the problem I use mirror overlapping to get more space in UV for my modules, and for my light map I use separate UV. my problems with the normal map when I use mirror or symmetry UV I start to see seams . you can check my files.
Ok here images show how I do :
in softimage : http://i.imgur.com/HZpEAli.png
export : http://i.imgur.com/ZMM2OM4.png
Unreal setting : http://i.imgur.com/c4a3mUX.png
the problems :
the Files :
I will REALLY happy if you see the files and knows what the problem in it. I really try a lot and I hope find the solution here.