The only way you will get hat effect that u want is through FX shaded mods or renderstyle because that's the.files.that the game uses to render light and texture on objects
On newer games that you see today, if u ever go into texture editing (I did on guitar hero 3), you notice this kind of texture file, as well as a normal texture...
That is the bump map of a brick wall on gh3...if I browsed further I would also fi.d the normal texture that's red and brown and such...but im lazy
Bump map images, such as the above, are the present day game engine renderstyles of the past lithtect jupiter engine of its time. That image shows where the wall should be brighter/darker.
In short, no u can't do it with just CA texture edits. But on most newer games, you can. (Battlefield p4f uses that type of bump mappig)
Originally Posted by aeronyx
, I was wondering if I could do it to a gun skin. ;/
Im not sure about modding files but editing the Memory during game is easy an pretty easy to find out what is what i found out how to do this from halo 2 i was a big moder / hacker for that making coop online 
