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diff --git a/public/tier3/mdlutils.h b/public/tier3/mdlutils.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: A higher level link library for general use in the game and tools.
+//
+//===========================================================================//
+
+
+#ifndef MDLUTILS_H
+#define MDLUTILS_H
+
+#if defined( _WIN32 )
+#pragma once
+#endif
+
+#include "datacache/imdlcache.h"
+#include "mathlib/vector.h"
+#include "Color.h"
+#include "studio.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+struct matrix3x4_t;
+
+struct MDLSquenceLayer_t
+{
+	int		m_nSequenceIndex;
+	float	m_flWeight;
+	bool	m_bNoLoop;
+	float	m_flCycleBeganAt;
+};
+
+//-----------------------------------------------------------------------------
+// Class containing simplistic MDL state for use in rendering
+//-----------------------------------------------------------------------------
+class CMDL
+{
+public:
+	CMDL();
+	~CMDL();
+
+	void SetMDL( MDLHandle_t h );
+	MDLHandle_t GetMDL() const;
+
+	// Simple version of drawing; sets up bones for you
+	void Draw( const matrix3x4_t& rootToWorld );
+
+	// NOTE: This version of draw assumes you've filled in the bone to world
+	// matrix yourself by calling IStudioRender::LockBoneMatrices. The pointer
+	// returned by that method needs to be passed into here
+	void Draw( const matrix3x4_t& rootToWorld, const matrix3x4_t *pBoneToWorld );
+
+
+	void SetUpBones( const matrix3x4_t& shapeToWorld, int nMaxBoneCount, matrix3x4_t *pOutputMatrices, const float *pPoseParameters = NULL, MDLSquenceLayer_t *pSequenceLayers = NULL, int nNumSequenceLayers = 0 );
+	void SetupBonesWithBoneMerge( const CStudioHdr *pMergeHdr, matrix3x4_t *pMergeBoneToWorld, 
+		const CStudioHdr *pFollow, const matrix3x4_t *pFollowBoneToWorld, const matrix3x4_t &matModelToWorld );
+	
+	studiohdr_t *GetStudioHdr();
+
+private:
+	void UnreferenceMDL();
+
+public:
+	MDLHandle_t	m_MDLHandle;
+	Color		m_Color;
+	int			m_nSkin;
+	int			m_nBody;
+	int			m_nSequence;
+	int			m_nLOD;
+	float		m_flPlaybackRate;
+	float		m_flTime;
+	float		m_pFlexControls[ MAXSTUDIOFLEXCTRL * 4 ];
+	Vector		m_vecViewTarget;
+	bool		m_bWorldSpaceViewTarget;
+	void		*m_pProxyData;
+};
+
+
+//-----------------------------------------------------------------------------
+// Returns the bounding box for the model
+//-----------------------------------------------------------------------------
+void GetMDLBoundingBox( Vector *pMins, Vector *pMaxs, MDLHandle_t h, int nSequence );
+
+//-----------------------------------------------------------------------------
+// Returns the radius of the model as measured from the origin
+//-----------------------------------------------------------------------------
+float GetMDLRadius( MDLHandle_t h, int nSequence );
+
+//-----------------------------------------------------------------------------
+// Returns a more accurate bounding sphere
+//-----------------------------------------------------------------------------
+void GetMDLBoundingSphere( Vector *pVecCenter, float *pRadius, MDLHandle_t h, int nSequence );
+
+
+#endif // MDLUTILS_H
+