Antialiasing does not work on the current master.
This feature always used to work with the older QvtkWidget and stopped working with the newer QvtkWidget2. However, we migrated back to the QvtkWidget and I have no clue why it is not working this time. If possible, this should be fixed for the current release.
I will check the following commits today:
-Integration of VTK 6.2
-Migrating back to QvtkWidget