2011

Table Of Contents
file. If the file contains 3D solids, surfaces, or other 3D objects, a warning
is displayed. This content is not supported in this file.
Use the Ribbon Contextual Tab to Work with Underlays
If you select an underlay when the ribbon is active, the DWF Underlay Ribbon
Contextual Tab, PDF Underlay Ribbon Contextual tab, or the DGN Underlay
Ribbon Contextual tab displays depending on the type of underlay selected.
The contextual tab contains options for adjusting, clipping and displaying
underlays. The ribbon contextual tab is dismissed automatically after the
underlay is deselected.
Attach, Scale, and Detach Underlays
You can add or remove references to underlays within drawing files, or you
can change their relative size.
Attach Files as Underlays
You can attach a DWF, DWFx, DGN, or PDF file as an underlay to a drawing
file.
You reference and place underlay files in drawing files the same as you do
raster image files; they are not actually part of the drawing file. Like raster
files, the underlay is linked to the drawing file through a path name. The path
to the file can be changed or removed at any time. By attaching underlays
this way, you can use files in your drawing without greatly increasing the
drawing file size. You can only view DWF and PDF underlays in the 2D
Wireframe visual style. DGN underlays can be viewed in any visual style.
NOTE Although underlay files are reproductions of their source drawing, they are
not as precise as drawing files. Underlays may show slight discrepancies in precision.
See also:
For information on identifying referenced underlays, see Highlight External
References in a Drawing in
Attach and Detach Referenced Drawings on page
1668.
Attach PDF Files
There are a few things specific to PDF files that you do not have to consider
with DWF or DGN files. PDF files with more than one page are attached one
1750 | Chapter 37 Work with Data in Other Formats