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diff --git a/hammer/dispmanager.h b/hammer/dispmanager.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef DISPMANAGER_H
+#define DISPMANAGER_H
+#pragma once
+
+class CMapDisp;
+
+//=============================================================================
+//
+// Global Displacement Manager
+//
+typedef unsigned short EditDispHandle_t;
+enum
+{
+	EDITDISPHANDLE_INVALID = ( EditDispHandle_t )~0
+};
+
+class IEditDispMgr
+{
+public:
+
+	// creation/destruction
+	virtual EditDispHandle_t Create( void ) = 0;
+	virtual void Destroy( EditDispHandle_t handle ) = 0;
+
+	virtual CMapDisp *GetDisp( EditDispHandle_t handle ) = 0;
+};
+
+IEditDispMgr *EditDispMgr( void );
+
+
+//=============================================================================
+//
+// World Displacement Manager(s)
+//
+class IWorldEditDispMgr
+{
+public:
+
+	virtual ~IWorldEditDispMgr() {}
+
+	//
+	// World List
+	//
+	virtual int WorldCount( void ) = 0;
+	virtual CMapDisp *GetFromWorld( int iWorldList ) = 0;
+	virtual CMapDisp *GetFromWorld( EditDispHandle_t handle ) = 0;
+
+	virtual void AddToWorld( EditDispHandle_t handle ) = 0;
+	virtual void RemoveFromWorld( EditDispHandle_t handle ) = 0;
+	
+	virtual void FindWorldNeighbors( EditDispHandle_t handle ) = 0;
+	
+	//
+	// Selection List
+	//
+	virtual int SelectCount( void ) = 0;
+	virtual void SelectClear( void ) = 0;
+	virtual CMapDisp *GetFromSelect( int iSelectList ) = 0;
+
+	virtual void AddToSelect( EditDispHandle_t handle ) = 0;
+	virtual void RemoveFromSelect( EditDispHandle_t handle ) = 0;
+	virtual bool IsInSelect( EditDispHandle_t handle ) = 0;
+
+	virtual void CatmullClarkSubdivide( void ) = 0;
+
+	//
+	// Undo
+	//
+	virtual void PreUndo( const char *pszMarkName ) = 0;
+	virtual void Undo( EditDispHandle_t handle, bool bAddNeighbors ) = 0;
+	virtual void PostUndo( void ) = 0;
+
+	//
+	// Helpers.
+	//
+	
+	// Return the # of points that these disps share (1=corner neighbors, 2=edge neighbors).
+	virtual int NumSharedPoints( CMapDisp *pDisp, CMapDisp *pNeighborDisp, int *edge1, int *edge2 ) = 0;
+};
+
+//
+// Global functions.
+//
+IWorldEditDispMgr *CreateWorldEditDispMgr( void );
+void DestroyWorldEditDispMgr( IWorldEditDispMgr **pDispMgr );
+
+
+#endif // DISPMANAGER_H