Tree models and some bushes are black in-game...i fixed this on another map but not sure how,  ???

Ok,created a caulk texture box that covers the whole map in all dimensions,made it hollow,selected all the sides from the inside,went to textures -> sky,and used one of the textures.

There is another way to fix this,but i do not remember how
Anyways,thanks to HitmanVere for this alternative solution.