I understand how light mapping works and how Unreal deals with it in the editor, and even with a good light map layout for my modular asset (its just a wall), when I place them next to each other, there are visible seams. I have been able to reduce the amount visible, but not erase it. Yes, I have made sure that the pieces in the light map have space, and yes I have made sure that Unreal is using the light map I made for it. I even adjusted the Indirect Lighting Quality and Indirect Lighting Smoothness to make the seams somewhat fade, but not completely. So my question is: Is there really no way to get rid of such a simple problem? And if so, what are the best ways I can hide it?