Added a few more code comments about drawing levels.
Added a few more code comments about drawing levels.

iOSTestApps/bridges,nagyistoce/bridges,zgrossbart/bridges,iOSTestApps/bridges,iOSTestApps/bridges,iOSTestApps/bridges,nagyistoce/bridges,nagyistoce/bridges,zgrossbart/bridges,nagyistoce/bridges,zgrossbart/bridges