From Martin Beckett, "In MatrixManipulator can we have computeHomePosition() use _homeUp rather than the hardcoded (0,0,1).

This makes it possible to redefine the viewing direction of 'home' in the other manipulator - so home in a GIS app could be a plan view.
Since _homeUp is set to (0,0,1) and no current code changes it there shouldn't be any difference for current users."

include/osgGA/MatrixManipulator

@@ -151,8 +151,9 @@ public:
                 const osg::BoundingSphere& boundingSphere=getNode()->getBound();
 
                 setHomePosition(boundingSphere._center+osg::Vec3( 0.0,-3.5f * boundingSphere._radius,0.0f),
-                                boundingSphere._center,
-                                osg::Vec3(0.0f,0.0f,1.0f),
+                                boundingSphere._center,                                
+                                //osg::Vec3(0.0f,0.0f,1.0f),                                
+                                _homeUp,
                                 _autoComputeHomePosition);
             }
         }