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diff --git a/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.h b/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.h
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+++ b/extern/bullet2/src/BulletCollision/BroadphaseCollision/btOverlappingPairCache.h
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+
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef OVERLAPPING_PAIR_CACHE_H
+#define OVERLAPPING_PAIR_CACHE_H
+
+
+#include "btBroadphaseInterface.h"
+#include "btBroadphaseProxy.h"
+#include "LinearMath/btPoint3.h"
+#include <set>
+
+
+struct	btOverlapCallback
+{
+virtual ~btOverlapCallback()
+{
+}
+	//return true for deletion of the pair
+	virtual bool	processOverlap(btBroadphasePair& pair) = 0;
+};
+
+///btOverlappingPairCache maintains the objects with overlapping AABB
+///Typically managed by the Broadphase, Axis3Sweep or btSimpleBroadphase
+class	btOverlappingPairCache : public btBroadphaseInterface
+{
+	//avoid brute-force finding all the time
+	std::set<btBroadphasePair>	m_overlappingPairSet;
+	
+	//during the dispatch, check that user doesn't destroy/create proxy
+	bool		m_blockedForChanges;
+	
+	public:
+		
+	btOverlappingPairCache();	
+	virtual ~btOverlappingPairCache();
+
+	void	processAllOverlappingPairs(btOverlapCallback*);
+
+	void	removeOverlappingPair(btBroadphasePair& pair);
+
+	void	cleanOverlappingPair(btBroadphasePair& pair);
+	
+	void	addOverlappingPair(btBroadphaseProxy* proxy0,btBroadphaseProxy* proxy1);
+
+	btBroadphasePair*	findPair(btBroadphaseProxy* proxy0,btBroadphaseProxy* proxy1);
+		
+	
+	void	cleanProxyFromPairs(btBroadphaseProxy* proxy);
+
+	void	removeOverlappingPairsContainingProxy(btBroadphaseProxy* proxy);
+
+
+	inline bool needsBroadphaseCollision(btBroadphaseProxy* proxy0,btBroadphaseProxy* proxy1) const
+	{
+		bool collides = proxy0->m_collisionFilterGroup & proxy1->m_collisionFilterMask;
+		collides = collides && (proxy1->m_collisionFilterGroup & proxy0->m_collisionFilterMask);
+		
+		return collides;
+	}
+		
+	
+
+	virtual void	refreshOverlappingPairs() =0;
+
+
+
+
+};
+#endif //OVERLAPPING_PAIR_CACHE_H
+