@DeathstrokeFTW LVG is on point with the video. And where you place decals inside decal sheet does not matter as long as they don't overlap. And on the mesh you just place them where ever they make sense.
Awesome work! Did you model the corridor in one piece and then cut it up or did you plan a modular setup right from start? Which UE4 decal material are you using - translucent/translucent or dbuffer decals? I´m learning how to set up my mesh decals and started to use a translucent/translucent material, because I can have…