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diff --git a/extern/bullet2/src/BulletDynamics/Featherstone/btMultiBodyDynamicsWorld.h b/extern/bullet2/src/BulletDynamics/Featherstone/btMultiBodyDynamicsWorld.h
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+++ b/extern/bullet2/src/BulletDynamics/Featherstone/btMultiBodyDynamicsWorld.h
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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2013 Erwin Coumans  http://bulletphysics.org
+
+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 BT_MULTIBODY_DYNAMICS_WORLD_H
+#define BT_MULTIBODY_DYNAMICS_WORLD_H
+
+#include "BulletDynamics/Dynamics/btDiscreteDynamicsWorld.h"
+
+
+class btMultiBody;
+class btMultiBodyConstraint;
+class btMultiBodyConstraintSolver;
+struct MultiBodyInplaceSolverIslandCallback;
+
+///The btMultiBodyDynamicsWorld adds Featherstone multi body dynamics to Bullet
+///This implementation is still preliminary/experimental.
+class btMultiBodyDynamicsWorld : public btDiscreteDynamicsWorld
+{
+protected:
+	btAlignedObjectArray<btMultiBody*> m_multiBodies;
+	btAlignedObjectArray<btMultiBodyConstraint*> m_multiBodyConstraints;
+	btAlignedObjectArray<btMultiBodyConstraint*> m_sortedMultiBodyConstraints;
+	btMultiBodyConstraintSolver*	m_multiBodyConstraintSolver;
+	MultiBodyInplaceSolverIslandCallback*	m_solverMultiBodyIslandCallback;
+
+	virtual void	calculateSimulationIslands();
+	virtual void	updateActivationState(btScalar timeStep);
+	virtual void	solveConstraints(btContactSolverInfo& solverInfo);
+	virtual void	integrateTransforms(btScalar timeStep);
+public:
+
+	btMultiBodyDynamicsWorld(btDispatcher* dispatcher,btBroadphaseInterface* pairCache,btMultiBodyConstraintSolver* constraintSolver,btCollisionConfiguration* collisionConfiguration);
+	
+	virtual ~btMultiBodyDynamicsWorld ();
+
+	virtual void	addMultiBody(btMultiBody* body, short group= btBroadphaseProxy::DefaultFilter, short mask=btBroadphaseProxy::AllFilter);
+
+	virtual void	removeMultiBody(btMultiBody* body);
+
+	virtual void	addMultiBodyConstraint( btMultiBodyConstraint* constraint);
+
+	virtual void	removeMultiBodyConstraint( btMultiBodyConstraint* constraint);
+};
+#endif //BT_MULTIBODY_DYNAMICS_WORLD_H