Dinohtar

When im building my own mission in the editor i run into a problem. When i use the crass cutter tool to clear the grass from my base or something. AI refuses to walk over the cleared area. They walk in and then stop or just dont move at all. Dosnt matter if i set waypoints or anything else. When i remove the grass cutter everything is fine and they just walk the way i tell them to. Anybody encountered this or has a solution for it?

Oke thanks

Is it possible to only show this at night? And does anybody know how to implement this into dayz?