Surface half black (ApexSDK to Unreal)

Well, as the topic suggested, we have some issues importing cloth from ApexSDK into UnrealEngine. The cloth physic works fine, but half of the cloth surface always turn black for some weird reason.
We spent almost three days trying to get this to work now…

Anyone got any clue to this?

Could you check that tangent space vectors are generated correctly?

and could you probably repost the image, because atm we can’t see much :wink:

Is it black after you have rebuild the light or even right after you have placed it into the level?