diff --git a/src/osgPlugins/ive/CMakeLists.txt b/src/osgPlugins/ive/CMakeLists.txt
index 2d678e459..d49320c19 100644
--- a/src/osgPlugins/ive/CMakeLists.txt
+++ b/src/osgPlugins/ive/CMakeLists.txt
@@ -59,6 +59,7 @@ Multisample.cpp
 Node.cpp
 Object.cpp
 OccluderNode.cpp
+OcclusionQueryNode.cpp
 PagedLOD.cpp
 Point.cpp
 PointSprite.cpp
@@ -155,6 +156,7 @@ MultiTextureControl.h
 Node.h
 Object.h
 OccluderNode.h
+OcclusionQueryNode.h
 PagedLOD.h
 Point.h
 PointSprite.h
diff --git a/src/osgPlugins/ive/DataInputStream.cpp b/src/osgPlugins/ive/DataInputStream.cpp
index f6154a9f5..e9d4f64d1 100644
--- a/src/osgPlugins/ive/DataInputStream.cpp
+++ b/src/osgPlugins/ive/DataInputStream.cpp
@@ -71,6 +71,7 @@
 #include "Transform.h"
 #include "Switch.h"
 #include "OccluderNode.h"
+#include "OcclusionQueryNode.h"
 #include "Impostor.h"
 #include "CoordinateSystemNode.h"
 #include "Uniform.h"
@@ -1418,6 +1419,10 @@ osg::Node* DataInputStream::readNode()
         node = new osg::OccluderNode();
         ((ive::OccluderNode*)(node))->read(this);
     }
+    else if(nodeTypeID== IVEOCCLUSIONQUERYNODE){
+        node = new osg::OcclusionQueryNode();
+        ((ive::OcclusionQueryNode*)(node))->read(this);
+    }
     else if(nodeTypeID== IVEVISIBILITYGROUP){
         node = new osgSim::VisibilityGroup();
         ((ive::VisibilityGroup*)(node))->read(this);
diff --git a/src/osgPlugins/ive/DataOutputStream.cpp b/src/osgPlugins/ive/DataOutputStream.cpp
index 325720675..95c1a6000 100644
--- a/src/osgPlugins/ive/DataOutputStream.cpp
+++ b/src/osgPlugins/ive/DataOutputStream.cpp
@@ -73,6 +73,7 @@
 #include "Transform.h"
 #include "Switch.h"
 #include "OccluderNode.h"
+#include "OcclusionQueryNode.h"
 #include "Impostor.h"
 #include "CoordinateSystemNode.h"
 
@@ -1038,6 +1039,9 @@ void DataOutputStream::writeNode(const osg::Node* node)
         else if(dynamic_cast<const osg::OccluderNode*>(node)){
             ((ive::OccluderNode*)(node))->write(this);
         }
+        else if(dynamic_cast<const osg::OcclusionQueryNode*>(node)){
+            ((ive::OcclusionQueryNode*)(node))->write(this);
+        }
         else if(dynamic_cast<const osg::Transform*>(node)){
             ((ive::Transform*)(node))->write(this);
         }
diff --git a/src/osgPlugins/ive/OcclusionQueryNode.cpp b/src/osgPlugins/ive/OcclusionQueryNode.cpp
new file mode 100644
index 000000000..c1910c705
--- /dev/null
+++ b/src/osgPlugins/ive/OcclusionQueryNode.cpp
@@ -0,0 +1,66 @@
+/**********************************************************************
+ *
+ *    FILE:            OcclusionQueryNode.cpp
+ *
+ *    DESCRIPTION:    Read/Write osg::OcclusionQueryNode in binary format to disk.
+ *
+ *    CREATED BY:     Copied and hacked OccluderNode.cpp by Paul Martz
+ *
+ *    HISTORY:        Created 2007.12.26
+ *
+ *    Copyright 2003 VR-C
+ **********************************************************************/
+
+#include "Exception.h"
+#include "OcclusionQueryNode.h"
+#include "Group.h"
+
+using namespace ive;
+
+void OcclusionQueryNode::write( DataOutputStream* out )
+{
+    // Write OcclusionQueryNode's identification.
+    out->writeInt(IVEOCCLUSIONQUERYNODE);
+
+    // If the osg class is inherited by any other class we should also write this to file.
+    osg::Group*  group = dynamic_cast<osg::Group*>(this);
+    if(group){
+        ((ive::Group*)(group))->write(out);
+    }
+    else
+        throw Exception("OcclusionQueryNode::write(): Could not cast this osg::OcclusionQueryNode to an osg::Group.");
+
+    // Write OcclusionQueryNode's properties.
+    out->writeBool( getQueriesEnabled() );
+    out->writeUInt( getVisibilityThreshold() );
+    out->writeInt( getQueryFrameCount() );
+    out->writeBool( getDebugDisplay() );
+}
+
+void OcclusionQueryNode::read( DataInputStream* in )
+{
+    // Peek on OcclusionQueryNode's identification.
+    int id = in->peekInt();
+    if(id == IVEOCCLUSIONQUERYNODE)
+    {
+        // Read OcclusionQueryNode's identification.
+        id = in->readInt();
+
+        // If the osg class is inherited by any other class we should also read this from file.
+        osg::Group*  group = dynamic_cast<osg::Group*>(this);
+        if(group){
+            ((ive::Group*)(group))->read(in);
+        }
+        else
+            throw Exception("OcclusionQueryNode::read(): Could not cast this osg::OcclusionQueryNode to an osg::Group.");
+
+        // Read OcclusionQueryNode's properties
+        setQueriesEnabled( in->readBool() );
+        setVisibilityThreshold( in->readUInt() );
+        setQueryFrameCount( in->readInt() );
+        setDebugDisplay( in->readBool() );
+    }
+    else{
+        throw Exception("OcclusionQueryNode::read(): Expected OcclusionQueryNode identification.");
+    }
+}
diff --git a/src/osgPlugins/ive/OcclusionQueryNode.h b/src/osgPlugins/ive/OcclusionQueryNode.h
new file mode 100644
index 000000000..6ad0c9348
--- /dev/null
+++ b/src/osgPlugins/ive/OcclusionQueryNode.h
@@ -0,0 +1,16 @@
+#ifndef IVE_OCCLUSIONQUERYNODE
+#define IVE_OCCLUSIONQUERYNODE 1
+
+#include <osg/OcclusionQueryNode>
+
+#include "ReadWrite.h"
+
+namespace ive{
+class OcclusionQueryNode : public osg::OcclusionQueryNode, 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 073868b21..bab338b66 100644
--- a/src/osgPlugins/ive/ReadWrite.h
+++ b/src/osgPlugins/ive/ReadWrite.h
@@ -37,6 +37,7 @@ namespace ive {
 #define IVECAMERA                       0x00000028
 #define IVECAMERAVIEW                   0x00000029
 #define IVEAUTOTRANSFORM                0x00000030
+#define IVEOCCLUSIONQUERYNODE           0x00000031
 
 // Node callbacks
 #define IVENODECALLBACK                 0x00000050
diff --git a/src/osgPlugins/osg/OcclusionQueryNode.cpp b/src/osgPlugins/osg/OcclusionQueryNode.cpp
index 0d78b3903..7b814eb1a 100644
--- a/src/osgPlugins/osg/OcclusionQueryNode.cpp
+++ b/src/osgPlugins/osg/OcclusionQueryNode.cpp
@@ -15,6 +15,7 @@
 #include <osg/OcclusionQueryNode>
 
 #include <iostream>
+#include <sstream>
 #include <string>
 
 #include <osg/io_utils>
@@ -40,7 +41,7 @@ bool OQN_readLocalData( osg::Object &obj, osgDB::Input &fr )
 {
     osg::OcclusionQueryNode& oqn = static_cast<osg::OcclusionQueryNode&>( obj );
     bool advanced( false );
-
+    int param;
     if (fr[0].matchWord( "QueriesEnabled" ))
     {
         bool enable( fr[1].getStr() == std::string("TRUE") );
@@ -48,6 +49,27 @@ bool OQN_readLocalData( osg::Object &obj, osgDB::Input &fr )
         fr+=2;
         advanced = true;
     }
+    if (fr.matchSequence( "VisibilityThreshold %i" ))
+    {
+        fr[1].getInt( param );
+        oqn.setVisibilityThreshold( param );
+        fr+=2;
+        advanced = true;
+    }
+    if (fr.matchSequence( "QueryFrameCount %i" ))
+    {
+        fr[1].getInt( param );
+        oqn.setQueryFrameCount( param );
+        fr+=2;
+        advanced = true;
+    }
+    if (fr[0].matchWord( "DebugDisplay" ))
+    {
+        bool enable( fr[1].getStr() == std::string("TRUE") );
+        oqn.setDebugDisplay( enable );
+        fr+=2;
+        advanced = true;
+    }
 
     return advanced;
 }
@@ -61,6 +83,13 @@ bool OQN_writeLocalData( const osg::Object &obj, osgDB::Output &fw )
     fw.indent() << "QueriesEnabled " <<
         (oqn.getQueriesEnabled() ? "TRUE" : "FALSE")
         << std::endl;
+    fw.indent() << "VisibilityThreshold " <<
+        oqn.getVisibilityThreshold() << std::endl;
+    fw.indent() << "QueryFrameCount " <<
+        oqn.getQueryFrameCount() << std::endl;
+    fw.indent() << "DebugDisplay " <<
+        (oqn.getDebugDisplay() ? "TRUE" : "FALSE")
+        << std::endl;
 
     return true;
 }