Actually none of my uv pieces are mirrored. You'll see why in the picture i post just after. To bake the normal, diffuse, etc, i use xnormal and the tool ray distance calculator for the cage (I exported the high poly and his polypaint, i made a low poly and the uv's on max). And thank you for your help :)
Hi polycount ! I'm not very experimented, so i have some little problems during my exploration of differents workflow. For the moment, the thing is the seams f my mesh... I did a quick sketch in zbrush because i wanted experiment zbrush to unreal workflow. I think it's a beginner's probleme, it's why i'm asking to you…