Index: binaries/data/mods/public/art/actors/props/structures/britons/barracks_struct1.xml
===================================================================
--- binaries/data/mods/public/art/actors/props/structures/britons/barracks_struct1.xml
+++ binaries/data/mods/public/art/actors/props/structures/britons/barracks_struct1.xml
@@ -5,12 +5,24 @@
     <variant frequency="100" name="Base">
       <mesh>props/brit_barracks_struct1.dae</mesh>
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-		<texture file="structural/ao/brit_barracks.png" name="aoTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+        <texture file="structural/ao/brit_barracks.png" name="aoTex"/>
+      </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>player_trans_ao_parallax_spec.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_armorstand_wood.xml
===================================================================
--- binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_armorstand_wood.xml
+++ binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_armorstand_wood.xml
@@ -11,5 +11,17 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>player_trans_parallax_spec.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_bucket_water.xml
===================================================================
--- binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_bucket_water.xml
+++ binaries/data/mods/public/art/actors/props/structures/celts/blacksmith_bucket_water.xml
@@ -5,9 +5,21 @@
     <variant frequency="1" name="barrels">
       <mesh>props/celt_blacksmith_bucket_water.dae</mesh>
       <textures>
-<texture file="structural/celt_struct_1.dds" name="baseTex"/>
-</textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>player_water.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/props/structures/celts/special.xml
===================================================================
--- binaries/data/mods/public/art/actors/props/structures/celts/special.xml
+++ binaries/data/mods/public/art/actors/props/structures/celts/special.xml
@@ -5,11 +5,23 @@
     <variant frequency="100" name="Base">
       <mesh>props/celt_sb_roof.dae</mesh>
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+      </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>player_trans_parallax_spec.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/props/structures/gauls/farmstead_struct1.xml
===================================================================
--- binaries/data/mods/public/art/actors/props/structures/gauls/farmstead_struct1.xml
+++ binaries/data/mods/public/art/actors/props/structures/gauls/farmstead_struct1.xml
@@ -5,12 +5,24 @@
     <variant name="gaul farmstead struct_1">
       <mesh>props/gaul_farmstead_struct1.dae</mesh>
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-		<texture file="structural/ao/gaul_civic_centre.png" name="aoTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+        <texture file="structural/ao/gaul_civic_centre.png" name="aoTex"/>
+      </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>player_trans_ao_parallax_spec.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/structures/carthaginians/embassy_celtic.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/carthaginians/embassy_celtic.xml
+++ binaries/data/mods/public/art/actors/structures/carthaginians/embassy_celtic.xml
@@ -17,6 +17,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_medium.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/barracks.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/barracks.xml
+++ binaries/data/mods/public/art/actors/structures/celts/barracks.xml
@@ -20,6 +20,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="ungarrisoned" frequency="1"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/civic_centre.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/civic_centre.xml
+++ binaries/data/mods/public/art/actors/structures/celts/civic_centre.xml
@@ -18,6 +18,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="ungarrisoned" frequency="1"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/dock.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/dock.xml
+++ binaries/data/mods/public/art/actors/structures/celts/dock.xml
@@ -17,6 +17,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>
   </group>
Index: binaries/data/mods/public/art/actors/structures/celts/farmstead.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/farmstead.xml
+++ binaries/data/mods/public/art/actors/structures/celts/farmstead.xml
@@ -11,14 +11,26 @@
         <prop actor="props/structures/decals/farmstead_mud.xml" attachpoint="root"/>
       </props>
       <textures>
-		<texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-		<texture file="structural/ao/celt_farmstead.png" name="aoTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+        <texture file="structural/ao/celt_farmstead.png" name="aoTex"/>
+      </textures>
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/homestead.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/homestead.xml
+++ binaries/data/mods/public/art/actors/structures/celts/homestead.xml
@@ -20,6 +20,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="ungarrisoned" frequency="1"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/house.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/house.xml
+++ binaries/data/mods/public/art/actors/structures/celts/house.xml
@@ -25,12 +25,24 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant frequency="1" name="texture">
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+      </textures>
     </variant>
   </group>
   <group>
Index: binaries/data/mods/public/art/actors/structures/celts/hut.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/hut.xml
+++ binaries/data/mods/public/art/actors/structures/celts/hut.xml
@@ -16,6 +16,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/kennel.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/kennel.xml
+++ binaries/data/mods/public/art/actors/structures/celts/kennel.xml
@@ -11,14 +11,26 @@
         <prop actor="props/structures/celts/kennel_beef.xml" attachpoint="root"/>
       </props>
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-		<texture file="structural/ao/celt_kennel.png" name="aoTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+        <texture file="structural/ao/celt_kennel.png" name="aoTex"/>
+      </textures>
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/market_newest.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/market_newest.xml
+++ binaries/data/mods/public/art/actors/structures/celts/market_newest.xml
@@ -12,13 +12,25 @@
         <prop actor="particle/smoke_light_delay.xml" attachpoint="smoke"/>
       </props>
       <textures>
-	    <texture file="structural/celt_struct_1.dds" name="baseTex"/>
-	    <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
-	    <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-	  </textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+        <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
+        <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
+      </textures>
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_medium.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/plot_corral.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/plot_corral.xml
+++ binaries/data/mods/public/art/actors/structures/celts/plot_corral.xml
@@ -19,6 +19,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant frequency="1" name="ungarrisoned"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/storehouse.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/storehouse.xml
+++ binaries/data/mods/public/art/actors/structures/celts/storehouse.xml
@@ -18,6 +18,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/celts/temple.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/celts/temple.xml
+++ binaries/data/mods/public/art/actors/structures/celts/temple.xml
@@ -18,11 +18,23 @@
         <texture file="structural/celt_struct_1.dds" name="baseTex"/>
         <texture file="structural/celt_struct_1_norm.png" name="normTex"/>
         <texture file="structural/celt_struct_1_spec.png" name="specTex"/>
-		<texture file="structural/ao/celt_temple.png" name="aoTex"/>
+        <texture file="structural/ao/celt_temple.png" name="aoTex"/>
       </textures>
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="ungarrisoned" frequency="1"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/fndn_celt_dock.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/fndn_celt_dock.xml
+++ binaries/data/mods/public/art/actors/structures/fndn_celt_dock.xml
@@ -14,5 +14,17 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
   <material>no_trans_norm_spec.xml</material>
 </actor>
Index: binaries/data/mods/public/art/actors/structures/gauls/civic_centre.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/gauls/civic_centre.xml
+++ binaries/data/mods/public/art/actors/structures/gauls/civic_centre.xml
@@ -19,6 +19,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="ungarrisoned" frequency="1"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/art/actors/structures/gauls/house.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/gauls/house.xml
+++ binaries/data/mods/public/art/actors/structures/gauls/house.xml
@@ -11,6 +11,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant frequency="1" name="gaul house a">
       <mesh>structural/gaul_house_a.dae</mesh>
       <props>
Index: binaries/data/mods/public/art/actors/structures/gauls/market.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/gauls/market.xml
+++ binaries/data/mods/public/art/actors/structures/gauls/market.xml
@@ -19,6 +19,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_medium.xml">
       <props>
Index: binaries/data/mods/public/art/actors/structures/gauls/scout_tower.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/gauls/scout_tower.xml
+++ binaries/data/mods/public/art/actors/structures/gauls/scout_tower.xml
@@ -34,6 +34,18 @@
     </variant>
   </group>
   <group>
+    <variant name="summer" frequency="1">
+      <textures>
+        <texture file="structural/celt_struct_1.dds" name="baseTex"/>
+      </textures>
+    </variant>
+    <variant name="winter" frequency="0">
+      <textures>
+        <texture file="structural/celt_struct_1_snow.dds" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <group>
     <variant frequency="1" name="ungarrisoned"/>
     <variant name="garrisoned">
       <props>
Index: binaries/data/mods/public/maps/skirmishes/alpine_valleys_2p.xml
===================================================================
--- binaries/data/mods/public/maps/skirmishes/alpine_valleys_2p.xml
+++ binaries/data/mods/public/maps/skirmishes/alpine_valleys_2p.xml
@@ -39,6 +39,7 @@
 	<ScriptSettings><![CDATA[
 {
   "AISeed": 0,
+  "SupportedBiomes": "generic/alpine",
   "AllyView": false,
   "CircularMap": true,
   "Description": "The high peaks and valleys of the Alps.\n\nEach player starts the match nestled in a safe green valley. Between lies the treacherous Alps mountain range.",
@@ -16216,4 +16217,4 @@
 		</Entity>
 	</Entities>
 	<Paths/>
-</Scenario>
\ No newline at end of file
+</Scenario>
Index: binaries/data/mods/public/simulation/components/BiomeManager.js
===================================================================
--- binaries/data/mods/public/simulation/components/BiomeManager.js
+++ binaries/data/mods/public/simulation/components/BiomeManager.js
@@ -0,0 +1,43 @@
+/**
+  * A manager class for biomes.
+  * @class
+  * @constructor
+  */
+function BiomeManager() {}
+
+/**
+ * Defines the XML schema and help strings of the manaager.
+ * @memberof BiomeManager
+ */
+BiomeManager.prototype.Schema =
+	"<a:component type='system'/><empty/>";
+
+/**
+ * Initializes the current map's biome.
+ * @memberof BiomeManager
+ */
+BiomeManager.prototype.Init = function()
+{
+    this.biome = "";
+}
+
+/**
+ * Sets the current map's biome.
+ * @param {string} biome - The new biome.
+ * @memberof BiomeManager
+ */
+BiomeManager.prototype.SetBiome = function(biome)
+{
+    this.biome = biome;
+}
+
+/**
+ * Returns the current map's biome.
+ * @memberof BiomeManager
+ */
+BiomeManager.prototype.GetBiome = function()
+{
+	return this.biome;
+}
+
+Engine.RegisterSystemComponentType(IID_BiomeManager, "BiomeManager", BiomeManager);
Index: binaries/data/mods/public/simulation/components/BiomeReplacer.js
===================================================================
--- binaries/data/mods/public/simulation/components/BiomeReplacer.js
+++ binaries/data/mods/public/simulation/components/BiomeReplacer.js
@@ -0,0 +1,83 @@
+/**
+  * A manager class for biomes.
+  * @class
+  * @constructor
+  */
+function BiomeReplacer() {}
+
+/**
+ * Defines the XML schema and help strings of the component.
+ * @memberof BiomeReplacer
+ */
+BiomeReplacer.prototype.Schema = `
+	<a:help>Defines the variants an entity can assume depending on a map biome.</a:help>
+	<a:example>
+		<Variants>
+			<Winter>
+				<AffectedBiomes datatype="tokens">generic/alpine</AffectedBiomes>
+				<ActorVariant>winter</ActorVariant>
+			</Winter>
+		</Variants>
+	</a:example>
+	<element name='Variants' a:help='Effect for having multiple builders.'>
+		<oneOrMore>
+			<element a:help='Element containing the variant data.'>
+				<anyName/>
+				<interleave>
+					<element name='AffectedBiomes' a:help='Names of the biomes affected byt this variant'>
+						<attribute name='datatype'>
+							<value>tokens</value>
+						</attribute>
+						<text/>
+					</element>
+					<element name='ActorVariant' a:help='Actor variant to switch to.'>
+						<text/>
+					</element>
+				</interleave>
+			</element>
+		</oneOrMore>
+	</element>`;
+
+/**
+ * Initializes the biome replacer.
+ * @memberof BiomeReplacer
+ */
+BiomeReplacer.prototype.Init = function()
+{
+
+}
+
+
+/**
+ * @param {{ "from": number, "to": number }} msg - Message containing the old new owner.
+ * @memberof BiomeReplacer
+ */
+BiomeReplacer.prototype.OnCreate = function(msg)
+{
+
+		const currentBiome = Engine.QueryInterface(SYSTEM_ENTITY, IID_BiomeManager)?.GetBiome();
+
+		if (!currentBiome)
+			return;
+
+		let cmpVisual = Engine.QueryInterface(this.entity, IID_Visual);
+
+		if (!cmpVisual)
+			return;
+
+		for (const variantName of Object.keys(this.template.Variants))
+		{
+			const variant = this.template.Variants[variantName];
+			if (!variant.AffectedBiomes || !variant.AffectedBiomes._string)
+				continue;
+
+			const affectedBiomes = variant.AffectedBiomes._string.split(" ");
+			if (affectedBiomes.indexOf(currentBiome) !== -1)
+			{
+				cmpVisual.SelectAnimation(variant.ActorVariant, false, 1.0);
+				return;
+			}
+		}
+};
+
+Engine.RegisterComponentType(IID_BiomeReplacer, "BiomeReplacer", BiomeReplacer);
Index: binaries/data/mods/public/simulation/components/interfaces/BiomeManager.js
===================================================================
--- binaries/data/mods/public/simulation/components/interfaces/BiomeManager.js
+++ binaries/data/mods/public/simulation/components/interfaces/BiomeManager.js
@@ -0,0 +1 @@
+Engine.RegisterInterface("BiomeManager");
Index: binaries/data/mods/public/simulation/components/interfaces/BiomeReplacer.js
===================================================================
--- binaries/data/mods/public/simulation/components/interfaces/BiomeReplacer.js
+++ binaries/data/mods/public/simulation/components/interfaces/BiomeReplacer.js
@@ -0,0 +1 @@
+Engine.RegisterInterface("BiomeReplacer");
Index: binaries/data/mods/public/simulation/helpers/InitGame.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/InitGame.js
+++ binaries/data/mods/public/simulation/helpers/InitGame.js
@@ -41,6 +41,11 @@
 			cmpRangeManager.ExploreMap(i);
 	}
 
+	if (settings.Biome)
+	{
+		Engine.QueryInterface(SYSTEM_ENTITY, IID_BiomeManager)?.SetBiome(settings.Biome);
+	}
+
 	const cmpAIManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_AIManager);
 	for (let i = 0; i < settings.PlayerData.length; ++i)
 	{
Index: binaries/data/mods/public/simulation/templates/special/filter/construction.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/special/filter/construction.xml
+++ binaries/data/mods/public/simulation/templates/special/filter/construction.xml
@@ -5,4 +5,5 @@
   <Ownership merge=""/>
   <Position merge=""/>
   <VisualActor merge=""/>
+  <BuildRestrictions merge=""/>
 </Entity>
Index: binaries/data/mods/public/simulation/templates/special/filter/preview.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/special/filter/preview.xml
+++ binaries/data/mods/public/simulation/templates/special/filter/preview.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity filtered="">
+  <BiomeReplacer merge=""/>
   <!-- We only want to include components which are necessary (for the visual previewing of an entity)
        and safe (i.e. won't do anything that affects the synchronised simulation state), so additions
        to this list should be carefully considered -->
Index: binaries/data/mods/public/simulation/templates/structures/gaul/house.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/structures/gaul/house.xml
+++ binaries/data/mods/public/simulation/templates/structures/gaul/house.xml
@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_structure_civic_house">
+  <BiomeReplacer>
+    <Variants>
+      <Winter>
+        <AffectedBiomes datatype="tokens">generic/alpine</AffectedBiomes>
+        <ActorVariant>winter</ActorVariant>
+      </Winter>
+    </Variants>
+  </BiomeReplacer>
   <Identity>
     <Civ>gaul</Civ>
     <SpecificName>Tegia</SpecificName>