From 07550df2f2a2fd3922a08d01070067a827b87ec1 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 30 Jul 2013 06:39:36 +0000
Subject: [PATCH] From svn/trunk merged "Changed default cull mask to match the
 left cull mask so that mono rendering of presentations with left/right stereo
 images/movies works fine."

---
 applications/present3D/present3D.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/applications/present3D/present3D.cpp b/applications/present3D/present3D.cpp
index 78f281300..1fd34f1cd 100644
--- a/applications/present3D/present3D.cpp
+++ b/applications/present3D/present3D.cpp
@@ -491,10 +491,20 @@ int main( int argc, char **argv )
     }
 
     // set up stereo masks
-    viewer.getCamera()->setCullMask(0xffffffff);
+
     viewer.getCamera()->setCullMaskLeft(0x00000001);
     viewer.getCamera()->setCullMaskRight(0x00000002);
 
+    bool assignLeftCullMaskForMono = true;
+    if (assignLeftCullMaskForMono)
+    {
+        viewer.getCamera()->setCullMask(viewer.getCamera()->getCullMaskLeft());
+    }
+    else
+    {
+        viewer.getCamera()->setCullMask(0xffffffff);
+    }
+
     // set up the camera manipulators.
     {
         osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;