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diff --git a/engine/IOcclusionSystem.h b/engine/IOcclusionSystem.h
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+++ b/engine/IOcclusionSystem.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#ifndef IOCCLUSIONSYSTEM_H
+#define	IOCCLUSIONSYSTEM_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+class Vector;
+class VMatrix;
+struct model_t;
+class VPlane;
+class CUtlBuffer;
+
+
+//-----------------------------------------------------------------------------
+// Occlusion system interface
+//-----------------------------------------------------------------------------
+class IOcclusionSystem
+{
+public:
+	// Activate/deactivate an occluder brush model
+	virtual void ActivateOccluder( int nOccluderIndex, bool bActive ) = 0;
+
+	// Sets the view transform
+	virtual void SetView( const Vector &vecCameraPos, float flFOV, const VMatrix &worldToCamera, 
+		const VMatrix &cameraToProjection, const VPlane &nearClipPlane ) = 0;
+
+	// Test for occlusion (bounds specified in abs space)
+	virtual bool IsOccluded( const Vector &vecAbsMins, const Vector &vecAbsMaxs ) = 0;
+
+	// Sets global occlusion parameters
+	virtual void SetOcclusionParameters( float flMaxOccludeeArea, float flMinOccluderArea ) = 0;
+	virtual float MinOccluderArea() const = 0;
+
+	// Render debugging overlay
+	virtual void DrawDebugOverlays() = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Singleton accessor
+//-----------------------------------------------------------------------------
+IOcclusionSystem *OcclusionSystem();
+
+
+#endif // IOCCLUSIONSYSTEM_H