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diff --git a/game/server/ai_initutils.h b/game/server/ai_initutils.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:		AI Utility classes for building the initial AI Networks
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef AI_INITUTILS_H
+#define AI_INITUTILS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "ai_basenpc.h"
+#include "ai_node.h"
+
+//###########################################################
+//  >> HintNodeData
+//
+// This is a chunk of data that's passed to a hint node entity
+// when it's created from a CNodeEnt.
+//###########################################################
+enum HintIgnoreFacing_t
+{
+	HIF_NO,
+	HIF_YES,
+	HIF_DEFAULT,
+};
+
+
+struct HintNodeData
+{
+	string_t	strEntityName;
+	Vector		vecPosition;
+	short		nHintType;
+	int			nNodeID;
+	string_t	strGroup;
+	int			iDisabled;
+	string_t	iszActivityName;
+	int			nTargetWCNodeID;
+	HintIgnoreFacing_t fIgnoreFacing;
+	NPC_STATE	minState;
+	NPC_STATE	maxState;
+
+	int			nWCNodeID;			// Node ID assigned by worldcraft (not same as engine!)
+
+	DECLARE_SIMPLE_DATADESC();
+};
+
+//###########################################################
+//  >> CNodeEnt
+//
+// This is the entity that is loaded in from worldcraft.
+// It is only used to build the network and is deleted
+// immediately
+//###########################################################
+class CNodeEnt : public CServerOnlyPointEntity
+{
+	DECLARE_CLASS( CNodeEnt, CServerOnlyPointEntity );
+
+public:
+	virtual void SetOwnerEntity( CBaseEntity* pOwner ) { BaseClass::SetOwnerEntity( NULL ); }
+
+	static int			m_nNodeCount;
+
+	void	Spawn( void );
+	int		Spawn( const char *pMapData );
+
+	DECLARE_DATADESC();
+
+	CNodeEnt(void);
+
+public:
+	HintNodeData		m_NodeData;
+};
+
+//###########################################################
+// >> CAI_TestHull 
+//
+// a modelless clip hull that verifies reachable nodes by 
+// walking from every node to each of it's connections//
+//###########################################################
+class CAI_TestHull : public CAI_BaseNPC
+{
+	DECLARE_CLASS( CAI_TestHull, CAI_BaseNPC );
+private:
+	static CAI_TestHull*	pTestHull;								// Hull for testing connectivity
+
+public:
+	static CAI_TestHull*	GetTestHull(void);						// Get the test hull
+	static void				ReturnTestHull(void);					// Return the test hull
+
+	bool					bInUse;
+	virtual void			Precache();
+	void					Spawn(void);
+	virtual int				ObjectCaps( void ) { return BaseClass::ObjectCaps() & ~(FCAP_ACROSS_TRANSITION|FCAP_DONT_SAVE); }
+
+	virtual bool			IsJumpLegal(const Vector &startPos, const Vector &apex, const Vector &endPos) const;
+
+	~CAI_TestHull(void);
+};
+
+
+#endif // AI_INITUTILS_H