#include <simgear/compiler.h>
-#include <string>
+#include <osg/Node>
-#include <plib/sg.h>
-
-#include <osg/Referenced>
-#include <osg/Geometry>
-#include <osg/Group>
-
-using std::string;
-
-class SGMaterial;
class SGMatModel;
-class SGMatModelGroup;
-class SGModelLib;
class SGPropertyNode;
-
/**
* the application must call sgUserDataInit() and specify the
* following values (needed by the model loader callback at draw time)