Add dynamic selection of tree texture based on season and snow level.

All tree texture sheets now contain 4 different texture sets for
different conditions.  See Docs/README.materials for details.

Also retire the -summer and -winter variants of tree textures, which
are now redundant.

Docs/README.materials

@@ -109,8 +109,13 @@ tree-range-m : The range at which trees become visible. Note that this
          is not absolute, as trees are loaded in blocks. A lower number means
          trees will not become visible until you are closer.
 
-tree-texture : A texture to use for the trees. Typically this will be a
+tree-texture : A texture to use for the trees. Typically this will contain around
-         strip with multiple tree textures.
+         8 different trees in a row, duplicate 4 times. From bottom to top, the
+         rows contain
+         * summer textures
+         * snow texture
+         * winter texture
+         * winter snow texture
 
 tree-varieties : The number of different trees defined in the tree-texture
          horizontally. (default: 1)
@@ -233,3 +238,6 @@ building-texture : The texture used for all buildings. See Docs/buildings.png fo
 
 building-lightmap: Emissive texture for all buildings, which is faded in at night to provide
 illusion of lit windows.  Same texture coordinates and format at building-texture above.
+
+building-range-m: Range at which all buildings are visible.  Beyond this point fewer and fewer
+          buildings are rendered, with no buildings rendered at 2*building-range-m (default 10000)

Effects/tree.eff

@@ -25,13 +25,14 @@
 		<terminator><use>/environment/terminator-relative-position-m</use></terminator>
 		<fogtype><use>/sim/rendering/shaders/skydome</use></fogtype>
 		<terrain_alt><use>/environment/mean-terrain-elevation-m</use></terrain_alt>
-  	        <overcast><use>/rendering/scene/overcast</use></overcast>
+		<overcast><use>/rendering/scene/overcast</use></overcast>
-    	        <eye_alt><use>/sim/rendering/eye-altitude-m</use></eye_alt>
+		<eye_alt><use>/sim/rendering/eye-altitude-m</use></eye_alt>
 		<snow_level><use>/environment/snow-level-m</use></snow_level>
+		<season><use>/environment/tree-season</use></season>
 		<dust_cover_factor><use>/environment/surface/dust-cover-factor</use></dust_cover_factor>
 		<fogtype><use>/sim/rendering/shaders/skydome</use></fogtype>
 		<fogstructure><use>/environment/fog-structure</use></fogstructure>
-   		<quality_level><use>/sim/rendering/shaders/landmass</use></quality_level>
+		<quality_level><use>/sim/rendering/shaders/landmass</use></quality_level>
 		<!-- 	END fog include -->
 	</parameters>
 
@@ -123,9 +124,19 @@
         <value><use>eye_alt</use></value>
       </uniform>
       <uniform>
-	<name>dust_cover_factor</name>
+        <name>dust_cover_factor</name>
-	<type>float</type>
+        <type>float</type>
-	<value>	<use>dust_cover_factor</use></value>
+        <value><use>dust_cover_factor</use></value>
+      </uniform>
+      <uniform>
+        <name>snow_level</name>
+        <type>float</type>
+        <value><use>snow_level</use></value>
+      </uniform>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
       </uniform>
       <uniform>
         <name>texture</name>
@@ -138,9 +149,9 @@
         <value>2</value> <!-- AMBIENT_AND_DIFFUSE -->
       </uniform>
      <uniform>
-	<name>quality_level</name>
+      <name>quality_level</name>
-	<type>int</type>
+      <type>int</type>
-	<value>	<use>quality_level</use></value>
+      <value><use>quality_level</use></value>
      </uniform>
     </pass>
   </technique>
@@ -235,9 +246,19 @@
         <value><use>eye_alt</use></value>
       </uniform>
       <uniform>
-	<name>dust_cover_factor</name>
+        <name>dust_cover_factor</name>
-	<type>float</type>
+        <type>float</type>
-	<value>	<use>dust_cover_factor</use></value>
+        <value><use>dust_cover_factor</use></value>
+      </uniform>
+      <uniform>
+        <name>snow_level</name>
+        <type>float</type>
+        <value><use>snow_level</use></value>
+      </uniform>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
       </uniform>
       <uniform>
         <name>texture</name>
@@ -250,9 +271,9 @@
         <value>2</value> <!-- AMBIENT_AND_DIFFUSE -->
       </uniform>
      <uniform>
-	<name>quality_level</name>
+      <name>quality_level</name>
-	<type>int</type>
+      <type>int</type>
-	<value>	<use>quality_level</use></value>
+      <value><use>quality_level</use></value>
      </uniform>
     </pass>
   </technique>
@@ -290,6 +311,11 @@
 				<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
 				<fragment-shader>Shaders/gbuffer-encode.frag</fragment-shader>
 			</program>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
+      </uniform>
 			<uniform>
 				<name>texture</name>
 				<type>sampler-2d</type>
@@ -382,6 +408,11 @@
 					<use>fogtype</use>
 				</value>
 			</uniform>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
+      </uniform>
 			<!-- 			END fog include -->
 		</pass>
 	</technique>
@@ -471,6 +502,11 @@
 					<use>fogtype</use>
 				</value>
 			</uniform>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
+      </uniform>
 			<!-- 			END fog include -->
 		</pass>
 
@@ -558,6 +594,11 @@
 					<use>fogtype</use>
 				</value>
 			</uniform>
+      <uniform>
+        <name>season</name>
+        <type>int</type>
+        <value><use>season</use></value>
+      </uniform>
 		</pass>
 	</technique>
 </PropertyList>

Environment/local-weather-rules.xml

@@ -751,4 +751,54 @@
     <output>/environment/mean-terrain-elevation-m</output>
   </filter>
   
+  <!-- Tree "season" - used to determine whether to display the trees in summer or winter foliage -->
+  <filter>
+    <name>EnvironmentInterpolator:Trees:Season:Summer</name>
+    <type>gain</type>
+    <enable>
+      <condition>
+        <not>
+          <or>
+            <equals>
+              <property>sim/startup/season</property>
+              <value>winter</value>
+            </equals>
+            <greater-than>
+              <property>/environment/season</property>
+              <value>1.5</value>
+            </greater-than>
+          </or>
+        </not>
+      </condition>
+    </enable>
+    <input>
+      <value>0.0</value>
+    </input>
+    <output>/environment/tree-season</output>
+  </filter>
+
+
+  <filter>
+    <name>EnvironmentInterpolator:Trees:Season:Winter</name>
+    <type>gain</type>
+    <enable>
+      <condition>
+        <or>
+          <equals>
+            <property>sim/startup/season</property>
+            <value>winter</value>
+          </equals>
+          <greater-than>
+            <property>/environment/season</property>
+            <value>1.5</value>
+          </greater-than>
+        </or>
+      </condition>
+    </enable>
+    <input>
+      <value>1.0</value>
+    </input>
+    <output>/environment/tree-season</output>
+  </filter>
+  
 </PropertyList>

Materials/base/materials-base.xml

@@ -16,9 +16,15 @@ Shared parameters for various materials.
 -->
  <params>
   <forest>
-   <!-- Maximum distance from which a tree is visible -->
+    <!-- Maximum distance from which all trees are visible. -->
-   <tree-range-m>8000</tree-range-m>
+    <!-- Some trees will be visible to twice this range  -->
+    <tree-range-m>8000</tree-range-m>
   </forest>
+  <building>     
+    <!-- Maximum distance from which all buildings are visible -->
+    <!-- Some buildings will be visible to twice this range. -->
+    <building-range-m>10000</building-range-m>
+  </building>  
  </params>
 
  <!-- Signage -->

Materials/dds/materials.xml

@@ -678,7 +678,7 @@
   <ysize>500</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.dds</tree-texture>
+  <tree-texture>Trees/coniferous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -702,7 +702,7 @@
   <ysize>500</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.dds</tree-texture>
+  <tree-texture>Trees/coniferous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -726,7 +726,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -751,7 +751,7 @@
   <ysize>500</ysize>
   <light-coverage>5000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -775,7 +775,7 @@
   <ysize>500</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.dds</tree-texture>
+  <tree-texture>Trees/coniferous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -798,7 +798,7 @@
   <ysize>500</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.dds</tree-texture>
+  <tree-texture>Trees/coniferous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>15.0</tree-height-m>
@@ -912,8 +912,9 @@
   <building-small-max-depth-m>30.0</building-small-max-depth-m>
   <building-medium-ratio>0.6</building-medium-ratio>
   <building-large-ratio>0.2</building-large-ratio>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -958,8 +959,9 @@
   <building-small-max-depth-m>30.0</building-small-max-depth-m>
   <building-medium-ratio>0.6</building-medium-ratio>
   <building-large-ratio>0.2</building-large-ratio>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>25000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1026,8 +1028,9 @@
   <building-medium-ratio>0.1</building-medium-ratio>
   <building-large-ratio>0.0</building-large-ratio>
   <building-medium-max-floors>4</building-medium-max-floors>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1312,7 +1315,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>2000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1351,7 +1354,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>2000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1398,7 +1401,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>2000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1426,7 +1429,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>500000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1472,7 +1475,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>2000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1512,7 +1515,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1543,7 +1546,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>2000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.dds</tree-texture>
+  <tree-texture>Trees/mixed.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1593,7 +1596,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1618,7 +1621,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-winter.png</tree-texture>
+  <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1644,7 +1647,7 @@
   <ysize>2000</ysize>
   <light-coverage>5000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1667,7 +1670,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1689,7 +1692,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>15.0</tree-height-m>
@@ -1749,7 +1752,7 @@
   <shininess>1.2</shininess>
   <light-coverage>20000000.0</light-coverage>
   <wood-coverage>8000.0</wood-coverage>
-    <tree-texture>Trees/mixed-shrub-winter.png</tree-texture>
+    <tree-texture>Trees/mixed-shrub.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>2.0</tree-height-m>
@@ -1798,8 +1801,9 @@
   <building-small-max-depth-m>30.0</building-small-max-depth-m>
   <building-medium-ratio>0.6</building-medium-ratio>
   <building-large-ratio>0.2</building-large-ratio>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>250000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1859,8 +1863,9 @@
   <building-medium-ratio>0.1</building-medium-ratio>
   <building-large-ratio>0.0</building-large-ratio>
   <building-medium-max-floors>4</building-medium-max-floors>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -2125,7 +2130,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2161,7 +2166,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2196,7 +2201,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-winter.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2223,7 +2228,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>150000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-winter.dds</tree-texture>
+  <tree-texture>Trees/deciduous.dds</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2265,7 +2270,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>500000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-winter.png</tree-texture>
+  <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2304,7 +2309,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-winter.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2331,7 +2336,7 @@
   <bumpiness>0.7</bumpiness>
   <load-resistance>10</load-resistance>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>

Materials/default/materials.xml

@@ -638,7 +638,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -664,7 +664,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -692,7 +692,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.png</tree-texture>
+  <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -719,7 +719,7 @@
   <ysize>2000</ysize>
   <light-coverage>5000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -743,7 +743,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -766,7 +766,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-summer.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>15.0</tree-height-m>
@@ -878,8 +878,9 @@
   <building-small-max-depth-m>30.0</building-small-max-depth-m>
   <building-medium-ratio>0.6</building-medium-ratio>
   <building-large-ratio>0.2</building-large-ratio>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>250000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -938,8 +939,9 @@
   <building-medium-ratio>0.1</building-medium-ratio>
   <building-large-ratio>0.0</building-large-ratio>
   <building-medium-max-floors>4</building-medium-max-floors>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1233,7 +1235,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1270,7 +1272,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1305,7 +1307,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1332,7 +1334,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1375,7 +1377,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>150000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1414,7 +1416,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1443,7 +1445,7 @@
   <bumpiness>0.7</bumpiness>
   <load-resistance>10</load-resistance>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1474,7 +1476,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1501,7 +1503,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-winter.png</tree-texture>
+  <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1527,7 +1529,7 @@
   <ysize>2000</ysize>
   <light-coverage>5000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1550,7 +1552,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1572,7 +1574,7 @@
   <ysize>1000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/coniferous-winter.png</tree-texture>
+  <tree-texture>Trees/coniferous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>15.0</tree-height-m>
@@ -1631,7 +1633,7 @@
   <shininess>1.2</shininess>
   <light-coverage>20000000.0</light-coverage>
   <wood-coverage>8000.0</wood-coverage>
-  <tree-texture>Trees/mixed-shrub-winter.png</tree-texture>
+  <tree-texture>Trees/mixed-shrub.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>2.0</tree-height-m>
@@ -1678,8 +1680,9 @@
   <building-small-max-depth-m>30.0</building-small-max-depth-m>
   <building-medium-ratio>0.6</building-medium-ratio>
   <building-large-ratio>0.2</building-large-ratio>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>250000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1738,8 +1741,9 @@
   <building-medium-ratio>0.1</building-medium-ratio>
   <building-large-ratio>0.0</building-large-ratio>
   <building-medium-max-floors>4</building-medium-max-floors>
+  <building-range-m alias="/params/building/building-range-m"/>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -2020,7 +2024,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2056,7 +2060,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2090,7 +2094,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2117,7 +2121,7 @@
   <light-coverage>2000000.0</light-coverage>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>10000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2159,7 +2163,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>150000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2198,7 +2202,7 @@
   <bumpiness>0.3</bumpiness>
   <load-resistance>1e30</load-resistance>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2226,7 +2230,7 @@
   <bumpiness>0.7</bumpiness>
   <load-resistance>10</load-resistance>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/mixed-winter.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>

Materials/regions/materials.xml

@@ -796,7 +796,7 @@
     <ysize>2000</ysize>
     <light-coverage>5000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -822,7 +822,7 @@
     <ysize>2000</ysize>
     <light-coverage>4000000.0</light-coverage>
     <wood-coverage>25000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -875,7 +875,7 @@
     <load-resistance>1e30</load-resistance>
     <!--<object-group include="Materials/base/farm-buildings.xml"/>-->
     <wood-coverage>120000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -905,7 +905,7 @@
     <load-resistance>1e30</load-resistance>
     <light-coverage>2000000.0</light-coverage>
     <wood-coverage>80000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -931,7 +931,7 @@
     <ysize>2000</ysize>
     <light-coverage>5000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -992,7 +992,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -1146,7 +1146,7 @@
     <building-medium-ratio>0.1</building-medium-ratio>
     <building-large-ratio>0.0</building-large-ratio>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -1274,7 +1274,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -1323,7 +1323,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <!--<wood-coverage>800000.0</wood-coverage>
-  <tree-texture>Trees/deciduous-summer.png</tree-texture>
+  <tree-texture>Trees/deciduous.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -1603,7 +1603,7 @@
   <load-resistance>1e30</load-resistance>
   <object-group include="Materials/base/farm-buildings.xml"/>
   <wood-coverage>5000.0</wood-coverage>
-  <tree-texture>Trees/mixed-summer.png</tree-texture>
+  <tree-texture>Trees/mixed.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -1783,7 +1783,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -1819,7 +1819,7 @@
     <load-resistance>1e30</load-resistance>
     <!--<object-group include="Materials/base/farm-buildings.xml"/>-->
     <wood-coverage>120000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -1887,7 +1887,7 @@
     <load-resistance>1e30</load-resistance>
     <wood-coverage>5000.0</wood-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -1918,7 +1918,7 @@
     <building-medium-ratio>0.6</building-medium-ratio>
     <building-large-ratio>0.2</building-large-ratio>
     <wood-coverage>250000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -1946,7 +1946,7 @@
     <building-large-ratio>0.0</building-large-ratio>
     <building-medium-max-floors>4</building-medium-max-floors>
     <wood-coverage>1000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2002,7 +2002,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2029,7 +2029,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2095,7 +2095,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2156,7 +2156,7 @@
     <light-coverage>2000000.0</light-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>2000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2194,7 +2194,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>2000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2238,7 +2238,7 @@
     <load-resistance>1e30</load-resistance>
     <wood-coverage>5000.0</wood-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2297,7 +2297,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2320,7 +2320,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>2000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2352,7 +2352,7 @@
     <building-medium-ratio>0.6</building-medium-ratio>
     <building-large-ratio>0.2</building-large-ratio>
     <wood-coverage>25000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2380,7 +2380,7 @@
     <building-large-ratio>0.0</building-large-ratio>
     <building-medium-max-floors>4</building-medium-max-floors>
     <wood-coverage>1500.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -2462,7 +2462,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2486,7 +2486,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>35.0</tree-height-m>
@@ -2527,7 +2527,7 @@
     <bumpiness>0.15</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>70000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2552,7 +2552,7 @@
     <bumpiness>0.7</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2577,7 +2577,7 @@
     <load-resistance>1e30</load-resistance>
     <light-coverage>2000000.0</light-coverage>
     <wood-coverage>50000.0</wood-coverage>
-    <tree-texture>Trees/tropical-summer.png</tree-texture>
+    <tree-texture>Trees/tropical.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2644,7 +2644,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/tropical-summer.png</tree-texture>
+  <tree-texture>Trees/tropical.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>35.0</tree-height-m>
@@ -2730,7 +2730,7 @@
   <load-resistance>1e30</load-resistance>
   <light-coverage>2000000.0</light-coverage>
   <wood-coverage>50000.0</wood-coverage>
-  <tree-texture>Trees/tropical-summer.png</tree-texture>
+  <tree-texture>Trees/tropical.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>20.0</tree-height-m>
@@ -2759,7 +2759,7 @@
   <building-large-ratio>0.0</building-large-ratio>
   <building-medium-max-floors>4</building-medium-max-floors>
   <wood-coverage>1000.0</wood-coverage>
-  <tree-texture>Trees/tropical-alt-summer.png</tree-texture>
+  <tree-texture>Trees/tropical-alt.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>15.0</tree-height-m>
@@ -2782,7 +2782,7 @@
   <ysize>2000</ysize>
   <light-coverage>10000000.0</light-coverage>
   <wood-coverage>4000.0</wood-coverage>
-  <tree-texture>Trees/tropical-summer.png</tree-texture>
+  <tree-texture>Trees/tropical.png</tree-texture>
   <tree-varieties>8</tree-varieties>
   <tree-range-m alias="/params/forest/tree-range-m"/>
   <tree-height-m>25.0</tree-height-m>
@@ -2828,7 +2828,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-summer.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2855,7 +2855,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-summer.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2880,7 +2880,7 @@
     <ysize>2000</ysize>
     <light-coverage>5000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2906,7 +2906,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-summer.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -2930,7 +2930,7 @@
     <ysize>1000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-summer.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -2953,7 +2953,7 @@
     <ysize>1000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-summer.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -3085,7 +3085,7 @@
     <building-medium-ratio>0.6</building-medium-ratio>
     <building-large-ratio>0.2</building-large-ratio>
     <wood-coverage>250000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3146,7 +3146,7 @@
     <building-large-ratio>0.0</building-large-ratio>
     <building-medium-max-floors>4</building-medium-max-floors>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3476,7 +3476,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3514,7 +3514,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3549,7 +3549,7 @@
     <light-coverage>2000000.0</light-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3576,7 +3576,7 @@
     <light-coverage>2000000.0</light-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3621,7 +3621,7 @@
     <bumpiness>0.3</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>150000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3660,7 +3660,7 @@
     <bumpiness>0.3</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3689,7 +3689,7 @@
     <bumpiness>0.7</bumpiness>
     <load-resistance>10</load-resistance>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/mixed-summer.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3722,7 +3722,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-winter.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3749,7 +3749,7 @@
     <ysize>2000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/deciduous-winter.png</tree-texture>
+    <tree-texture>Trees/deciduous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3775,7 +3775,7 @@
     <ysize>2000</ysize>
     <light-coverage>5000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3798,7 +3798,7 @@
     <ysize>1000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-winter.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -3820,7 +3820,7 @@
     <ysize>1000</ysize>
     <light-coverage>10000000.0</light-coverage>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/coniferous-winter.png</tree-texture>
+    <tree-texture>Trees/coniferous.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>15.0</tree-height-m>
@@ -3879,7 +3879,7 @@
     <shininess>1.2</shininess>
     <light-coverage>20000000.0</light-coverage>
     <wood-coverage>8000.0</wood-coverage>
-    <tree-texture>Trees/mixed-shrub-winter.png</tree-texture>
+    <tree-texture>Trees/mixed-shrub.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>2.0</tree-height-m>
@@ -3927,7 +3927,7 @@
     <building-medium-ratio>0.6</building-medium-ratio>
     <building-large-ratio>0.2</building-large-ratio>
     <wood-coverage>250000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -3987,7 +3987,7 @@
     <building-large-ratio>0.0</building-large-ratio>
     <building-medium-max-floors>4</building-medium-max-floors>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>25.0</tree-height-m>
@@ -4268,7 +4268,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4304,7 +4304,7 @@
     <load-resistance>1e30</load-resistance>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4338,7 +4338,7 @@
     <light-coverage>2000000.0</light-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4365,7 +4365,7 @@
     <light-coverage>2000000.0</light-coverage>
     <object-group include="Materials/base/farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4407,7 +4407,7 @@
     <bumpiness>0.3</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>150000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4446,7 +4446,7 @@
     <bumpiness>0.3</bumpiness>
     <load-resistance>1e30</load-resistance>
     <wood-coverage>5000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>
@@ -4474,7 +4474,7 @@
     <bumpiness>0.7</bumpiness>
     <load-resistance>10</load-resistance>
     <wood-coverage>4000.0</wood-coverage>
-    <tree-texture>Trees/mixed-winter.png</tree-texture>
+    <tree-texture>Trees/mixed.png</tree-texture>
     <tree-varieties>8</tree-varieties>
     <tree-range-m alias="/params/forest/tree-range-m"/>
     <tree-height-m>20.0</tree-height-m>

Shaders/deferred-tree.vert

@@ -5,6 +5,8 @@
 // color - xyz of tree quad origin, replicated 4 times.
 #version 120
 
+uniform int season;
+
 void main() {
 
     // Texture coordinates
@@ -12,6 +14,7 @@ void main() {
     float texFract = floor(fract(gl_MultiTexCoord0.x) * numVarieties) / numVarieties;
     texFract += floor(gl_MultiTexCoord0.x) / numVarieties;
     gl_TexCoord[0] = vec4(texFract, gl_MultiTexCoord0.y, 0.0, 0.0);  
+    gl_TexCoord[0].y =  gl_TexCoord[0].y + 0.5 * season;
     
     // Position and scaling
     vec3 position = gl_Vertex.xyz * gl_Normal.xxy;

Shaders/tree-haze.vert

@@ -37,6 +37,8 @@ uniform float visibility;
 uniform float overcast;
 //uniform float scattering;
 uniform float ground_scattering;
+uniform float snow_level;
+uniform int   season;
 
 float earthShade;
 float mie_angle;
@@ -82,6 +84,9 @@ void main()
   float sr = sin(gl_FogCoord + gl_Color.x);
   float cr = cos(gl_FogCoord + gl_Color.x);
   gl_TexCoord[0] = vec4(texFract, gl_MultiTexCoord0.y, 0.0, 0.0);
+  
+  // Determine the y texture coordinate based on whether it's summer, winter, snowy.
+  gl_TexCoord[0].y =  gl_TexCoord[0].y + 0.25 * int(gl_Color.z > snow_level) + 0.5 * season;
 
   // scaling
   vec3 position = gl_Vertex.xyz * gl_Normal.xxy;

Shaders/tree.vert

@@ -12,6 +12,7 @@
 //
 // void fog_Func(int type);
 // /////////////////////////
+uniform int season;
 
 void main(void)
 {
@@ -25,6 +26,7 @@ void main(void)
   float sr = sin(gl_FogCoord + gl_Color.x);
   float cr = cos(gl_FogCoord + gl_Color.x);
   gl_TexCoord[0] = vec4(texFract, gl_MultiTexCoord0.y, 0.0, 0.0);
+  gl_TexCoord[0].y =  gl_TexCoord[0].y + 0.5 * season;
 
   // scaling
   vec3 position = gl_Vertex.xyz * gl_Normal.xxy;