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diff --git a/game/shared/hl2/env_headcrabcanister_shared.h b/game/shared/hl2/env_headcrabcanister_shared.h
new file mode 100644
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+++ b/game/shared/hl2/env_headcrabcanister_shared.h
@@ -0,0 +1,180 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef ENV_HEADCRABCANISTER_SHARED_H
+#define ENV_HEADCRABCANISTER_SHARED_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "vstdlib/random.h"
+#include "mathlib/vector.h"
+#include "utlvector.h"
+#include "networkvar.h"
+
+//=============================================================================
+//
+// Shared HeadcrabCanister Class
+//
+class CEnvHeadcrabCanisterShared
+{
+	DECLARE_CLASS_NOBASE( CEnvHeadcrabCanisterShared );
+	DECLARE_EMBEDDED_NETWORKVAR();
+	DECLARE_SIMPLE_DATADESC();
+
+public:
+	CEnvHeadcrabCanisterShared();
+
+	// Initialization.
+	void InitInWorld( float flLaunchTime, const Vector &vecStartPosition, const QAngle &vecStartAngles, const Vector &vecDirection, const Vector &vecImpactPosition, bool bLaunchedFromWithinWorld = false );
+	void InitInSkybox( float flLaunchTime, const Vector &vecStartPosition, const QAngle &vecStartAngles, const Vector &vecDirection, const Vector &vecImpactPosition, const Vector &vecSkyboxOrigin, float flSkyboxScale );
+
+	// Returns the position of the object at a given time.
+	void GetPositionAtTime( float flTime, Vector &vecPosition, QAngle &vecAngles );
+
+	// Returns whether or not the object is the the skybox
+	bool IsInSkybox( );
+
+	// Returns the time at which it enters the world
+	float GetEnterWorldTime() const;
+
+	// Convert from skybox to world
+	void ConvertFromSkyboxToWorld();
+
+	// Did we impact?
+	bool DidImpact( float flTime ) const;
+
+public:
+	// The objects initial parametric conditions.
+	CNetworkVector(	m_vecStartPosition );
+	CNetworkVector(	m_vecEnterWorldPosition );
+	CNetworkVector(	m_vecDirection );	
+	CNetworkQAngle( m_vecStartAngles );
+
+	CNetworkVar( float,	m_flFlightTime );
+	CNetworkVar( float,	m_flFlightSpeed );
+	CNetworkVar( float,	m_flLaunchTime );
+
+	CNetworkVar( float, m_flInitialZSpeed );
+	CNetworkVar( float, m_flZAcceleration );
+	CNetworkVar( float, m_flHorizSpeed );
+
+	CNetworkVar( bool, m_bLaunchedFromWithinWorld );
+
+	CNetworkVector( m_vecParabolaDirection );
+
+	// The time at which the canister enters the skybox
+	CNetworkVar( float,	m_flWorldEnterTime );
+
+	// Skybox data
+	CNetworkVector(	m_vecSkyboxOrigin );
+	CNetworkVar( float, m_flSkyboxScale );
+	CNetworkVar( bool, m_bInSkybox );
+
+private:
+	float	m_flLaunchHeight;
+
+	// Calculate the enter time. (called from Init)
+	void CalcEnterTime( const Vector &vecTriggerMins, const Vector &vecTriggerMaxs );			
+
+	friend class CEnvHeadcrabCanister;
+	friend class C_EnvHeadcrabCanister;
+};
+
+/*
+//=============================================================================
+//
+// HeadcrabCanister Factory Interface
+//
+abstract_class IHeadcrabCanisterFactory
+{
+public:
+
+	virtual void CreateHeadcrabCanister( int nID, int iType, 
+		                       const Vector &vecPosition, const Vector &vecDirection, 
+		                       float flSpeed, float flStartTime, float flDamageRadius,
+							   const Vector &vecTriggerMins, const Vector &vecTriggerMaxs ) = 0;
+};
+
+//=============================================================================
+//
+// Shared HeadcrabCanister Spawner Class
+//
+class CEnvHeadcrabCanisterSpawnerShared
+{
+public:
+	DECLARE_CLASS_NOBASE( CEnvHeadcrabCanisterSpawnerShared );
+	DECLARE_EMBEDDED_NETWORKVAR();
+
+	//-------------------------------------------------------------------------
+	// Initialization.
+	//-------------------------------------------------------------------------
+	CEnvHeadcrabCanisterSpawnerShared();
+	void	Init( IHeadcrabCanisterFactory *pFactory, int nRandomSeed, float flTime,
+				  const Vector &vecMinBounds, const Vector &vecMaxBounds,
+				  const Vector &vecTriggerMins, const Vector &vecTriggerMaxs );
+
+	//-------------------------------------------------------------------------
+	// Method to generate HeadcrabCanisters. 
+	// Time passed in here is global time, not delta time.
+	// The function returns the time at which it must be called again.
+	//-------------------------------------------------------------------------
+	float	HeadcrabCanisterThink( float flTime );
+
+	//-------------------------------------------------------------------------
+	// Add HeadcrabCanister target data, used to determine HeadcrabCanister travel direction.
+	//-------------------------------------------------------------------------
+	void	AddToTargetList( const Vector &vecPosition, float flRadius );
+
+	// Debugging!
+	int		GetRandomInt( int nMin, int nMax );
+	float	GetRandomFloat( float flMin, float flMax );
+
+public:
+
+	// Factory.
+	IHeadcrabCanisterFactory					*m_pFactory;			// HeadcrabCanister creation factory.
+
+	int								m_nHeadcrabCanisterCount;			// Number of HeadcrabCanisters created - used as IDs
+
+	// Initial spawner data.
+	CNetworkVar( float, m_flStartTime );			// Start time.
+	CNetworkVar( int, m_nRandomSeed );			// The random number stream seed.
+
+	CNetworkVar( int, m_iHeadcrabCanisterType );			// Type of HeadcrabCanister.
+	float							m_flHeadcrabCanisterDamageRadius;	// HeadcrabCanister damage radius.
+	CNetworkVar( bool, m_bSkybox );				// Is the spawner in the skybox?
+
+	CNetworkVar( float, m_flMinSpawnTime );		// Spawn time - Min
+	CNetworkVar( float, m_flMaxSpawnTime );		//              Max
+	CNetworkVar( int, m_nMinSpawnCount );		// Number of HeadcrabCanisters to spawn - Min
+	CNetworkVar( int, m_nMaxSpawnCount );		//							    Max
+	CNetworkVector( m_vecMinBounds );			// Spawner volume (space) - Min
+	CNetworkVector( m_vecMaxBounds );			//                          Max
+	CNetworkVar( float, m_flMinSpeed );			// HeadcrabCanister speed - Min
+	CNetworkVar( float, m_flMaxSpeed );			//                Max
+	CNetworkVector( m_vecTriggerMins );		// World Bounds (Trigger) in 3D Skybox - Min
+	CNetworkVector( m_vecTriggerMaxs );		//                                       Max
+	Vector							m_vecTriggerCenter;
+
+	// Generated data.
+	int								m_nRandomCallCount;		// Debug! Keep track of number steam calls.
+	float							m_flNextSpawnTime;		// Next HeadcrabCanister spawn time (random).
+	CUniformRandomStream			m_NumberStream;			// Used to generate random numbers.	
+
+	// Use "Targets" to determine HeadcrabCanister direction(s).
+	struct HeadcrabCanistertarget_t
+	{
+		Vector		m_vecPosition;
+		float		m_flRadius;
+	};
+	CUtlVector<HeadcrabCanistertarget_t>	m_aTargets;
+};
+*/
+
+#endif // ENV_HEADCRAB_CANISTER_SHARED_H