I've seen a couple of posts linking people to youtube videos, which is good as it gives an idea of what to do but not specific to settings needed for gta 5 and they dont explain what theyre for or what you need on the map for gta5 either

 

Edited April 6, 201610 yr by festivalmatt
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Create a bump texture for GTA 5

Normal Map (bump) - a texture, in which color channels the vector is stored information about the bias point high-poly model is relatively low-poly model. normal map is computed for each pixel of the texture. RGB values of each of the channels - it is a normal pixel XYZ coordinates.
- Red channel determines the horizontal (X-axis coordinates) vector.
- Green channel defines the vertical (Y-axis coordinate) vector.
- Blue channel determines the height (Z-coordinate axis) vector

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wrong texture which was created with Nvidia Normal Plughin for Photoshop without edited setting

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wrong texture in the game

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And it's not just that there is a relief to us unnecessary areas. They can always cover up before applying the filter. But note that at least at the very inscription «EXL 6239". She is depressed, it should be convex. The reason for the failure is simple and lies in the fact that the filter operates on the difference in brightness. And a dark inscription was pushed relatively light background.

Thus, most of the texture you want to edit need to be edited before use a filter. In fact, you must first create a black and white map of heights. The meaning is simple - the whiter the area, the higher it is on the surface.

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Flatten all the layers into a common background and now applies the filter:

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Scale (1) - height scale for normal maps. Over this parameter has a number of switches of detail (2). By selecting these two parameters can either be more detailed, map or deeper. Reverse channels (3) is not necessary.

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Save the bump texture in dds (DXT1 without alpha channel) format.
The result in the game:

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This is was a article for gta 4, but in the gta 5 bump techinuqie not changed
Copyright Am-team, translated and edited by me.

Thats great, thank you very much @Desmond98 , very much appreciated!

Just now, festivalmatt said:

Thats great, thank you very much @Desmond98 , very much appreciated!

btw, i forgot about speculars, black color- full matte ingame, no any reflection, white- the maximum reflection, so then lighter specular then more reflections, and if texture darkers then less reflection

Just now, Desmond98 said:

btw, i forgot about speculars, black color- full matte ingame, no any reflection, white- the maximum reflection, so then lighter specular then more reflections, and if texture darkers then less reflection

I think i get that. Definately explains some of the results from stuff that i tried.