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diff --git a/game/shared/tf2/tf_shieldshared.h b/game/shared/tf2/tf_shieldshared.h
new file mode 100644
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--- /dev/null
+++ b/game/shared/tf2/tf_shieldshared.h
@@ -0,0 +1,262 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef TF_SHIELD_SHARED_H
+#define TF_SHIELD_SHARED_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mathlib/mathlib.h"
+#include "mathlib/vector.h"
+#include "mathlib/vmatrix.h"
+#include "utlvector.h"
+#include "SheetSimulator.h"
+#include "predictable_entity.h"
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Shield (mobile version)
+//-----------------------------------------------------------------------------
+enum
+{
+	SHIELD_NUM_HORIZONTAL_POINTS = 8,
+	SHIELD_NUM_VERTICAL_POINTS = 8,
+	SHIELD_NUM_CONTROL_POINTS = SHIELD_NUM_HORIZONTAL_POINTS * SHIELD_NUM_VERTICAL_POINTS,
+	SHIELD_INITIAL_THETA = 135,
+	SHIELD_INITIAL_PHI = 90,
+	SHIELD_HORIZONTAL_PANEL_COUNT = (SHIELD_NUM_HORIZONTAL_POINTS - 1),
+	SHIELD_VERTICAL_PANEL_COUNT = (SHIELD_NUM_VERTICAL_POINTS - 1),
+	SHIELD_PANELS_COUNT = (SHIELD_HORIZONTAL_PANEL_COUNT * SHIELD_VERTICAL_PANEL_COUNT),
+	SHIELD_VERTEX_BYTES = (SHIELD_NUM_CONTROL_POINTS + 7) >> 3,
+	SHIELD_TIME_SUBVISIBIONS = 2
+};
+
+//--------------------------------------------------------------------------
+// Mobile shield state flags
+//--------------------------------------------------------------------------
+enum
+{
+	SHIELD_MOBILE_EMP = 0x1
+};
+
+
+//--------------------------------------------------------------------------
+// Shield grenade state
+//--------------------------------------------------------------------------
+enum
+{
+	SHIELD_FLAT_EMP = 0x1,
+	SHIELD_FLAT_INACTIVE = 0x2
+};
+
+enum
+{
+	SHIELD_FLAT_SHUTDOWN_TIME = 1
+};
+
+enum
+{
+	SHIELD_GRENADE_WIDTH = 150,
+	SHIELD_GRENADE_HEIGHT = 150,
+};
+
+
+#define SHIELD_DAMAGE_CHANGE_TIME	1.5f
+
+
+//-----------------------------------------------------------------------------
+// Amount of time it takes to fade the shield in or out due to EMP 
+//-----------------------------------------------------------------------------
+#define SHIELD_EMP_FADE_TIME 0.7f
+
+
+//-----------------------------------------------------------------------------
+// Amount of time it takes a point to wobble when EMPed
+//-----------------------------------------------------------------------------
+#define SHIELD_EMP_WOBBLE_TIME 0.1f
+
+
+//-----------------------------------------------------------------------------
+// Methods we must install into the effect
+//-----------------------------------------------------------------------------
+class IActiveVertList
+{
+public:
+	virtual int		GetActiveVertState( int iVert ) = 0;
+	virtual void	SetActiveVertState( int iVert, int bOn ) = 0;
+};
+
+
+class CShieldEffect
+{
+	DECLARE_CLASS_NOBASE( CShieldEffect );
+	DECLARE_PREDICTABLE();
+
+public:
+	CShieldEffect();
+
+	void Precache();
+	void Spawn(const Vector& currentPosition, const QAngle& currentAngles);
+
+	// Sets the collision group
+	void SetCollisionGroup( int group );
+
+	// Computes the opacity....
+	float ComputeOpacity( const Vector& pt, const Vector& center ) const;
+
+	// Computes the bounds
+	void ComputeBounds( Vector& mins, Vector& maxs );
+
+	// Simulation
+	void Simulate( float dt );
+
+	// Sets desired orientation + position
+	void SetDesiredOrigin( const Vector& origin );
+	void SetDesiredAngles( const QAngle& angles );
+	const QAngle& GetDesiredAngles() const;
+
+	// Hooks in active bits...
+	void SetActiveVertexList( IActiveVertList *pActiveVerts );
+
+	// Gets a point...
+	const Vector& GetPoint( int x, int y ) const;
+	const Vector& GetPoint( int i ) const;
+	Vector& GetPoint( int i );
+
+	// Computes control points
+	void ComputeControlPoints();
+
+	// The current angles (computed by Simulate on the server)
+	const QAngle& GetCurrentAngles() const;
+	void SetCurrentAngles( const QAngle& angles);
+
+	// The current position (computed by Simulate on the server)
+	const Vector& GetCurrentPosition();
+	void SetCurrentPosition( const Vector& pos );
+
+	// Compute vertex activity
+	void ComputeVertexActivity();
+
+	// Recompute whether the panels are active or not
+	void ComputePanelActivity();
+
+	// Is a particular vertex active?
+	bool IsVertexActive( int x, int y ) const;
+
+	// Is a particular panel active?
+	bool IsPanelActive( int x, int y ) const;
+
+	// Gets a control point (for collision)
+	const Vector& GetControlPoint( int i ) const { return m_pControlPoint[i]; }
+
+	// Returns the panel size (for collision testing)
+	void GetPanelSize( Vector& mins, Vector& maxs ) const;
+
+	// Change the angular spring constant. This affects how fast the shield rotates to face the angles
+	// given in SetAngles. Higher numbers are more responsive, but if you go too high (around 40), it will
+	// jump past the specified angles and wiggle a little bit.
+	void SetAngularSpringConstant( float flConstant );
+
+	// Set the shield theta & phi
+	void SetThetaPhi( float flTheta, float flPhi );
+
+	// Returns the render bounds
+	const Vector& GetRenderMins() const;
+	const Vector& GetRenderMaxs() const;
+
+private:
+	// Simulation set up
+	void ComputeRestPositions();
+	void SetShieldPanelSize( Vector& mins, Vector& maxs );
+	void SimulateTranslation( float dt );
+	void SimulateRotation( float dt, const Vector& forward );
+	void ComputeOrientationMatrix();
+
+	float m_RestLength;
+	float m_PlaneDist;
+	float m_ShieldTheta;
+	float m_ShieldPhi;
+
+	// Spring constants
+	float m_SpringConstant;
+	float m_DampConstant;
+	float m_ViscousDrag;
+	float m_Mass;
+
+	float m_AngularSpringConstant;
+	float m_AngularViscousDrag;
+
+	// collision group
+	int		m_CollisionGroup;
+
+	// Directions of the control points in shield space
+	Vector	m_pFixedDirection[SHIELD_NUM_CONTROL_POINTS];
+
+	// Position of the control points in world space
+	Vector	m_pControlPoint[SHIELD_NUM_CONTROL_POINTS];
+
+	// Bitfield indicating which vertices are active
+	IActiveVertList *m_pActiveVerts;
+
+	// Bitfield indicating which panels are active
+	bool	m_pActivePanels[SHIELD_PANELS_COUNT];
+
+	// Which point on the shield to test next
+	int		m_TestPoint;
+	int		m_PointList[SHIELD_NUM_CONTROL_POINTS];
+
+	// desired position + orientation
+	Vector	m_vecDesiredOrigin;
+	QAngle	m_angDesiredAngles;
+
+	// collision box
+	Vector  m_PanelBoxMin;
+	Vector	m_PanelBoxMax;
+
+	// Render bounds (shield space)
+	Vector  m_vecRenderMins;
+	Vector	m_vecRenderMaxs;
+
+	// Actual center position (relative to m_Origin)
+	// + velocity (world space)
+	Vector	m_Position;
+	Vector	m_Velocity;
+
+	// our current orientation....
+	QAngle  m_CurrentAngles;
+	VMatrix	m_Orientation;
+	float	m_Theta;
+	float	m_Phi;
+	float	m_ThetaVelocity;
+	float	m_PhiVelocity;
+};
+
+
+//-----------------------------------------------------------------------------
+// Inline methods
+//-----------------------------------------------------------------------------
+inline const QAngle& CShieldEffect::GetCurrentAngles() const 
+{ 
+	return m_CurrentAngles; 
+}
+
+//-----------------------------------------------------------------------------
+// Returns the render bounds
+//-----------------------------------------------------------------------------
+inline const Vector& CShieldEffect::GetRenderMins() const
+{
+	return m_vecRenderMins;
+}
+
+inline const Vector& CShieldEffect::GetRenderMaxs() const
+{
+	return m_vecRenderMaxs;
+}
+
+
+#endif // TF_SHIELD_SHARED_H