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diff --git a/hammer/subdiv.h b/hammer/subdiv.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef SUBDIV_H
+#define SUBDIV_H
+#pragma once
+
+class CMapDisp;
+class CSubdivEdge;
+class CSubdivQuad;
+
+//=============================================================================
+//
+// Class Subdivision Point
+//
+class CSubdivPoint
+{
+public:
+
+	enum { POINT_ORDINARY = 0,
+		   POINT_CORNER = 1,
+		   POINT_CREASE = 2 };
+	
+	enum { NUM_SUBDIV_EDGES = 8 };
+
+	Vector		m_Point;
+	Vector		m_Normal;
+	Vector		m_NewPoint;
+	Vector		m_NewNormal;
+	int			m_Type;
+	int			m_Valence;
+	CSubdivEdge	*m_pEdges[NUM_SUBDIV_EDGES];
+
+	void Clear( void );
+	void Copy( const CSubdivPoint *pFrom );
+
+	void CalcNewVertexPoint( void );
+	void CalcNewVertexNormal( void );
+
+	friend bool CompareSubdivPoints( const CSubdivPoint *pPoint1, const CSubdivPoint *pPoint2, float tolerance );
+	friend bool CompareSubdivPointToPoint( const CSubdivPoint *pSubdivPoint, const Vector& point, float tolerance );
+};
+
+
+//=============================================================================
+//
+// Class Subdivision Edge
+//
+class CSubdivEdge
+{
+public:
+
+	short		m_ndxPoint[2];
+	CSubdivQuad	*m_pQuads[2];
+	short		m_ndxQuadEdge[2];
+	float		m_Sharpness;
+	Vector		m_NewEdgePoint;
+	Vector		m_NewEdgeNormal;
+	bool		m_Active;
+
+	void Clear( void );
+	void Copy( const CSubdivEdge *pFrom );
+
+	void CalcNewEdgePoint( void );
+	void CalcNewEdgeNormal( void );
+
+	friend bool CompareSubdivEdges( const CSubdivEdge *pEdge1, const CSubdivEdge *pEdge2 );
+};
+
+
+//=============================================================================
+//
+// Class Subdivision Quad
+//
+class CSubdivQuad
+{
+public:
+
+	short	m_ndxQuad[4];		// quad indices -- see CSubdivManager
+	short	m_ndxVert[4];		// vert indices -- see CSubdivManager
+	short	m_ndxEdge[4];		// edge indices -- see CSubdivManager
+	Vector	m_Centroid;			// center of quad
+	Vector  m_Normal;			// quad normal
+
+	void GetCentroid( Vector& centroid );
+	void CalcCentroid( void );
+
+	void GetNormal( Vector& normal );
+	void CalcNormal( void );
+};
+
+
+//=============================================================================
+//
+// Class Subdivision Mesh
+//
+class CSubdivMesh
+{
+public:
+
+	//=========================================================================
+	//
+	// Creation/Destruction
+	//
+	CSubdivMesh();
+	~CSubdivMesh();
+
+	//=========================================================================
+	//
+	// 
+	//
+	inline void Clear( void );
+	void DoSubdivide( void );
+
+	//=========================================================================
+	//
+	// 
+	//
+	inline int GetPointCount( void );
+	int AddPoint( const Vector& point, const Vector& normal );
+	void RemovePoint( Vector& point );
+	inline void GetPoint( int index, Vector& point );
+	inline void GetNormal( int index, Vector& normal );
+
+	inline int GetEdgeCount( void );
+	int AddEdge( CSubdivEdge *edge );
+	void RemoveEdge( CSubdivEdge *edge );
+	inline void GetEdge( int index, CSubdivEdge *edge );
+
+private:
+
+//	enum { MAX_SUBDIV_POINTS = 32000 };
+//	enum { MAX_TREES = 64 };
+
+	int				m_PointCount;
+	int				m_MaxPointCount;
+	CSubdivPoint	*m_pPoints;
+//	CSubdivPoint	m_Points[MAX_SUBDIV_POINTS];		// mesh list of subdivision verts
+
+	int				m_EdgeCount;
+	int				m_MaxEdgeCount;
+	CSubdivEdge		*m_pEdges;
+//	CSubdivEdge	    m_Edges[MAX_SUBDIV_POINTS];			// mesh list of subdivision edges
+
+	int				m_TreeCount;
+	int				m_MaxTreeCount;
+	CSubdivQuad		**m_ppTrees;
+//	CSubdivQuad		*m_pTrees[MAX_TREES];
+
+	void CatmullClarkSubdivide( void );
+	int AddTree( CSubdivQuad *pTree );
+	int GetStartIndexFromLevel( int levelIndex );
+	int GetEndIndexFromLevel( int levelIndex );
+	void AddQuadToMesh( CSubdivQuad *pQuad );
+
+	inline void ClearEdges( void );
+
+	void CreateChildQuads( CSubdivQuad *pRoot, int quadIndex );
+	void SetEdgeData( CSubdivQuad *pRoot, int index, int parentIndex, int subdivIndex );
+	void CreateChildQuad1( CSubdivQuad *pRoot, int index, int parentIndex );
+	void CreateChildQuad2( CSubdivQuad *pRoot, int index, int parentIndex );
+	void CreateChildQuad3( CSubdivQuad *pRoot, int index, int parentIndex );
+	void CreateChildQuad4( CSubdivQuad *pRoot, int index, int parentIndex );
+
+	bool PreSubdivide( void );
+	void Subdivide( void );
+	void PostSubdivide( void );
+
+	bool AllocCache( int dispCount );
+	void FreeCache( void );
+};
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline void CSubdivMesh::Clear( void )
+{
+	m_PointCount = 0;
+	m_EdgeCount = 0;
+	m_TreeCount = 0;
+	
+	m_MaxPointCount = 0;
+	m_MaxEdgeCount = 0;
+	m_MaxTreeCount = 0;
+
+	m_pPoints = NULL;
+	m_pEdges = NULL;
+	m_ppTrees = NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline int CSubdivMesh::GetPointCount( void )
+{
+	return m_PointCount;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline void CSubdivMesh::GetPoint( int index, Vector& point )
+{
+	assert( index >= 0 );
+	assert( index < m_PointCount );
+
+	point = m_pPoints[index].m_Point;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline void CSubdivMesh::GetNormal( int index, Vector& normal )
+{
+	assert( index >= 0 );
+	assert( index < m_PointCount );
+
+	normal = m_pPoints[index].m_Normal;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline int CSubdivMesh::GetEdgeCount( void )
+{
+	return m_EdgeCount;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline void CSubdivMesh::GetEdge( int index, CSubdivEdge *edge )
+{
+	assert( index >= 0 );
+	assert( index < m_EdgeCount );
+
+	edge->Copy( &m_pEdges[index] );
+}
+
+
+#endif // SUBDIV_H
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