From Liang Aibin, " In lastest svn version of OSG, the .ive plugin missing osg::Light, it

does not process I/O for osg::Light. Now I have fixed it as follows:
 
2. In DataInputStream.cpp, I add support code in DataInputStream::readStateAttribute
    for osg::Light.
 
3. In DataOutputStream.cpp, I add support code in DataOutputStream::writeStateAttribute
    for osg::Light.
 "

src/osgPlugins/ive/DataOutputStream.cpp

@@ -56,6 +56,7 @@
 #include "PointSprite.h"
 #include "Multisample.h"
 #include "Fog.h"
+#include "Light.h"
 
 #include "Group.h"
 #include "MatrixTransform.h"
@@ -835,6 +836,10 @@ void DataOutputStream::writeStateAttribute(const osg::StateAttribute* attribute)
         else if(dynamic_cast<const osg::Fog*>(attribute)){
             ((ive::Fog*)(attribute))->write(this);
         }
+        // This is a Light
+        else if(dynamic_cast<const osg::Light*>(attribute)){
+            ((ive::Light*)(attribute))->write(this);
+        }
 
         else{
             std::string className = attribute->className();