2012

these linetype definitions in the Symbology path in MicroStation, then
when the DGN file is exported from AutoCAD and opened in MicroStation,
the linetypes do not display correctly because of missing linetype
definitions.
See the DGNEXPORT Conversion Table specific details about the scope of
exporting DWG objects and other data to DGN files.
NOTE Do not export drawings that include V8 DGN underlays to a V7 DGN format
file. The V8 DGN references cannot display in a V7 DGN file because the V8 DGN
file format is not a valid design file for the resulting V7 DGN file.
Recommendations
To optimize the data transfer to the MicroStation DGN file format, consider
the following recommendations:
■ Minimize the use of custom objects and other data unique to
AutoCAD-based products
■ Use simple linetypes as much as possible
■ Use simple hatches and hatch styles
■ Use simple gradients and gradient styles
■ Use simple dimension styles if possible
■ Use TrueType text fonts rather than SHX text fonts
■ Work primarily in one format, DWG or DGN, rather than switching back
and forth
When exporting DWG data to DGN files, you need to specify the conversion
units of the DGN seed file (master units or sub-units) correctly based on the
drawing units of the DWG file. For example, if the DWG file you are exporting
to DGN is drawn in inches, and the DGN seed file you are exporting to has
master units set to feet and sub-units set to inches, you need to select sub-units
in the Export DGN dialog box. If you select master units instead of sub-units,
the scale of the imported DWG file will be incorrect. For example, a 36-inch
door would display as a 36-foot door.
1420 | Chapter 34 Work with Data in Other Formats