Hello Virtual_Francky

I think I understand but my rendering program does not generate UV maps and I need a program that generates UV maps, Michael has listed some programs that can generate them but the demos do not allow the export of the map (you cannot save) so I couldn't test the program and the resulting map .... so I couldn't create anything.

Now I simply used a dirt map to simulate the dirty bodywork but it is not the same as a 3d painter in my opinion .... the effect is much more unreal than a dedicated map