Hi I am usually never experiencing this problem but I am right now only for a piece ...
I have a couple of greaves done in zbrush they are convex on the exterior and slightly convace in the interior ... the problem is that the normal map backed in xnormal maes the opposite seem or better it seems to do ok interior side but exterior seems to make an upverted normal map , like a concave surface instead than convex ... I tried all settings and exported with different smoothing groups the low poly but still I get upverted convexity ... how can this be fixed or what could be due to?
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so on left the High poly mesh on right the low poly on center the cage , low bottom the result ingame and on top left and right how looks ingame , as you can see the normal maps look like concave rather than convex ...
Take it easy.