diff --git a/include/osg/CullSettings b/include/osg/CullSettings
index 46d0f327b..8da99af6e 100644
--- a/include/osg/CullSettings
+++ b/include/osg/CullSettings
@@ -42,7 +42,7 @@ class SG_EXPORT CullSettings
 
         CullSettings(const CullSettings& cs);
 
-        ~CullSettings() {}
+        virtual ~CullSettings() {}
         
         CullSettings& operator = (const CullSettings& settings)
         {
@@ -117,12 +117,15 @@ class SG_EXPORT CullSettings
                                           FAR_PLANE_CULLING,
             SMALL_FEATURE_CULLING       = 0x8,
             SHADOW_OCCLUSION_CULLING    = 0x10,
+            CLUSTER_CULLING             = 0x20,
             DEFAULT_CULLING             = VIEW_FRUSTUM_SIDES_CULLING|
                                           SMALL_FEATURE_CULLING|
-                                          SHADOW_OCCLUSION_CULLING,
+                                          SHADOW_OCCLUSION_CULLING|
+                                          CLUSTER_CULLING,
             ENABLE_ALL_CULLING          = VIEW_FRUSTUM_CULLING|
                                           SMALL_FEATURE_CULLING|
-                                          SHADOW_OCCLUSION_CULLING
+                                          SHADOW_OCCLUSION_CULLING|
+                                          CLUSTER_CULLING
         };
         
         typedef unsigned int CullingMode;
diff --git a/src/osg/ClusterCullingCallback.cpp b/src/osg/ClusterCullingCallback.cpp
index c719d0aef..a0519b0cd 100644
--- a/src/osg/ClusterCullingCallback.cpp
+++ b/src/osg/ClusterCullingCallback.cpp
@@ -12,6 +12,7 @@
 */
 #include <osg/ClusterCullingCallback>
 #include <osg/TriangleFunctor>
+#include <osg/CullSettings>
 
 using namespace osg;
 
@@ -145,11 +146,16 @@ void ClusterCullingCallback::set(const osg::Vec3& controlPoint, const osg::Vec3&
 
 bool ClusterCullingCallback::cull(osg::NodeVisitor* nv, osg::Drawable* , osg::State*) const
 {
-//    return false;
+    CullSettings* cs = dynamic_cast<CullSettings*>(nv);
+    if (cs && !(cs->getCullingMode() & CullSettings::CLUSTER_CULLING))
+    {
+        // cluster culling switched off cull settings.
+        return false;
+    }
 
     if (_deviation<=-1.0f)
     {
-//        osg::notify(osg::NOTICE)<<"ClusterCullingCallback::cull()  _deviation="<<_deviation<<std::endl;
+        // cluster culling switch off by deviation.
         return false;
     }