Problem with POM(Parallax Occlusion Mapping) + Decal Actor

[BananableOffense]

Unfortunately…
Per Ryan Brucks, the tech artist who authored the POM node in Unreal,

POM material

It doesn’t really make sense to use pixel depth offset with decals when you think about it. Pixel depth offset is designed to reveal accurate intersection with other geometry. So if you have a solid floor or wall and put a decal (or floating plane) and then use pixel depth offset to push the pixels down, by definition you will reveal the underlying floor or wall, unless you float the decal or plane away from the surface as you found. If you want a decal that can appear to make a hole I think th…

Not only that, PDO doesn’t effect shadow casting, so even if you did manage to get it to work somehow - if the decal was on a shadow casting object, the receiving objects surface would fill the dent with shadow.