Hi. I described my problem here:
https://forums.unrealengine.com/showthread.php?135643-Normal-Map-and-Green-Channel
So there is some problems with ZB default NormalRGBMat, which gives somehow inverted results in UE4.
Then i found this:
http://www.zbrushcentral.com/showthread.php?88435-Fixed-NormalRGBMat-amp-MatCap-Normal-Shader
Results are better with this new one, but can i trust it? Is it perfect or best result for replacing native Mat? Or is there some settings which can be adjusted in ZB which affects how this NormalRGBMat behaves?
Thx for the help!