Fortress Armor Upgrade Texture for Snow Maps
With the exception of Mordor, most fortresses, expansions, and walls lose their 'snow look' after the player purchases the relevant fortress armor upgrade.
Vanilla .big files already have upgraded snow textures for Men, Elves, and Isengard that could be used. Dwarves (plus summoned Citadel/Tower), Goblins, and Angmar do not have such snow textures.
Note: Goblins Burrows Expansion is currently missing its snow texture in all forms.
Edited by Sentiomax