Why do the "invisable" enclosure walls (that go through a river or to the edge of a cliff) need a smooth terrain? It's not like there is something really going to get build so the terrain does not need to be smooth.
Yep annoying as heck and I complained about that in beta. You also can't modify terrain around them, as they act like normal barriers and force the terrain to remain "pinned" around the null barrier unless you use the "cheat" (I consider it as such) option in the game settings.
For sure. I just ran into an issue with this because I put a null barrier down to mark my Tiger pit. But one of them stepped just slightly through the barrier with 1 foot and the alarms started going off >.>