Kinda hard to explain, so here's the screenshots of it: The first picture is an overlay placed on 3 displacements , while the second is placed on 2. The black part only consists on one brush face but the overlay on that brush face isn't fully black, it's half-black. I tried Smoothing groups, cubemaps, cubemaps assigned on brush faces, additional lighting, but none seemed to work. So... any help on removing the black parts? Please?