diff --git a/Materials/regions/africa_rainforest.xml b/Materials/regions/africa_rainforest.xml
index 4296c0f42..521ac2e40 100644
--- a/Materials/regions/africa_rainforest.xml
+++ b/Materials/regions/africa_rainforest.xml
@@ -47,19 +47,23 @@
     <name>Airport</name>
     <name>AirportKeep</name>
     <name>Greenspace</name>
-    <effect>Effects/airfield</effect>
+    <effect>Effects/grass</effect>
     <texture-set>
       <texture>Terrain/grass_dry2.png</texture>
       <texture n="13">Terrain/grass_dry2.png</texture>
       <texture n="14">Terrain/airport_grass_overlay.png</texture>
+	  <texture n="20">Terrain/grass_dry2a.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
       <use_overlay>1</use_overlay>
-			<overlay_bias>0.5</overlay_bias>
+	  <overlay_bias>0.5</overlay_bias>
       <use_color_overlay>0</use_color_overlay>
       <base_layer_magnification>1.0</base_layer_magnification>
       <overlay_layer_magnification>8.0</overlay_layer_magnification>
+	  <max_grass_height>0.3</max_grass_height>
+	  <grass_density>0.7</grass_density>
+	  <grass_groups>3</grass_groups>
     </parameters>
     <xsize>256</xsize>
     <ysize>256</ysize>
@@ -83,6 +87,7 @@
     <bumpiness>0.1</bumpiness>
     <load-resistance>1e30</load-resistance>
   </material>
+
   
   <material>
     <name>dirt_rwy</name>
diff --git a/Materials/regions/corse.xml b/Materials/regions/corse.xml
index 1e7ce5947..4fe0d1458 100644
--- a/Materials/regions/corse.xml
+++ b/Materials/regions/corse.xml
@@ -17,27 +17,32 @@
 
   <!-- REGIONAL DEFINITIONS - CORSE							-->
 
-    <material>
+   <material>
     <name>Grass</name>
     <name>Airport</name>
     <name>AirportKeep</name>
     <name>Greenspace</name>
-    <effect>Effects/airfield</effect>
+    <effect>Effects/grass</effect>
     <texture-set>
       <texture>Terrain/grass_dry2.png</texture>
       <texture n="13">Terrain/grass_dry2a.png</texture>
       <texture n="14">Terrain/grass_dry2.png</texture>
       <texture n="15">Terrain/airport_grass_overlay.png</texture>
+	  <texture n="20">Terrain/grass_dry2a.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
       <use_overlay>1</use_overlay>
       <use_grain>1</use_grain>
-	<overlay_bias>0.0</overlay_bias>
+      <overlay_bias>0.0</overlay_bias>
       <use_color_overlay>0</use_color_overlay>
       <base_layer_magnification>1.0</base_layer_magnification>
       <overlay_layer_magnification>1.3</overlay_layer_magnification>
       <grain_layer_magnification>4.0</grain_layer_magnification>
+      <grass_modulate_by_overlay>1</grass_modulate_by_overlay>
+      <grass_modulate_height_min>0.25</grass_modulate_height_min>
+      <max_grass_height>0.22</max_grass_height>
+      <grass_groups>2</grass_groups>
     </parameters>
     <xsize>256</xsize>
     <ysize>256</ysize>
diff --git a/Materials/regions/mexico.xml b/Materials/regions/mexico.xml
index 742bfdcfe..de064a542 100644
--- a/Materials/regions/mexico.xml
+++ b/Materials/regions/mexico.xml
@@ -98,19 +98,31 @@
     <name>Grass</name>
     <name>Airport</name>
     <name>AirportKeep</name>
-    <effect>Effects/airfield</effect>
+    <name>Greenspace</name>
+    <effect>Effects/grass</effect>
     <texture-set>
-      <texture>Terrain/california-airport.png</texture>
-      <texture n="13">Terrain/gravel_red.png</texture>
-      <texture n="14">Terrain/grass_dry2.png</texture>
+      <texture>Terrain/grass_dry3.png</texture>
+      <texture n="13">Terrain/grass_dry3a.png</texture>
+      <texture n="14">Terrain/grass_dry3a.png</texture>
+      <texture n="15">Terrain/airport_grass_overlay.png</texture>
+     <texture n="20">Terrain/grass_dry3a.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
       <use_overlay>1</use_overlay>
-      <overlay_bias>-0.1</overlay_bias>
+      <use_grain>1</use_grain>
+      <overlay_bias>0.0</overlay_bias>
+      <use_color_overlay>0</use_color_overlay>
+      <base_layer_magnification>1.0</base_layer_magnification>
+      <overlay_layer_magnification>1.3</overlay_layer_magnification>
+      <grain_layer_magnification>4.0</grain_layer_magnification>
+      <max_grass_height>0.25</max_grass_height>
+      <grass_density>1.0</grass_density>
+      <grass_groups>2</grass_groups>
+      <grass_modulate_by_overlay>1</grass_modulate_by_overlay>
     </parameters>
-    <xsize>250</xsize>
-    <ysize>250</ysize>
+    <xsize>256</xsize>
+    <ysize>256</ysize>
     <light-coverage>4000000.0</light-coverage>
     <diffuse>
       <r>0.93</r>
diff --git a/Materials/regions/southern_europe.xml b/Materials/regions/southern_europe.xml
index fe3c024b0..fe42d9383 100644
--- a/Materials/regions/southern_europe.xml
+++ b/Materials/regions/southern_europe.xml
@@ -118,22 +118,27 @@
     <name>Airport</name>
     <name>AirportKeep</name>
     <name>Greenspace</name>
-    <effect>Effects/airfield</effect>
+    <effect>Effects/grass</effect>
     <texture-set>
       <texture>Terrain/grass_dry3.png</texture>
       <texture n="13">Terrain/grass_dry3a.png</texture>
       <texture n="14">Terrain/grass_dry3a.png</texture>
       <texture n="15">Terrain/airport_grass_overlay.png</texture>
+      <texture n="20">Terrain/grass_dry3a.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
       <use_overlay>1</use_overlay>
       <use_grain>1</use_grain>
-	<overlay_bias>0.0</overlay_bias>
+      <overlay_bias>0.0</overlay_bias>
       <use_color_overlay>0</use_color_overlay>
       <base_layer_magnification>1.0</base_layer_magnification>
       <overlay_layer_magnification>1.3</overlay_layer_magnification>
       <grain_layer_magnification>4.0</grain_layer_magnification>
+      <max_grass_height>0.25</max_grass_height>
+      <grass_density>1.0</grass_density>
+      <grass_groups>2</grass_groups>
+      <grass_modulate_by_overlay>1</grass_modulate_by_overlay>
     </parameters>
     <xsize>256</xsize>
     <ysize>256</ysize>
diff --git a/Materials/regions/us_southwest.xml b/Materials/regions/us_southwest.xml
index 9e9be27f3..f64da41c7 100644
--- a/Materials/regions/us_southwest.xml
+++ b/Materials/regions/us_southwest.xml
@@ -36,12 +36,13 @@
     <name>Grass</name>
     <name>Airport</name>
     <name>AirportKeep</name>
-    <effect>Effects/airfield</effect>
+    <effect>Effects/grass</effect>
     <texture-set>
       <texture>Terrain/california-airport.png</texture>
       <texture n="13">Terrain/gravel_red.png</texture>
       <texture n="14">Terrain/grass_dry2.png</texture>
       <texture n="15">Terrain/airport_grass_overlay.png</texture>
+     <texture n="20">Terrain/grass_dry2.png</texture>
     </texture-set>
     <parameters>
       <grit_alpha>0.4</grit_alpha>
@@ -50,6 +51,11 @@
       <use_grain>1</use_grain>
       <use_color_overlay>0</use_color_overlay>
       <base_layer_magnification>0.6</base_layer_magnification>
+      <max_grass_height>0.35</max_grass_height>
+      <grass_density>0.5</grass_density>
+      <grass_groups>2</grass_groups>
+      <grass_modulate_by_overlay>1</grass_modulate_by_overlay>
+      <grass_modulate_height_min>0.0</grass_modulate_height_min>
     </parameters>
     <xsize>250</xsize>
     <ysize>250</ysize>