Mastering AutoCAD 2016 and AutoCAD LT 2016: Autodesk Official Press by Omura George

Author:Omura, George [Omura, George]
Language: eng
Format: azw3
ISBN: 9781119044840
Publisher: Wiley
Published: 2015-04-22T16:00:00+00:00

Nesting Xrefs and Using Overlays

Xrefs can be nested. For example, if the Common.dwg file created in this chapter used the Unit.dwg file as an Xref rather than as an inserted block, you would still get the same result in the Xref-1.dwg file. That is, you would see the entire floor plan, including the unit plans, when you opened Xref-1.dwg. In this situation, Unit.dwg would be nested in the Common.dwg file, which is in turn externally referenced in the Xref-1.dwg file.

Although nested Xrefs can be helpful, take care in using Xrefs this way. For example, you might create an Xref by using the Common.dwg file in the Floor1.dwg file as a means of referencing walls and other features of the Common.dwg file. You might also reference the Common.dwg file into the Floor2.dwg file for the same reason. After you did so, however, you’d have three versions of the Common plan in the Xref-1.dwg file because each Xref would have Common.dwg attached to it. And because AutoCAD would dutifully load Common.dwg three times, Xref-1.dwg would occupy substantial computer memory, slowing your computer when you edited the Xref-1.dwg file.

To avoid this problem, use the Overlay option in the Attach External Reference dialog box. An overlaid Xref can’t be nested. For example, if you use the Overlay option when inserting the Common.dwg file into the Floor1.dwg and Floor2.dwg files, the nested Common.dwg files are ignored when you open the Xref-1.dwg file, thereby eliminating the redundant occurrence of Common.dwg. In another example, if you use the Overlay option to import the Unit.dwg file into the Common.dwg file and then attach the Common.dwg into Xref-1.dwg as an Xref, you don’t see the Unit.dwg file in Xref-1.dwg. The nested Unit.dwg drawing is ignored.

If you have used the Attach option to insert an Xref and want to change it to Overlay, you can do so in the External References palette. Click the External References icon in the Insert tab’s Reference panel’s title bar, and then in the External References palette, right-click the name of the Xref that you want to change and select Xref Type Overlay. Use the same steps to convert an Overlay Xref into an Attached Xref, but use Xref Type Attach after you right-click on the Xref name.

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