IFC will convert 2D information as well. but try the translators, round trip if that is what you will be doing.
Will they be working on the files in vectorworks?
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"