I don't know what you can do but some stuff lose there textures even after you have it in working fine then you would reload skyline and the texture is gone and you cant edit the material to put it back on tells you to buy the original model/textures hahah below is a video i made to show you ways it could be improved
You will see that there are 2 models that use the same textures and it creates 1 material file per defuse unlike skyline that uses per mesh file and if you add the normal and spec it puts it on every single model that uses that texture/material where skyline you have to do every single one individually you could imagine if you have say 30+ trees how long it would take in skyline where that other way is seconds most engines do it this way is there a reason why skyline does it per mesh also its a bit


