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diff --git a/utils/vrad/incremental.h b/utils/vrad/incremental.h
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+++ b/utils/vrad/incremental.h
@@ -0,0 +1,175 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef INCREMENTAL_H
+#define INCREMENTAL_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+
+#include "iincremental.h"
+#include "utllinkedlist.h"
+#include "utlvector.h"
+#include "utlbuffer.h"
+#include "vrad.h"
+
+
+#define INCREMENTALFILE_VERSION	31241
+
+
+class CIncLight;
+
+
+class CLightValue
+{
+public:
+	float m_Dot;
+};
+
+
+class CLightFace
+{
+public:
+	unsigned short				m_FaceIndex;		// global face index
+	unsigned short				m_LightFacesIndex;	// index into CIncLight::m_LightFaces.
+
+	// The lightmap grid for this face. Only used while building lighting data for a face.
+	// Compressed into m_CompressedData immediately afterwards.
+	CUtlVector<CLightValue>		m_LightValues;
+
+	CUtlBuffer					m_CompressedData;
+	CIncLight					*m_pLight;
+};
+
+
+class CIncLight
+{
+public:
+					CIncLight();
+					~CIncLight();
+
+	CLightFace*		FindOrCreateLightFace( int iFace, int lmSize, bool *bNew=NULL );
+
+
+public:
+
+	CRITICAL_SECTION	m_CS;
+
+	// This is the light for which m_LightFaces was built.
+	dworldlight_t	m_Light;
+
+	CLightFace		*m_pCachedFaces[MAX_TOOL_THREADS+1];
+
+	// The list of faces that this light contributes to.
+	CUtlLinkedList<CLightFace*, unsigned short>	m_LightFaces;
+
+	// Largest value in intensity of light. Used to scale dot products up into a
+	// range where their values make sense.
+	float			m_flMaxIntensity;
+};
+
+
+class CIncrementalHeader
+{
+public:
+	class CLMSize
+	{
+	public:
+		unsigned char m_Width;
+		unsigned char m_Height;
+	};
+
+	CUtlVector<CLMSize>	m_FaceLightmapSizes;
+};
+
+
+class CIncremental : public IIncremental
+{
+public:
+
+						CIncremental();
+						~CIncremental();
+
+
+
+// IIncremental overrides.
+public:
+
+	virtual bool		Init( char const *pBSPFilename, char const *pIncrementalFilename );
+
+	// Load the light definitions out of the incremental file.
+	// Figure out which lights have changed.
+	// Change 'activelights' to only consist of new or changed lights.
+	virtual bool		PrepareForLighting();
+
+	virtual void		AddLightToFace( 
+		IncrementalLightID lightID, 
+		int iFace, 
+		int iSample,
+		int lmSize,
+		float dot,
+		int iThread );
+
+	virtual void		FinishFace(
+		IncrementalLightID lightID,
+		int iFace,
+		int iThread );
+
+	// For each face that was changed during the lighting process, save out
+	// new data for it in the incremental file.
+	virtual bool		Finalize();
+
+	virtual void		GetFacesTouched( CUtlVector<unsigned char> &touched );
+
+	virtual bool		Serialize();
+
+
+private:
+
+	// Read/write the header from the file.
+	bool				ReadIncrementalHeader( long fp, CIncrementalHeader *pHeader );
+	bool				WriteIncrementalHeader( long fp );
+
+	// Returns true if the incremental file is valid and we can use InitUpdate.
+	bool				IsIncrementalFileValid();
+	
+	void				Term();
+
+	// For each light in 'activelights', add a light to m_Lights and link them together.
+	void				AddLightsForActiveLights();
+
+	// Load and save the state.
+	bool				LoadIncrementalFile();
+	bool				SaveIncrementalFile();
+
+	typedef CUtlVector<CLightFace*> CFaceLightList;
+	void				LinkLightsToFaces( CUtlVector<CFaceLightList> &faceLights );
+
+
+private:
+
+	char const		*m_pIncrementalFilename;
+	char const		*m_pBSPFilename;
+	
+	CUtlLinkedList<CIncLight*, IncrementalLightID>	
+					m_Lights;
+
+	// The face index is set to 1 if a face has new lighting data applied to it.
+	// This is used to optimize the set of lightmaps we recomposite.
+	CUtlVector<unsigned char>	m_FacesTouched;
+	
+	int				m_TotalMemory;
+
+	// Set to true when one or more runs were completed successfully.
+	bool			m_bSuccessfulRun;
+};
+
+
+
+#endif // INCREMENTAL_H