diff --git a/materials.xml b/materials.xml
index f7297d948..fb84872cd 100644
--- a/materials.xml
+++ b/materials.xml
@@ -80,9 +80,17 @@ Properties currently used:
     sub-entries: name, left (default: 0.0), right (default: 1.0)
     (left and right describe the horizontal position in the texture.)
 
-  tree-coverage: The coverage of trees in m^2. A lower number means a
-    higher density of trees. A value of 0 indicates no trees.
+  wood-coverage: The coverage of woods in m^2. A lower number means a
+    higher density of woods. A value of 0 indicates no woods.
 
+  wood-size: The average size of each wood in m^2. A lower number
+    means smaller individual woods. If not set, each wood is considered
+    to contain a single tree, causing even distribution.
+
+  tree-density: The area covered by each tree in the wood in m^2. A
+    lower number means denser individual woods. Ignored if wood-size
+    is not set.
+    
   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.
@@ -682,7 +690,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -708,7 +716,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/deciduous-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -733,7 +741,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>5000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -757,7 +765,7 @@ Shared parameters for various materials.
  <xsize>1000</xsize>
  <ysize>1000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -780,7 +788,7 @@ Shared parameters for various materials.
  <xsize>1000</xsize>
  <ysize>1000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -840,7 +848,7 @@ Shared parameters for various materials.
  </specular>
  <shininess>1.2</shininess>
  <light-coverage>20000000.0</light-coverage>
- <tree-coverage>12000.0</tree-coverage>
+ <wood-coverage>12000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-shrub.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -923,7 +931,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>250000.0</tree-coverage>
+ <wood-coverage>250000.0</wood-coverage>
+ <wood-size>5000.0</wood-size>
+ <tree-density>2000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -987,7 +997,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>250000.0</wood-coverage>
+ <wood-size>5000.0</wood-size>
+ <tree-density>2000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1272,7 +1284,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>1000000.0</wood-coverage>
+ <wood-size>20000.0</wood-size>
+ <tree-density>4000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1331,7 +1345,7 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>500000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1391,7 +1405,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>500000.0</wood-coverage>
+ <wood-size>20000.0</wood-size>
+ <tree-density>5000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1432,7 +1448,7 @@ Shared parameters for various materials.
  <rolling-friction>0.1</rolling-friction>
  <bumpiness>0.3</bumpiness>
  <load-resistance>1e30</load-resistance>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>500000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1458,7 +1474,7 @@ Shared parameters for various materials.
  <rolling-friction>0.6</rolling-friction>
  <bumpiness>0.7</bumpiness>
  <load-resistance>10</load-resistance>
- <tree-coverage>200000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-summer.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1488,7 +1504,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1513,7 +1529,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/deciduous-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1537,7 +1553,7 @@ Shared parameters for various materials.
  <xsize>2000</xsize>
  <ysize>2000</ysize>
  <light-coverage>5000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1560,7 +1576,7 @@ Shared parameters for various materials.
  <xsize>1000</xsize>
  <ysize>1000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1582,7 +1598,7 @@ Shared parameters for various materials.
  <xsize>1000</xsize>
  <ysize>1000</ysize>
  <light-coverage>10000000.0</light-coverage>
- <tree-coverage>4000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/coniferous-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1641,7 +1657,7 @@ Shared parameters for various materials.
  </specular>
  <shininess>1.2</shininess>
  <light-coverage>20000000.0</light-coverage>
- <tree-coverage>8000.0</tree-coverage>
+ <wood-coverage>8000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-shrub-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1724,7 +1740,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>250000.0</tree-coverage>
+ <wood-coverage>250000.0</wood-coverage>
+ <wood-size>5000.0</wood-size>
+ <tree-density>5000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -1788,7 +1806,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>250000.0</wood-coverage>
+ <wood-size>5000.0</wood-size>
+ <tree-density>2000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -2070,7 +2090,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>1000000.0</wood-coverage>
+ <wood-size>20000.0</wood-size>
+ <tree-density>4000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -2128,7 +2150,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>150000.0</wood-coverage>
+ <wood-size>10000.0</wood-size>
+ <tree-density>5000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -2187,7 +2211,9 @@ Shared parameters for various materials.
    <heading-type>random</heading-type>
   </object>
  </object-group>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>150000.0</wood-coverage>
+ <wood-size>10000.0</wood-size>
+ <tree-density>5000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -2227,7 +2253,9 @@ Shared parameters for various materials.
  <rolling-friction>0.1</rolling-friction>
  <bumpiness>0.3</bumpiness>
  <load-resistance>1e30</load-resistance>
- <tree-coverage>500000.0</tree-coverage>
+ <wood-coverage>150000.0</wood-coverage>
+ <wood-size>10000.0</wood-size>
+ <tree-density>5000.0</tree-density>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>
@@ -2252,7 +2280,7 @@ Shared parameters for various materials.
  <rolling-friction>0.6</rolling-friction>
  <bumpiness>0.7</bumpiness>
  <load-resistance>10</load-resistance>
- <tree-coverage>200000.0</tree-coverage>
+ <wood-coverage>4000.0</wood-coverage>
  <tree-texture>Textures/Trees/mixed-winter.png</tree-texture>
  <tree-varieties>8</tree-varieties>
  <tree-range-m alias="/params/forest/tree-range-m"/>