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diff --git a/public/vphysics/friction.h b/public/vphysics/friction.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef FRICTION_H
+#define FRICTION_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+// NOTE: This is an iterator for the contact points on an object
+// NOTE: This should only be used temporarily.  Holding one of these
+// NOTE: across collision callbacks or calls into simulation will cause errors!
+// NOTE: VPHYSICS may choose to make the data contained within this object invalid 
+// NOTE: any time simulation is run.
+class IPhysicsFrictionSnapshot
+{
+public:
+	virtual ~IPhysicsFrictionSnapshot() {}
+
+	virtual bool IsValid() = 0;
+
+	// Object 0 is this object, Object 1 is the other object
+	virtual IPhysicsObject *GetObject( int index ) = 0;
+	virtual int GetMaterial( int index ) = 0;
+
+	virtual void GetContactPoint( Vector &out ) = 0;
+	
+	// points away from source object
+	virtual void GetSurfaceNormal( Vector &out ) = 0;
+	virtual float GetNormalForce() = 0;
+	virtual float GetEnergyAbsorbed() = 0;
+
+	// recompute friction (useful if dynamically altering materials/mass)
+	virtual void RecomputeFriction() = 0;
+	// clear all friction force at this contact point
+	virtual void ClearFrictionForce() = 0;
+
+	virtual void MarkContactForDelete() = 0;
+	virtual void DeleteAllMarkedContacts( bool wakeObjects ) = 0;
+
+	// Move to the next friction data for this object
+	virtual void NextFrictionData() = 0;
+	virtual float GetFrictionCoefficient() = 0;
+};
+
+
+
+#endif // FRICTION_H