From Paul Martz, "Here's the mods to the OpenFlight plugin to support FLT export. The ZIP file contains the new .cpp/h files as well as existing files that I modified.

Changes to existing files:
  ReaderWriter.cpp -- to support writeNode() of course.
  ReaderWriterATTR.cpp -- to support writeObject -- we write .attr files for textures, if they don't already exist.
  AttrData.cpp/.h -- Minor fixes.
  CMakeLists.txt -- to include the new files in the build."
  
From Robert Osfield, port to non Windows platforms just required fixing of header capitilization errors
that windows lets through the net due to having a case insensitive file system.

src/osgPlugins/OpenFlight/expAncillaryRecords.cpp

@@ -0,0 +1,109 @@
+/* 
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or (at
+ * your option) any later version. The full license is in the LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+//
+// Copyright(c) 2008 Skew Matrix Software LLC.
+//
+
+#include "FltExportVisitor.h"
+#include "DataOutputStream.h"
+#include "Opcodes.h"
+#include <osg/MatrixTransform>
+#include <osg/Notify>
+
+
+namespace flt
+{
+
+
+/** If the DataOutputStream paraqmeter is NULL, write to the _records
+    member variable. Otherwise, write to the specified DataOutputStream.
+    */
+void
+FltExportVisitor::writeComment( const osg::Node& node, DataOutputStream* dos )
+{
+    if (dos==NULL)
+        dos = _records;
+
+    // Write all descriptions as Comment records.
+    unsigned int nd = node.getNumDescriptions();
+    unsigned int idx=0;
+    while( idx < nd )
+    {
+        const std::string& com = node.getDescription( idx );
+        unsigned int iLen = com.length() + 5;
+        if (iLen > 0xffff)
+        {
+            // short overrun
+            std::string warning( "fltexp: writeComment: Descriptions too long, resorts in short overrun. Skipping." );
+            _fltOpt->getWriteResult().warn( warning );
+            osg::notify( osg::WARN ) << warning << std::endl;
+            continue;
+        }
+        uint16 length( (uint16)iLen );
+
+        dos->writeInt16( (int16) COMMENT_OP );
+        dos->writeInt16( length );
+        dos->writeString( com );
+
+        idx++;
+    }
+}
+
+/** If the DataOutputStream paraqmeter is NULL, write to the _records
+    member variable. Otherwise, write to the specified DataOutputStream.
+    */
+void
+FltExportVisitor::writeLongID( const std::string& id, DataOutputStream* dos )
+{
+    if (dos==NULL)
+        dos = _records;
+
+    uint16 length( 2 + 2 + id.length() + 1 );  // +1 for terminating '\0'
+
+    dos->writeInt16( (int16) LONG_ID_OP );
+    dos->writeUInt16( length );
+    dos->writeString( id );
+}
+
+void
+FltExportVisitor::writeMatrix( const osg::Referenced* ref )
+{
+    const osg::RefMatrix* rm = dynamic_cast<const osg::RefMatrix*>( ref );
+    if (!rm)
+        return;
+
+    uint16 length( 4 + (16 * sizeof(float32)) );
+
+    _records->writeInt16( (int16) MATRIX_OP );
+    _records->writeUInt16( length );
+
+    int idx, jdx;
+    for (idx=0; idx<4; idx++)
+    {
+        for (jdx=0; jdx<4; jdx++)
+        {
+            _records->writeFloat32( (*rm)( idx, jdx ) );
+        }
+    }
+}
+
+void
+FltExportVisitor::writeContinuationRecord( const unsigned short length )
+{
+    osg::notify( osg::DEBUG_INFO ) << "fltexp: Continuation record length: " << length+4 << std::endl;
+    _records->writeInt16( (int16) CONTINUATION_OP );
+    _records->writeUInt16( length+4 );
+}
+
+
+}