Added osgFX::MultiTextureControl node for managing blending between

different texture layers.

src/osgPlugins/ive/DataOutputStream.cpp

@@ -63,6 +63,8 @@
 #include "MultiSwitch.h"
 #include "VisibilityGroup.h"
 
+#include "MultiTextureControl.h"
+
 #include "Geometry.h"
 #include "ShapeDrawable.h"
 
@@ -733,6 +735,9 @@ void DataOutputStream::writeNode(const osg::Node* node)
         else if(dynamic_cast<const osgSim::LightPointNode*>(node)){
             ((ive::LightPointNode*)(node))->write(this);
         }
+        else if(dynamic_cast<const osgFX::MultiTextureControl*>(node)){
+            ((ive::MultiTextureControl*)(node))->write(this);
+        }
         else
             throw Exception("Unknown node in Group::write()");