Added Inventor plugin, submitted by Sean Spicer, Written by Vivek (c) Magic-Earth.

To compile in do a setenv/export USE_COIN or USE_INVENTOR.

src/osgPlugins/Inventor/ReaderWriterIV.cpp

@@ -0,0 +1,63 @@
+#include "ReaderWriterIV.h"
+
+// OSG headers
+#include <osg/Notify>
+#include <osgDB/FileNameUtils>
+
+// Inventor headers
+#include <Inventor/SoInteraction.h>
+#include <Inventor/nodes/SoSeparator.h>
+
+#include "ConvertFromInventor.h"
+#include "GroupSoLOD.h"
+
+// Register with Registry to instantiate the inventor reader.
+osgDB::RegisterReaderWriterProxy<ReaderWriterIV> g_ivReaderWriterProxy;
+
+ReaderWriterIV::ReaderWriterIV()
+{
+}
+
+// Read file and convert to OSG
+osgDB::ReaderWriter::ReadResult 
+ReaderWriterIV::readNode(const std::string& fileName,
+                         const osgDB::ReaderWriter::Options*)
+{
+    std::string ext = osgDB::getLowerCaseFileExtension(fileName);
+    if (!acceptsExtension(ext)) 
+        return ReadResult::FILE_NOT_HANDLED;
+
+    osg::notify(osg::INFO) << "osgDB::ReaderWriterIV::readNode() Reading file " 
+                           << fileName.data() << std::endl;
+    
+    // Initialize Inventor
+    SoInteraction::init();
+
+    // Initial GroupSoLOD node
+    GroupSoLOD::initClass();
+
+    // Open the file
+    SoInput input;
+    if (!input.openFile(fileName.data()))
+    {
+        osg::notify(osg::WARN) << "osgDB::ReaderWriterIV::readIVFile() "
+                               << "Cannot open file " << fileName << std::endl;
+        return ReadResult::ERROR_IN_READING_FILE;
+    }
+
+    // Create the inventor scenegraph from the file
+    SoSeparator* rootIVNode = SoDB::readAll(&input);
+
+    // Close the file
+    input.closeFile();
+
+    if (rootIVNode)
+    {
+        // Convert the inventor scenegraph to an osg scenegraph and return it
+        ConvertFromInventor convertIV;
+        return convertIV.convert(rootIVNode);
+    }
+
+    return ReadResult::FILE_NOT_HANDLED;
+}
+