Seperated out the scene->requiresRedraw() method into a osgViewer::Viewer::requiresRedraw() method to make the functionality clearer and easier to override.

include/osgViewer/View

@@ -308,6 +308,9 @@ class OSGVIEWER_EXPORT View : public osg::View, public osgGA::GUIActionAdapter
         /** Return true if there are pending updates to the scene graph that require an update. */
         virtual bool requiresUpdateSceneGraph() const;
 
+        /** Return true if there are graphics operations that require a draw of the grpahics context. */
+        virtual bool requiresRedraw() const;
+
 public:
 
         osg::Texture* createDistortionTexture(int width, int height);

src/osgViewer/CompositeViewer.cpp

@@ -267,7 +267,7 @@ bool CompositeViewer::checkNeedToDoFrame()
         ++itr)
     {
         osgViewer::View* view = itr->get();
-        if (view && view->requiresUpdateSceneGraph()) return true;
+        if (view && (view->requiresUpdateSceneGraph() || view->requiresRedraw())) return true;
     }
 
     // check if events are available and need processing

src/osgViewer/View.cpp

@@ -1138,13 +1138,18 @@ bool View::requiresUpdateSceneGraph() const
     // check if the scene requires an update traversal
     if (_scene.valid() && _scene->requiresUpdateSceneGraph()) return true;
 
-    // check if the scene requires a redraw
-    // FIXME...
-    if (_scene.valid() && _scene->requiresRedraw()) return true;
 
     return false;
 }
 
+bool View::requiresRedraw() const
+{
+    // check if the scene requires a redraw
+    if (_scene.valid() && _scene->requiresRedraw()) return true;
+    return false;
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 //
 // Methods that support Stereo and Keystone correction.

src/osgViewer/Viewer.cpp

@@ -379,6 +379,9 @@ bool Viewer::checkNeedToDoFrame()
     // check if the view needs to update the scene graph
     if (requiresUpdateSceneGraph()) return true;
 
+    // check if the view needs to be redraw
+    if (requiresRedraw()) return true;
+
     // check if events are available and need processing
     if (checkEvents()) return true;