From Roland Smeenk, "Attached you will find an improved Collada plugin to properly support camera's.

A Collada camera will be added to the scenegraph as osg::CameraView. This allows the user to create a set of predefined camera viewpoints. I also added a new MatrixManipulator to osgGA called CameraViewSwitchManipulator and added usage of this to the osgviewer example. This manipulator allows switching between the predefined camera viewpoints. The current design limition I ran into is that a MatrixManipulator only manipulates the ViewMatrix, but for this particular  manipulator I also want to update the projectionMatrix of the camera when switching to a new viewpoint. This is not implemented because I don't know what would be the best way to design it. Any ideas?
 
Furthermore Collada also supports orthographic camera's, where an osg::CameraView only supports a perspective camera. Would it be useful to create a CameraView with customizable optics for this?"

src/osgGA/CameraViewSwitchManipulator.cpp

@@ -0,0 +1,111 @@
+#include <osgGA/CameraViewSwitchManipulator>
+#include <osg/Quat>
+#include <osg/Notify>
+#include <osg/BoundsChecking>
+
+
+using namespace osg;
+using namespace osgGA;
+
+class CollectCameraViewsNodeVisitor : public osg::NodeVisitor
+{
+public:
+    CollectCameraViewsNodeVisitor(CameraViewSwitchManipulator::CameraViewList* cameraViews):
+        osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
+        _cameraViews(cameraViews)
+    {}
+    
+    virtual void apply(CameraView& node)
+    {
+        _cameraViews->push_back(&node);
+    }
+    
+    CameraViewSwitchManipulator::CameraViewList* _cameraViews;
+};
+
+void CameraViewSwitchManipulator::setNode(osg::Node* node)
+{
+    _node = node;
+
+    _cameraViews.clear();
+    CollectCameraViewsNodeVisitor visitor(&_cameraViews);
+
+    _node->accept(visitor);
+}
+
+void CameraViewSwitchManipulator::getUsage(osg::ApplicationUsage& usage) const
+{
+    usage.addKeyboardMouseBinding("CameraViewSwitcher: [","Decrease current camera number");
+    usage.addKeyboardMouseBinding("CameraViewSwitcher: ]","Increase current camera number");
+}
+
+bool CameraViewSwitchManipulator::handle(const GUIEventAdapter& ea,GUIActionAdapter& us)
+{
+    if (ea.getHandled()) return false;
+
+    switch(ea.getEventType())
+    {
+ 
+        case(GUIEventAdapter::KEYDOWN):
+            if (ea.getKey()=='[')
+            {
+                if (_currentView == 0)
+                    _currentView = _cameraViews.size()-1;
+                else
+                    _currentView--;
+                return true;
+            }
+            else if (ea.getKey()==']')
+            {
+                _currentView++;
+                if (_currentView >= _cameraViews.size())
+                    _currentView = 0;
+                return true;
+            }
+            return false;
+
+        default:
+            return false;
+    }
+    return false;
+}
+
+osg::Matrixd CameraViewSwitchManipulator::getMatrix() const
+{
+    osg::Matrix mat;
+    if (_currentView < _cameraViews.size())
+    {
+        NodePathList parentNodePaths = _cameraViews[_currentView]->getParentalNodePaths();
+
+        if (!parentNodePaths.empty())
+        {
+            mat = osg::computeLocalToWorld(parentNodePaths[0]);
+            // TODO take into account the position and attitude of the CameraView
+        }
+        else
+        {
+            osg::notify(osg::NOTICE)<<"CameraViewSwitchManipulator::getMatrix(): Unable to calculate matrix due to empty parental path."<<std::endl;
+        }
+    }
+    return mat;    
+}
+
+osg::Matrixd CameraViewSwitchManipulator::getInverseMatrix() const
+{
+    osg::Matrix mat;
+    if (_currentView < _cameraViews.size())
+    {
+        NodePathList parentNodePaths = _cameraViews[_currentView]->getParentalNodePaths();
+
+        if (!parentNodePaths.empty())
+        {
+            mat = osg::computeWorldToLocal(parentNodePaths[0]);
+            // TODO take into account the position and attitude of the CameraView
+        }
+        else
+        {
+            osg::notify(osg::NOTICE)<<"CameraViewSwitchManipulator::getInverseMatrix(): Unable to calculate matrix due to empty parental path."<<std::endl;
+        }
+    }
+    return mat;
+}