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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+//=============================================================================//
+
+#ifndef PHYSICS_FRICTION_H
+#define PHYSICS_FRICTION_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+class IVP_Real_Object;
+class IPhysicsFrictionSnapshot;
+
+IPhysicsFrictionSnapshot *CreateFrictionSnapshot( IVP_Real_Object *pObject );
+void DestroyFrictionSnapshot( IPhysicsFrictionSnapshot *pSnapshot );
+void DeleteAllFrictionPairs( IVP_Real_Object *pObject0, IVP_Real_Object *pObject1 );
+
+#endif // PHYSICS_FRICTION_H