When setting up and using
object classification, follow these guidelines for the best results:
- Use only one object class definition file
for a project. Object classes should be general enough that a definition
for “roads” is appropriate in any circumstance. Create subclasses
for freeways, parkways, small streets, and so on.
- Only one person should edit object class
definitions at a time, or one set of edits might be lost. If the
definition file was just edited, quit AutoCAD Map 3D and restart it
to get the updated definitions.
- Distinguish between the Object
Type (on the Applies To tab
of the Define Object Classification dialog
box) and the Create Method (on the Class
Settings tab). Object Type determines
which existing objects you can add to this object class.
If the object was not created with the selected method, you cannot
add it. Create Method determines the
method used to create new objects from this class (when you right-click
the object class and choose Create Classified Object).
you plan to use this object class with objects from a drawing source, do
not select more than one object type
- Avoid renaming object classes, because
this changes the name only in the object class definition file.
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
undefined objects and update their object class name.
- Avoid including styling options in object
class definitions. For example, you can draw points using a block.
You can specify that block if you use Block as
the Create Method for an object
class that represents point data. However, the block will not scale
to the map, and might cause more work than it saves. Instead, create
a drawing layer in Display Manager and assign
the point objects to that layer. Style the layer from Display
Manager using the desired block.