Yes, you need to organize them into 0-1 space PER Unreal Object. So if the house is all 1 object, that is placed on its own (ideally) in udk, it needs to retain it own 2nd channel uv set. Judging by your screenshot. House 1 object, Barrel 1 object, Board 1 object. Or if you're using a modular approach. Support beam +…