About Custom Objects and Proxy Objects
Custom objects provide additional capabilities to the program and related products.
When the application that created the custom object is not available, a proxy object
is substituted in its place.
A custom object is a type of object created by an ObjectARX آ® (AutoCAD Run-Time Extension) application, which typically has more specialized capabilities
than standard AutoCAD or AutoCAD LT objects. Custom objects include parametric solids
(AutoCAD آ® Mechanical), intelligently interactive door symbols (AutoCAD آ® Architecture), polygon objects (AutoCAD آ® Map 3D), and associative dimension objects (AutoCAD and AutoCAD LT).
In addition to Autodesk, many software vendors use ObjectARX to write programs that
create graphical and nongraphical custom objects that are useful in their AutoCAD
A proxy object is a substitute for a custom object when the ObjectARX application
that created the custom object is not available to AutoCAD, AutoCAD LT, or other host
applications. Later, when the application is available, the proxy object is replaced
by the custom object.
Proxy objects have significantly reduced capabilities compared to their corresponding
custom objects. The extent to which proxy objects can be edited is determined by the
parent ObjectARX application. For example, operations such as erasing and moving an
object, or changing object properties, may or may not be possible on a proxy object,
depending on the application that created it.
When you open a drawing, you might see a Proxy Information dialog box. The dialog
box tells you the total number of proxy objects in the drawing (both graphical and
nongraphical) and the name of the missing application and provides additional information
about the proxy object type and display state. You can use the dialog box to control
the display of proxy objects.
An object enabler is a tool that provides specific viewing and standard editing access
to a custom object in the host applications when the application that created the
custom object is not present.
Object Enablers allow custom objects in a drawing to behave with more intelligence
than proxy graphics. Object enablers also facilitate workgroup collaboration when
using other Autodesk products.
If the ObjectARX application is not installed on your system, you can check for available
Object Enablers on the Web. For example, if you receive a drawing that contains objects
that were created in AutoCAD Architecture, but you don’t have that application installed
on your system, the AEC Object Enabler is downloaded so you can view those drawings
as they were intended.
For a complete list of the currently available Object Enablers, go to the Autodesk
Web site at http://www.autodesk.com/enablers.
If an application such as AutoCAD آ® Map 3D was used to add a feature (object) classification to an object, you can view
the classification in the Properties palette in the Class Name entry. If the object’s
classification is missing from the associated classification (XML) file, or if the
associated classification file is missing, an exclamation mark is displayed in the
Class Name entry. For information about what is required to create a feature classification,
see the AutoCAD آ® Map 3D documentation.
You can also use the Quick Select feature to select objects by their Class names
and Class properties.
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