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Creating an AEC Entity Reference
An AEC entity reference is a reference copy of an object. These entity references update when you change the original
object. When you select an object to reference, you must specify a point on the original object as an insertion point
for the marker of the entity reference. A reference marker is displayed in the drawing to mark the insertion point.
You can place the entity reference in the drawing at any location or rotation angle. The distance between the entity
reference and the reference marker remains equal to the distance between the original object and the insertion point
specified. You can change this distance by specifying a new insertion point at a new location in relation to the original
object.
When you change the properties of the original object or edit it with grips, the reference object reflects the changes.
For example, if you want to add custom-shaped mass elements to a drawing, you can add one mass element and
reference it. If you make changes to the original, the entity reference is updated.
Adding a Reference to an Object
Use this procedure to create an entity reference from another object.
1 Open the tool palette that you want to use, and select an AEC entity reference tool.
An AEC entity reference tool is located in the Helper Tools category of the AutoCAD Architecture 2008
Stock Tool catalog. For more information, see “
Understanding the Content Browser ” on page 80.
2 Enter ad (Add), and press
ENTER
.
3 Select the object that you want to reference.
4 Specify a point on the original object to use as the insertion point for the entity reference marker.
5 Specify a location for the entity reference in the drawing.
The distance between the entity reference and the reference marker is equal to the distance between the
original object and the insertion point that you specified.
6 Enter a rotation angle for the entity reference, or press
ENTER
for zero rotation.
7 Press
ENTER
.
The entity reference and reference mark are placed in the drawing at the specified location and rotation angle. If you
edit the original object, the same changes are made to the entity reference.
Attaching an Object to an Existing Entity Reference
Use this procedure to attach an object to an existing entity reference.
1 Open the tool palette that you want to use, and select an AEC entity reference tool.
An AEC entity reference tool is located in the Helper Tools category of the AutoCAD Architecture 2008
Stock Tool catalog. For more information, see “
Understanding the Content Browser ” on page 80.
2 Enter at (Attach), and press
ENTER
.
3 Select the reference marker that you want to use.
4 Select the new object that you want to use to replace the entity referenced, and press
ENTER
.
The new entity reference replaces the former entity reference. The original object is unchanged.
Attaching Hyperlinks, Notes, and Files to an Entity Reference
Use this procedure to attach hyperlinks, enter notes, or attach reference files to an entity reference in a drawing. You
can also edit notes and edit or detach reference files from an entity reference.
1 Double-click the entity reference to which to attach information.
2 On the Properties palette, click the Extended Data tab.
3 To add a hyperlink, click next to Hyperlink, and specify the link.
For more information about adding hyperlinks, see “Add Hyperlinks in a Drawing” in AutoCAD Help.
2140 | Chapter 51 Reference AEC Objects