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diff --git a/thirdparty/bullet/BulletCollision/CollisionShapes/btPolyhedralConvexShape.h b/thirdparty/bullet/BulletCollision/CollisionShapes/btPolyhedralConvexShape.h
deleted file mode 100644
index b3ffab7a23..0000000000
--- a/thirdparty/bullet/BulletCollision/CollisionShapes/btPolyhedralConvexShape.h
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
-Bullet Continuous Collision Detection and Physics Library
-Copyright (c) 2003-2009 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_POLYHEDRAL_CONVEX_SHAPE_H
-#define BT_POLYHEDRAL_CONVEX_SHAPE_H
-
-#include "LinearMath/btMatrix3x3.h"
-#include "btConvexInternalShape.h"
-class btConvexPolyhedron;
-
-///The btPolyhedralConvexShape is an internal interface class for polyhedral convex shapes.
-ATTRIBUTE_ALIGNED16(class)
-btPolyhedralConvexShape : public btConvexInternalShape
-{
-protected:
-	btConvexPolyhedron* m_polyhedron;
-
-public:
-	BT_DECLARE_ALIGNED_ALLOCATOR();
-
-	btPolyhedralConvexShape();
-
-	virtual ~btPolyhedralConvexShape();
-
-	///optional method mainly used to generate multiple contact points by clipping polyhedral features (faces/edges)
-	///experimental/work-in-progress
-	virtual bool initializePolyhedralFeatures(int shiftVerticesByMargin = 0);
-
-	virtual void setPolyhedralFeatures(btConvexPolyhedron & polyhedron);
-
-	const btConvexPolyhedron* getConvexPolyhedron() const
-	{
-		return m_polyhedron;
-	}
-
-	//brute force implementations
-
-	virtual btVector3 localGetSupportingVertexWithoutMargin(const btVector3& vec) const;
-	virtual void batchedUnitVectorGetSupportingVertexWithoutMargin(const btVector3* vectors, btVector3* supportVerticesOut, int numVectors) const;
-
-	virtual void calculateLocalInertia(btScalar mass, btVector3 & inertia) const;
-
-	virtual int getNumVertices() const = 0;
-	virtual int getNumEdges() const = 0;
-	virtual void getEdge(int i, btVector3& pa, btVector3& pb) const = 0;
-	virtual void getVertex(int i, btVector3& vtx) const = 0;
-	virtual int getNumPlanes() const = 0;
-	virtual void getPlane(btVector3 & planeNormal, btVector3 & planeSupport, int i) const = 0;
-	//	virtual int getIndex(int i) const = 0 ;
-
-	virtual bool isInside(const btVector3& pt, btScalar tolerance) const = 0;
-};
-
-///The btPolyhedralConvexAabbCachingShape adds aabb caching to the btPolyhedralConvexShape
-class btPolyhedralConvexAabbCachingShape : public btPolyhedralConvexShape
-{
-	btVector3 m_localAabbMin;
-	btVector3 m_localAabbMax;
-	bool m_isLocalAabbValid;
-
-protected:
-	void setCachedLocalAabb(const btVector3& aabbMin, const btVector3& aabbMax)
-	{
-		m_isLocalAabbValid = true;
-		m_localAabbMin = aabbMin;
-		m_localAabbMax = aabbMax;
-	}
-
-	inline void getCachedLocalAabb(btVector3& aabbMin, btVector3& aabbMax) const
-	{
-		btAssert(m_isLocalAabbValid);
-		aabbMin = m_localAabbMin;
-		aabbMax = m_localAabbMax;
-	}
-
-protected:
-	btPolyhedralConvexAabbCachingShape();
-
-public:
-	inline void getNonvirtualAabb(const btTransform& trans, btVector3& aabbMin, btVector3& aabbMax, btScalar margin) const
-	{
-		//lazy evaluation of local aabb
-		btAssert(m_isLocalAabbValid);
-		btTransformAabb(m_localAabbMin, m_localAabbMax, margin, trans, aabbMin, aabbMax);
-	}
-
-	virtual void setLocalScaling(const btVector3& scaling);
-
-	virtual void getAabb(const btTransform& t, btVector3& aabbMin, btVector3& aabbMax) const;
-
-	void recalcLocalAabb();
-};
-
-#endif  //BT_POLYHEDRAL_CONVEX_SHAPE_H