shadows and textures problem

since the last update, i've a problem with the shadows on some textures, in my map mod "atoll"
http://www.beamng.com/threads/atoll.22104/


as you can see, there is a lot of black horizontal line not beautifull
textures in jpg or png
only those who are on a horizontal plan. some textures works , some other no ...

it is someone for help me ?? how correct this, please?

((in the doubt, we have tried to clear the cache, but that does nothing. just erase the levels folder in wich there are my maps in creation.... fortunatly, i've copies ( bad remembrances )))
--- Post updated ---
same problem on my other map. in more some texture have desappear

 

I think that's Z-fighting. Two parts of the 3D model laying exactly over each other, making the textures conflict ("fight" for which one is seen). If it's that you can fix it by opening the 3D model and remove all double faces.

 

same problem on my other map. in more some texture have desap

i will look but i don't think it's this. this happens too on mesh road. this happens on near all the 3d models on the horinzontal faces in the shadows

 

problem solved .... i believe

concerning the bugs with the shadows under some mesh roads, I've added a normal texture

concerning the bugs with the shadows with some 3d models, add normal textures doesn't works. However, i have notice that one same model, used in differente configurations, could to well work or not. The only difference was the scale. So, in setting the z-scale at a certain value, bigger or smaller, that's works. (1.001 instead 1 by example).

I suppose it come from the light, something has certainly changed.