You guys need to provide traks. I just tested it myself: put an M1A2 on one side of a building, and a T80 on the other, facing each other. They might as well have been on different sides of the map, completely ignoring each other. I did three tests: Large building, small building, no building. The did not see through the buildings in the first 2 tests. Both reacted within seconds in the last test w/no buildings. Building test 1.trk Building test 2.trk Building test 3.trk