Added osgmultiplecameras example and support for pre/post multiplaction.

include/osg/CameraNode

@@ -64,6 +64,17 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
         }
 
 
+        enum TransformOrder
+        {
+            PRE_MULTIPLE,
+            POST_MULTIPLE  
+        };
+        
+        void setTransformOrder(TransformOrder order) { _transformOrder = order; }
+        TransformOrder getTransformOrder() const { return _transformOrder; }
+        
+        
+
         /** Set the projection matrix. Can be thought of as setting the lens of a camera. */
         inline void setProjectionMatrix(const osg::Matrixf& matrix) { _projectionMatrix.set(matrix); }
 
@@ -225,6 +236,8 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
         Vec4                        _clearColor;
         GLbitfield                  _clearMask;
         ref_ptr<Viewport>           _viewport;
+
+        TransformOrder              _transformOrder;
         Matrixd                     _projectionMatrix;
         Matrixd                     _viewMatrix;