Normal Mapping & mirroring Geometry problem

Red Crane

So i've been having some problems with my normal maps when i try to mirror or symmetry my geometry. it is having an inverse effect on my normal map which makes sense because i did jsut invert teh geometry, but i am curious if there is a fast way to fix this. I've tried inverting the green channel as per a comment i remember hearing froma friend. no luck. any suggestions would be helpful.

MoP

Posted a reply to something very similar to this over on CGChat this morning.

Check it out: http://www.cgchat.com/forum/showthread.php?s=&threadid=22944

Red Crane

Thanks MoP for replying so quick. I talked with Rockstar and he said the same thing, that our engine should compensate. So i've come to the conclusion that ours doesn't..yet. thanks again