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diff --git a/hammer/mapoverlaytrans.h b/hammer/mapoverlaytrans.h
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+++ b/hammer/mapoverlaytrans.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+//
+//=============================================================================
+
+#ifndef OVERLAYTRANS_H
+#define OVERLAYTRANS_H
+#pragma once
+
+#include "utlvector.h"
+#include "mathlib/vector.h"
+#include "mathlib/vector2d.h"
+#include "MapHelper.h"
+
+class IEditorTexture;
+class CHelperInfo;
+class CMapEntity;
+class CMapFace;
+
+struct ShoreEntityData_t
+{
+	IEditorTexture	*m_pTexture;
+	Vector2D		m_vecLengthTexcoord;
+	Vector2D		m_vecWidthTexcoord;
+	float			m_flWidths[2];
+};
+
+//=============================================================================
+//
+// Overlay Transition Entity Helper
+//
+class CMapOverlayTransition : public CMapHelper
+{
+public:
+
+	DECLARE_MAPCLASS(CMapOverlayTransition,CMapHelper)
+
+	CMapOverlayTransition();
+	~CMapOverlayTransition();
+
+	// Factory for building from a list of string parameters.
+	static CMapClass *Create( CHelperInfo *pInfo, CMapEntity *pParent );
+
+	// Virtual/Interface Implementation.
+	virtual void PostloadWorld( CMapWorld *pWorld );
+
+	void CalcBounds( BOOL bFullUpdate = FALSE );
+
+	virtual CMapClass *Copy( bool bUpdateDependencies );
+	virtual CMapClass *CopyFrom( CMapClass *pObject, bool bUpdateDependencies );
+
+	virtual void OnParentKeyChanged( const char* szKey, const char* szValue );
+	virtual void OnNotifyDependent( CMapClass *pObject, Notify_Dependent_t eNotifyType );
+
+	virtual void OnAddToWorld(CMapWorld *pWorld);
+	virtual void OnRemoveFromWorld(CMapWorld *pWorld, bool bNotifyChildren);
+
+	void DoTransform( const VMatrix& matrix );
+	
+	void OnPaste( CMapClass *pCopy, CMapWorld *pSourceWorld, CMapWorld *pDestWorld, 
+				  const CMapObjectList &OriginalList, CMapObjectList &NewList);
+	void OnClone( CMapClass *pClone, CMapWorld *pWorld, 
+				  const CMapObjectList &OriginalList, CMapObjectList &NewList );
+	void OnUndoRedo( void );
+
+	bool OnApply( void );
+
+	void Render3D( CRender3D *pRender );
+
+	inline virtual bool IsVisualElement( void ) { return true; }
+	inline virtual bool ShouldRenderLast( void ) { return true; }
+	inline const char* GetDescription() { return ( "Overlay Transition" ); }
+
+	ChunkFileResult_t LoadVMF( CChunkFile *pFile );
+	ChunkFileResult_t SaveVMF( CChunkFile *pFile, CSaveInfo *pSaveInfo );
+	bool ShouldSerialize( void ) { return true; }
+
+private:
+
+	bool BuildFaceCaches( void );
+
+	static ChunkFileResult_t OverlayDataCallback( CChunkFile *pFile, CMapDisp *pDisp );
+	static ChunkFileResult_t OverlayDataKeyCallback( const char *szKey, const char *szValue, CMapDisp *pDisp );
+
+private:
+
+	bool					m_bIsWater;
+	ShoreEntityData_t		m_ShoreData;
+
+	CUtlVector<CMapFace*>	m_aFaceCache1;
+	CUtlVector<CMapFace*>	m_aFaceCache2;
+
+	int						m_nShorelineId;
+	CUtlVector<CMapEntity*>	m_aOverlayChildren;
+
+	bool					m_bDebugDraw;
+};
+
+
+#endif // OVERLAYTRANS_H
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