The UnknownUserData type exposes the following members.
Descriptive name of the user data.(Inherited from UserData.)
If you want to save this user data in a 3dm file, override ShouldWrite and return true. If you do support serialization, you must also override the Read and Write functions.(Inherited from UserData.)
Updated if user data is attached to a piece of geometry that is transformed and the virtual OnTransform() is not overridden. If you override OnTransform() and want Transform to be updated, then call the base class OnTransform() in your override. The default constructor sets Transform to the identity.(Inherited from UserData.)