What is the difference between an attachment and an overlay in AutoCAD?

Attachment: Saves a copy of the xref drawing in your drawing. Overlay: Creates a link to the xref drawing in your drawing.

What is an overlay AutoCAD?

External references, or xrefs, are files brought into AutoCAD drawings as attachments or overlays. The option to overlay or attach an xref is available under the Reference Type section of the Attach External Reference menu in AutoCAD.

What is an xref overlay?

An overlaid xref does not load or bring with it any nested xrefs. For example, if you xref “A” into your parent drawing, which contains a nested xref, drawing “B”, only drawing “A” will be referenced in. Drawing “B” will not be loaded into the parent drawing because it is a nested xref.

What is difference between overlay and attach xrefs?

Attachment: Saves a copy of the xref drawing in your drawing. Overlay: Creates a link to the xref drawing in your drawing.

What is overlay?

to lay or place (one thing) over or upon another. to cover, overspread, or surmount with something. to finish with a layer or applied decoration of something: wood richly overlaid with gold. Printing. to put an overlay upon.

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What is difference between attachment and overlay?

Attachment: Saves a copy of the xref drawing in your drawing. Overlay: Creates a link to the xref drawing in your drawing.

How do you make an overlay xref?

To Overlay an Xref

  1. Click .
  2. In the Select Reference File dialog box, select the file you want to attach and then click Open.
  3. In the External Reference dialog box, under Reference Type, select Overlay.
  4. Specify the insertion point, scale, and rotation angle. Click Specify On-Screen to use the pointing device. …
  5. Click OK.

How do I overlay two DWG files?

To Work With Overlays

  1. Click Insert tab Reference panel Attach. …
  2. In the Select Reference File dialog box, select the file you want to attach and click Open.
  3. In the Attach External Reference dialog box, under Reference Type, select Overlay.

What are overlays in drawing?

Using overlays, you can superimpose selected views or an entire sheet of one drawing over the current drawing sheet. This functionality is available for drawings, layouts, reports, and diagrams; each can reference objects of these four types, as well as formats.

How do you remove overlays in AutoCAD?

Solution: Select objects in a drawing (use CTRL-A to select everything) and then type OVERKILL on the command line. Click OK on the Delete Duplicate Objects dialog window, adjusting settings as desired (the default options are usually sufficient). Overkill deletes information that is overlaying other items.

How do you overlay models in Revit?

Show or Hide Nested Models

  1. Open the parent model to which the nested model is linked.
  2. Click Manage tab Manage Project panel (Manage Links).
  3. In the Manage Links dialog, click the Revit tab.
  4. In the Reference Type column, change the value for the linked model to one of the following: Attachment. …
  5. Save and close the file.
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How do I use underlay in Revit?

Create an Underlay

  1. In the Project Browser, open a plan view.
  2. On the Properties palette, for Range: Base Level, select the level you want to underlay. Range: Top Level is automatically set to one level above the Base Level. …
  3. On the Properties palette, for Underlay Orientation, select Look Up or Look Down.
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