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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 BT_DISCRETE_COLLISION_DETECTOR1_INTERFACE_H
+#define BT_DISCRETE_COLLISION_DETECTOR1_INTERFACE_H
+
+#include "LinearMath/btTransform.h"
+#include "LinearMath/btVector3.h"
+
+/// This interface is made to be used by an iterative approach to do TimeOfImpact calculations
+/// This interface allows to query for closest points and penetration depth between two (convex) objects
+/// the closest point is on the second object (B), and the normal points from the surface on B towards A.
+/// distance is between closest points on B and closest point on A. So you can calculate closest point on A
+/// by taking closestPointInA = closestPointInB + m_distance * m_normalOnSurfaceB
+struct btDiscreteCollisionDetectorInterface
+{
+	
+	struct Result
+	{
+	
+		virtual ~Result(){}	
+
+		///setShapeIdentifiersA/B provides experimental support for per-triangle material / custom material combiner
+		virtual void setShapeIdentifiersA(int partId0,int index0)=0;
+		virtual void setShapeIdentifiersB(int partId1,int index1)=0;
+		virtual void addContactPoint(const btVector3& normalOnBInWorld,const btVector3& pointInWorld,btScalar depth)=0;
+	};
+
+	struct ClosestPointInput
+	{
+		ClosestPointInput()
+			:m_maximumDistanceSquared(btScalar(BT_LARGE_FLOAT))
+		{
+		}
+
+		btTransform m_transformA;
+		btTransform m_transformB;
+		btScalar	m_maximumDistanceSquared;
+	};
+
+	virtual ~btDiscreteCollisionDetectorInterface() {};
+
+	//
+	// give either closest points (distance > 0) or penetration (distance)
+	// the normal always points from B towards A
+	//
+	virtual void	getClosestPoints(const ClosestPointInput& input,Result& output,class btIDebugDraw* debugDraw,bool swapResults=false) = 0;
+
+};
+
+struct btStorageResult : public btDiscreteCollisionDetectorInterface::Result
+{
+		btVector3	m_normalOnSurfaceB;
+		btVector3	m_closestPointInB;
+		btScalar	m_distance; //negative means penetration !
+
+    protected:
+		btStorageResult() : m_distance(btScalar(BT_LARGE_FLOAT))
+		{
+		}
+		
+	public:
+		virtual ~btStorageResult() {};
+
+		virtual void addContactPoint(const btVector3& normalOnBInWorld,const btVector3& pointInWorld,btScalar depth)
+		{
+			if (depth < m_distance)
+			{
+				m_normalOnSurfaceB = normalOnBInWorld;
+				m_closestPointInB = pointInWorld;
+				m_distance = depth;
+			}
+		}
+};
+
+#endif //BT_DISCRETE_COLLISION_DETECTOR1_INTERFACE_H
+