From 2d621cb58a96769d6f539058412b54764c9391aa Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 24 Apr 2009 18:37:36 +0000
Subject: [PATCH] Added checking of need to update.

---
 src/osgViewer/Viewer.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index de3068541..bdd14ac61 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -327,13 +327,19 @@ bool Viewer::checkNeedToDoFrame()
     if (_requestRedraw) return true;
     if (_requestContinousUpdate) return true;
 
+
     // If the database pager is going to update the scene the render flag is
     // set so that the updates show up
     if(getDatabasePager()->requiresUpdateSceneGraph() || getDatabasePager()->getRequestsInProgress()) return true;
 
+    // if there update callbacks then we need to do frame.
+    if (_camera->getUpdateCallback()) return true;
+    if (getSceneData()!=0 && getSceneData()->getNumChildrenRequiringUpdateTraversal()>0) return true;
+
     // now do a eventTraversal to see if any events might require a new frame.
     eventTraversal();
 
+    // now check if any of the event handles have prompted a redraw.
     if (_requestRedraw) return true;
     if (_requestContinousUpdate) return true;