Its bumping up the specular map, I believe. Someone here did something similar ages ago.
I think the skin system need a major rework as well. The idea of having overlays that put details like rivets and markings like no step and refueling port on a plane is great... except not every plane had those markings.
Ideally the skin system should allow custom overlay and specular/normal dds textures to be stuck in a subfolder of the aircrafts skin folder. Then any skiin placed in that subfolder would load with the override markings, wear, ect textures in that same folder.
You could easily release skins with custom sets of wear and dds textures that wouldn't rely on the games defaults - just drop the folder in and load it in-game.
Or people could make "shiny" specular maps like seen above. Then just drop any skin you want to use with that custom specular into the subfolder.
I hope my explanation is clear enough. As of right now its the easiest way I can see them fixing the situation of skins without breaking everything thats been made up until now.
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