+#ifndef NO_OPENSCENEGRAPH_INTERFACE
+ // Create a local coordinate frame in the earth-centered frame of
+ // reference. X points north, Z points down.
+ // makeSimulationFrameRelative() only includes rotation.
+ osg::Matrix makeSimulationFrameRelative() const;
+ osg::Matrix makeSimulationFrame() const;
+
+ // Create a Z-up local coordinate frame in the earth-centered frame
+ // of reference. This is what scenery models, etc. expect.
+ // makeZUpFrameRelative() only includes rotation.
+ osg::Matrix makeZUpFrameRelative() const;
+ osg::Matrix makeZUpFrame() const;
+#endif