ok so i'm getting this really strange result when trying to use a normal map in a material instance:
the material on the right is just the normal map plugged into the normal slot as usual and works fine. the one of the left is a 2d parameter plugged into the normal and then uses the same normal map. the weird lighting is happening along the uv map edges but i cant see any reason why! this isnt the first mesh i used the master material instance on and i didnt have any issues with the first?
any thoughts people?