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diff --git a/engine/ispatialpartitioninternal.h b/engine/ispatialpartitioninternal.h
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+++ b/engine/ispatialpartitioninternal.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Revision: $
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef ISPATIALPARTITIONINTERNAL_H
+#define ISPATIALPARTITIONINTERNAL_H
+
+#include "ispatialpartition.h"
+
+
+//-----------------------------------------------------------------------------
+// These methods of the spatial partition manager are only used in the engine
+//-----------------------------------------------------------------------------
+abstract_class ISpatialPartitionInternal : public ISpatialPartition
+{
+public:
+	// Call this to clear out the spatial partition and to re-initialize
+	// it given a particular world size
+	virtual void Init( const Vector& worldmin, const Vector& worldmax ) = 0;
+
+	virtual void DrawDebugOverlays() = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Method to get at the singleton implementation of the spatial partition mgr
+//-----------------------------------------------------------------------------
+ISpatialPartitionInternal* SpatialPartition();
+
+//-----------------------------------------------------------------------------
+// Create/destroy a custom spatial partition
+//-----------------------------------------------------------------------------
+ISpatialPartition *CreateSpatialPartition( const Vector& worldmin, const Vector& worldmax );
+void DestroySpatialPartition( ISpatialPartition * );
+
+
+//-----------------------------------------------------------------------------
+// Method to get at the singleton implementation of the spatial partition mgr
+//-----------------------------------------------------------------------------
+ISpatialPartitionInternal* SpatialPartitionOld();
+
+//-----------------------------------------------------------------------------
+// Create/destroy a custom spatial partition
+//-----------------------------------------------------------------------------
+ISpatialPartition *CreateSpatialPartitionOld( const Vector& worldmin, const Vector& worldmax );
+void DestroySpatialPartitionOld( ISpatialPartition * );
+
+
+#endif	// ISPATIALPARTITIONINTERNAL_H
+
+
+