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diff --git a/extern/bullet2/BulletCollision/NarrowPhaseCollision/btRaycastCallback.h b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btRaycastCallback.h
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+++ b/extern/bullet2/BulletCollision/NarrowPhaseCollision/btRaycastCallback.h
@@ -0,0 +1,71 @@
+/*
+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 RAYCAST_TRI_CALLBACK_H
+#define RAYCAST_TRI_CALLBACK_H
+
+#include "BulletCollision/CollisionShapes/btTriangleCallback.h"
+#include "LinearMath/btTransform.h"
+struct btBroadphaseProxy;
+class btConvexShape;
+
+class  btTriangleRaycastCallback: public btTriangleCallback
+{
+public:
+
+	//input
+	btVector3 m_from;
+	btVector3 m_to;
+
+   //@BP Mod - allow backface filtering and unflipped normals
+   enum EFlags
+   {
+      kF_None                 = 0,
+      kF_FilterBackfaces      = 1 << 0,
+      kF_KeepUnflippedNormal  = 1 << 1,   // Prevents returned face normal getting flipped when a ray hits a back-facing triangle
+
+      kF_Terminator        = 0xFFFFFFFF
+   };
+   unsigned int m_flags;
+
+	btScalar	m_hitFraction;
+
+	btTriangleRaycastCallback(const btVector3& from,const btVector3& to, unsigned int flags=0);
+	
+	virtual void processTriangle(btVector3* triangle, int partId, int triangleIndex);
+
+	virtual btScalar reportHit(const btVector3& hitNormalLocal, btScalar hitFraction, int partId, int triangleIndex ) = 0;
+	
+};
+
+class btTriangleConvexcastCallback : public btTriangleCallback
+{
+public:
+	const btConvexShape* m_convexShape;
+	btTransform m_convexShapeFrom;
+	btTransform m_convexShapeTo;
+	btTransform m_triangleToWorld;
+	btScalar m_hitFraction;
+    btScalar m_triangleCollisionMargin;
+
+	btTriangleConvexcastCallback (const btConvexShape* convexShape, const btTransform& convexShapeFrom, const btTransform& convexShapeTo, const btTransform& triangleToWorld, const btScalar triangleCollisionMargin);
+
+	virtual void processTriangle (btVector3* triangle, int partId, int triangleIndex);
+
+	virtual btScalar reportHit (const btVector3& hitNormalLocal, const btVector3& hitPointLocal, btScalar hitFraction, int partId, int triangleIndex) = 0;
+};
+
+#endif //RAYCAST_TRI_CALLBACK_H
+