ETS2 - Weather Mod V5.3 (1.37.x)

Fixed lack of HDR
The colors and fogs at sunrise / sunset have changed, the behavior of the fog has changed, the mat files of the skybox model have changed.
Lost textures fixed.

* Fixed definitions for correct operation with 1.36 and 1.37 OB.
* All textures are converted to DX11 and everything works fine on 1.36 and 1.37 OB.

Authors: Piva, Catalin V