Define an object class
by selecting a sample object in your drawing, choosing which of
its properties to include in the definition, and specifying the
For example, if you want
to define an object class for maintenance hole covers, select an
existing maintenance hole cover in your drawing.
If you do not have a
sample object in your drawing, create an object with the data and
property settings that you want to include in the object class definition.
For each object class, AutoCAD Map 3D stores
information on how to create the object, what properties it should
have, what data should be attached, and what topology information
should be associated with it. All objects you create using this
object class definition have the selected properties and values.
Editing Object Class Definitions
To define an object class,
you must have Alter
Object Class Privileges.
one person should edit object class definitions at a time. If two people
edit at the same time, one set of edits may be lost.
If someone has recently
edited the definition file, quit AutoCAD Map 3D and restart to get the
Renaming an Object Class
When you rename an object
class, you change the name only in the object class definition file.
Any objects tagged with the object class name are unchanged. Since
these objects point to a name that no longer exists in the object
class definition file, the objects become undefined. You can search
for these undefined objects and update their object class name.