diff --git a/src/osgPlugins/ive/CMakeLists.txt b/src/osgPlugins/ive/CMakeLists.txt
index 02769b584..ee503238b 100644
--- a/src/osgPlugins/ive/CMakeLists.txt
+++ b/src/osgPlugins/ive/CMakeLists.txt
@@ -3,8 +3,8 @@
 
 SET(TARGET_SRC
     AlphaFunc.cpp
-    AnimationPath.cpp
     AnimationPathCallback.cpp
+    AnimationPath.cpp
     AutoTransform.cpp
     AzimElevationSector.cpp
     AzimSector.cpp
@@ -18,44 +18,50 @@ SET(TARGET_SRC
     ClipPlane.cpp
     ClusterCullingCallback.cpp
     ColorMask.cpp
+    CompositeLayer.cpp
     ConeSector.cpp
     ConvexPlanarOccluder.cpp
     ConvexPlanarPolygon.cpp
     CoordinateSystemNode.cpp
     CullFace.cpp
-    DOFTransform.cpp
     DataInputStream.cpp
     DataOutputStream.cpp
     Depth.cpp
     DirectionalSector.cpp
+    DOFTransform.cpp
+    Drawable.cpp
     DrawArrayLengths.cpp
     DrawArrays.cpp
     DrawElementsUByte.cpp
     DrawElementsUInt.cpp
     DrawElementsUShort.cpp
-    Drawable.cpp
     ElevationSector.cpp
     EllipsoidModel.cpp
     Exception.cpp
+    Fog.cpp
     FragmentProgram.cpp
     FrontFace.cpp
     Geode.cpp
     Geometry.cpp
     Group.cpp
+    HeightFieldLayer.cpp
     Image.cpp
+    ImageLayer.cpp
     Impostor.cpp
-    LOD.cpp
+    Layer.cpp
     Light.cpp
     LightModel.cpp
     LightPoint.cpp
     LightPointNode.cpp
     LightSource.cpp
     LineWidth.cpp
+    Locator.cpp
+    LOD.cpp
     Material.cpp
     MatrixTransform.cpp
+    Multisample.cpp
     MultiSwitch.cpp
     MultiTextureControl.cpp
-    Multisample.cpp
     Node.cpp
     Object.cpp
     OccluderNode.cpp
@@ -79,24 +85,19 @@ SET(TARGET_SRC
     StateSet.cpp
     Stencil.cpp
     Switch.cpp
-    TexEnv.cpp
+    TerrainTile.cpp
     TexEnvCombine.cpp
+    TexEnv.cpp
     TexGen.cpp
     TexGenNode.cpp
     TexMat.cpp
     Text.cpp
-    Texture.cpp
     Texture1D.cpp
     Texture2D.cpp
     Texture3D.cpp
+    Texture.cpp
     TextureCubeMap.cpp
     TextureRectangle.cpp
-    TerrainTile.cpp
-    Locator.cpp
-    Layer.cpp
-    HeightFieldLayer.cpp
-    ImageLayer.cpp
-    CompositeLayer.cpp
     Transform.cpp
     Uniform.cpp
     VertexProgram.cpp
@@ -105,8 +106,8 @@ SET(TARGET_SRC
 )
 SET(TARGET_H
     AlphaFunc.h
-    AnimationPath.h
     AnimationPathCallback.h
+    AnimationPath.h
     AutoTransform.h
     AzimElevationSector.h
     AzimSector.h
@@ -120,41 +121,47 @@ SET(TARGET_H
     ClipPlane.h
     ClusterCullingCallback.h
     ColorMask.h
+    CompositeLayer.h
     ConeSector.h
     ConvexPlanarOccluder.h
     ConvexPlanarPolygon.h
     CoordinateSystemNode.h
     CullFace.h
-    DOFTransform.h
     DataInputStream.h
     DataOutputStream.h
     DataTypeSize.h
     Depth.h
     DirectionalSector.h
+    DOFTransform.h
+    Drawable.h
     DrawArrayLengths.h
     DrawArrays.h
     DrawElementsUByte.h
     DrawElementsUInt.h
     DrawElementsUShort.h
-    Drawable.h
     ElevationSector.h
     EllipsoidModel.h
     Exception.h
+    Fog.h
     FragmentProgram.h
     FrontFace.h
     Geode.h
     Geometry.h
     Group.h
+    HeightFieldLayer.h
     Image.h
+    ImageLayer.h
     Impostor.h
     IveVersion.h
-    LOD.h
+    Layer.h
     Light.h
     LightModel.h
     LightPoint.h
     LightPointNode.h
     LightSource.h
     LineWidth.h
+    Locator.h
+    LOD.h
     Material.h
     MatrixTransform.h
     MultiSwitch.h
@@ -177,30 +184,25 @@ SET(TARGET_H
     Sequence.h
     ShadeModel.h
     Shader.h
-    Shape.h
     ShapeDrawable.h
+    Shape.h
     StateSet.h
     Stencil.h
     Switch.h
-    TexEnv.h
+    TerrainTile.h
     TexEnvCombine.h
+    TexEnv.h
     TexGen.h
     TexGenNode.h
     TexMat.h
     Text.h
-    Texture.h
     Texture1D.h
     Texture2D.h
     Texture3D.h
     TextureCubeMap.h
+    Texture.h
     TextureRectangle.h
-    TerrainTile.h
     Transform.h
-    Locator.h
-    Layer.h
-    HeightFieldLayer.h
-    ImageLayer.h
-    CompositeLayer.h
     Uniform.h
     VertexProgram.h
     Viewport.h
diff --git a/src/osgPlugins/ive/DataInputStream.cpp b/src/osgPlugins/ive/DataInputStream.cpp
index b9e4338cf..ab5fc4afe 100644
--- a/src/osgPlugins/ive/DataInputStream.cpp
+++ b/src/osgPlugins/ive/DataInputStream.cpp
@@ -51,6 +51,7 @@
 #include "Image.h"
 #include "PointSprite.h"
 #include "Multisample.h"
+#include "Fog.h"
 
 
 #include "Group.h"
@@ -1181,6 +1182,10 @@ osg::StateAttribute* DataInputStream::readStateAttribute()
         attribute = new osg::Stencil();
         ((ive::Stencil*)(attribute))->read(this);
     }
+    else if(attributeID == IVEFOG){
+        attribute = new osg::Fog();
+        ((ive::Fog*)(attribute))->read(this);
+    }    
     else{
         throw Exception("Unknown StateAttribute in StateSet::read()");
     }
diff --git a/src/osgPlugins/ive/DataOutputStream.cpp b/src/osgPlugins/ive/DataOutputStream.cpp
index 723eccab0..c9d71a1e6 100644
--- a/src/osgPlugins/ive/DataOutputStream.cpp
+++ b/src/osgPlugins/ive/DataOutputStream.cpp
@@ -54,6 +54,7 @@
 #include "Image.h"
 #include "PointSprite.h"
 #include "Multisample.h"
+#include "Fog.h"
 
 #include "Group.h"
 #include "MatrixTransform.h"
@@ -828,6 +829,10 @@ void DataOutputStream::writeStateAttribute(const osg::StateAttribute* attribute)
         else if(dynamic_cast<const osg::Multisample*>(attribute)){
             ((ive::Multisample*)(attribute))->write(this);
         }
+        // This is a Fog
+        else if(dynamic_cast<const osg::Fog*>(attribute)){
+            ((ive::Fog*)(attribute))->write(this);
+        }
 
         else{
             std::string className = attribute->className();
diff --git a/src/osgPlugins/ive/Fog.cpp b/src/osgPlugins/ive/Fog.cpp
new file mode 100644
index 000000000..e356376d9
--- /dev/null
+++ b/src/osgPlugins/ive/Fog.cpp
@@ -0,0 +1,67 @@
+/**********************************************************************
+ *
+ *    FILE:            Fog.cpp
+ *
+ *    DESCRIPTION:    Read/Write osg::Fog in binary format to disk.
+ *
+ *    CREATED BY:        Liang Aibin
+ *
+ *    HISTORY:        Created 17.06.2008
+ * 
+ **********************************************************************/
+
+#include "Exception.h"
+#include "Fog.h"
+#include "Object.h"
+
+using namespace ive;
+
+void Fog::write(DataOutputStream* out){
+
+  // write Fog's identification
+  out->writeInt(IVEFOG);
+
+  // if the osg class is inherited by any other class we should also write this to file
+  osg::Object*  obj = dynamic_cast<osg::Object*>(this);
+  if(obj)
+    ((ive::Object*)(obj))->write(out);
+  else
+    throw Exception("Fog::write(): Could not cast this osg::Fog to an osg::Object.");
+
+  // write Fog's properties
+  out->writeInt(getMode());
+  out->writeFloat(getDensity());
+  out->writeFloat(getStart());
+  out->writeFloat(getEnd());
+  out->writeVec4(getColor());
+  out->writeInt(getFogCoordinateSource());
+}
+
+void Fog::read(DataInputStream* in){
+
+  // peek on Fog's identification
+  int id = in->peekInt();
+  if(id == IVEFOG)
+    {
+      // read Fog's identification
+      id = in->readInt();
+
+      // if the osg class is inherited by any other class we should also read this from file
+      osg::Object*  obj = dynamic_cast<osg::Object*>(this);
+      if(obj)
+        ((ive::Object*)(obj))->read(in);
+      else
+        throw Exception("Fog::read(): Could not cast this osg::Fog to an osg::Object.");
+
+      // Read Fog's properties
+      setMode(osg::Fog::Mode(in->readInt()));
+      setDensity(in->readFloat());
+      setStart(in->readFloat());
+      setEnd(in->readFloat());
+      setColor(in->readVec4());
+      setFogCoordinateSource(in->readInt());
+    }
+  else{
+    throw Exception("Fog::read(): Expected Fog identification.");
+  }
+}
diff --git a/src/osgPlugins/ive/Fog.h b/src/osgPlugins/ive/Fog.h
new file mode 100644
index 000000000..431b28450
--- /dev/null
+++ b/src/osgPlugins/ive/Fog.h
@@ -0,0 +1,15 @@
+#ifndef IVE_FOG
+#define IVE_FOG 1
+
+#include <osg/Fog>
+#include "ReadWrite.h"
+
+namespace ive{
+  class Fog : public osg::Fog, public ReadWrite {
+  public:
+    void write(DataOutputStream* out);
+    void read(DataInputStream* in);
+  };
+}
+
+#endif
diff --git a/src/osgPlugins/ive/ReadWrite.h b/src/osgPlugins/ive/ReadWrite.h
index c15b5ac3e..86445eb52 100644
--- a/src/osgPlugins/ive/ReadWrite.h
+++ b/src/osgPlugins/ive/ReadWrite.h
@@ -83,6 +83,7 @@ namespace ive {
 #define IVETEXTURERECTANGLE             0x00001130
 #define IVEPOINTSPRITE                  0x00001131
 #define IVEMULTISAMPLE                  0x00001132
+#define IVEFOG                          0x00001133
 
 // Drawables
 #define IVEDRAWABLE                     0x00001000
diff --git a/src/osgPlugins/osg/Fog.cpp b/src/osgPlugins/osg/Fog.cpp
index 83faa89ee..e61769cf9 100644
--- a/src/osgPlugins/osg/Fog.cpp
+++ b/src/osgPlugins/osg/Fog.cpp
@@ -135,7 +135,7 @@ const char* Fog_getModeStr(Fog::Mode mode)
 {
     switch(mode)
     {
-        case(Fog::LINEAR): return "NEVER";
+        case(Fog::LINEAR): return "LINEAR";
         case(Fog::EXP): return "EXP";
         case(Fog::EXP2): return "EXP2";
     }