dependent files (fonts, xrefs, and raster images). See Chapter 15 for details.
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