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diff --git a/indra/newview/llpathfindingnavmeshzone.cpp b/indra/newview/llpathfindingnavmeshzone.cpp
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+++ b/indra/newview/llpathfindingnavmeshzone.cpp
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+/** 
+* @file llpathfindingnavmeshzone.cpp
+* @brief Implementation of llpathfindingnavmeshzone
+* @author Stinson@lindenlab.com
+*
+* $LicenseInfo:firstyear=2012&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2012, Linden Research, Inc.
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+
+
+#include "llviewerprecompiledheaders.h"
+
+#include "llpathfindingnavmeshzone.h"
+
+#include <vector>
+
+#include <boost/bind.hpp>
+#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/signals2.hpp>
+
+#include "llagent.h"
+#include "llpathfindingmanager.h"
+#include "llpathfindingnavmesh.h"
+#include "llpathfindingnavmeshstatus.h"
+#include "llpathinglib.h"
+#include "llsd.h"
+#include "lluuid.h"
+#include "llviewercontrol.h"
+#include "llviewerregion.h"
+
+#define CENTER_REGION 99
+
+//---------------------------------------------------------------------------
+// LLPathfindingNavMeshZone
+//---------------------------------------------------------------------------
+
+LLPathfindingNavMeshZone::LLPathfindingNavMeshZone()
+	: mNavMeshLocationPtrs(),
+	mNavMeshZoneRequestStatus(kNavMeshZoneRequestUnknown),
+	mNavMeshZoneSignal()
+{
+}
+
+LLPathfindingNavMeshZone::~LLPathfindingNavMeshZone()
+{
+}
+
+LLPathfindingNavMeshZone::navmesh_zone_slot_t LLPathfindingNavMeshZone::registerNavMeshZoneListener(navmesh_zone_callback_t pNavMeshZoneCallback)
+{
+	return mNavMeshZoneSignal.connect(pNavMeshZoneCallback);
+}
+
+void LLPathfindingNavMeshZone::initialize()
+{
+	mNavMeshLocationPtrs.clear();
+
+	NavMeshLocationPtr centerNavMeshPtr(new NavMeshLocation(CENTER_REGION, boost::bind(&LLPathfindingNavMeshZone::handleNavMeshLocation, this)));
+	mNavMeshLocationPtrs.push_back(centerNavMeshPtr);
+
+	U32 neighborRegionDir = gSavedSettings.getU32("PathfindingRetrieveNeighboringRegion");
+	if (neighborRegionDir != CENTER_REGION)
+	{
+		NavMeshLocationPtr neighborNavMeshPtr(new NavMeshLocation(neighborRegionDir, boost::bind(&LLPathfindingNavMeshZone::handleNavMeshLocation, this)));
+		mNavMeshLocationPtrs.push_back(neighborNavMeshPtr);
+	}
+}
+
+void LLPathfindingNavMeshZone::enable()
+{
+	for (NavMeshLocationPtrs::iterator navMeshLocationPtrIter = mNavMeshLocationPtrs.begin();
+		navMeshLocationPtrIter != mNavMeshLocationPtrs.end(); ++navMeshLocationPtrIter)
+	{
+		NavMeshLocationPtr navMeshLocationPtr = *navMeshLocationPtrIter;
+		navMeshLocationPtr->enable();
+	}
+}
+
+void LLPathfindingNavMeshZone::disable()
+{
+	for (NavMeshLocationPtrs::iterator navMeshLocationPtrIter = mNavMeshLocationPtrs.begin();
+		navMeshLocationPtrIter != mNavMeshLocationPtrs.end(); ++navMeshLocationPtrIter)
+	{
+		NavMeshLocationPtr navMeshLocationPtr = *navMeshLocationPtrIter;
+		navMeshLocationPtr->disable();
+	}
+}
+
+void LLPathfindingNavMeshZone::refresh()
+{
+	if (LLPathingLib::getInstance() != NULL)
+	{
+		LLPathingLib::getInstance()->cleanupResidual();
+	}
+
+	for (NavMeshLocationPtrs::iterator navMeshLocationPtrIter = mNavMeshLocationPtrs.begin();
+		navMeshLocationPtrIter != mNavMeshLocationPtrs.end(); ++navMeshLocationPtrIter)
+	{
+		NavMeshLocationPtr navMeshLocationPtr = *navMeshLocationPtrIter;
+		navMeshLocationPtr->refresh();
+	}
+}
+
+LLPathfindingNavMeshZone::ENavMeshZoneStatus LLPathfindingNavMeshZone::getNavMeshZoneStatus() const
+{
+	bool hasPending = false;
+	bool hasBuilding = false;
+	bool hasComplete = false;
+	bool hasRepending = false;
+
+	for (NavMeshLocationPtrs::const_iterator navMeshLocationPtrIter = mNavMeshLocationPtrs.begin();
+		navMeshLocationPtrIter != mNavMeshLocationPtrs.end(); ++navMeshLocationPtrIter)
+	{
+		const NavMeshLocationPtr navMeshLocationPtr = *navMeshLocationPtrIter;
+
+		switch (navMeshLocationPtr->getNavMeshStatus())
+		{
+		case LLPathfindingNavMeshStatus::kPending :
+			hasPending = true;
+			break;
+		case LLPathfindingNavMeshStatus::kBuilding :
+			hasBuilding = true;
+			break;
+		case LLPathfindingNavMeshStatus::kComplete :
+			hasComplete = true;
+			break;
+		case LLPathfindingNavMeshStatus::kRepending :
+			hasRepending = true;
+			break;
+		default :
+			hasPending = true;
+			llassert(0);
+			break;
+		}
+	}
+
+	ENavMeshZoneStatus zoneStatus = kNavMeshZoneComplete;
+	if (hasRepending || (hasPending && hasBuilding))
+	{
+		zoneStatus = kNavMeshZonePendingAndBuilding;
+	}
+	else if (hasComplete)
+	{
+		if (hasPending)
+		{
+			zoneStatus = kNavMeshZoneSomePending;
+		}
+		else if (hasBuilding)
+		{
+			zoneStatus = kNavMeshZoneSomeBuilding;
+		}
+		else
+		{
+			zoneStatus = kNavMeshZoneComplete;
+		}
+	}
+	else if (hasPending)
+	{
+		zoneStatus = kNavMeshZonePending;
+	}
+	else if (hasBuilding)
+	{
+		zoneStatus = kNavMeshZoneBuilding;
+	}
+
+	return zoneStatus;
+}
+
+void LLPathfindingNavMeshZone::handleNavMeshLocation()
+{
+	updateStatus();
+}
+
+void LLPathfindingNavMeshZone::updateStatus()
+{
+	bool hasRequestUnknown = false;
+	bool hasRequestWaiting = false;
+	bool hasRequestChecking = false;
+	bool hasRequestNeedsUpdate = false;
+	bool hasRequestStarted = false;
+	bool hasRequestCompleted = false;
+	bool hasRequestNotEnabled = false;
+	bool hasRequestError = false;
+
+	for (NavMeshLocationPtrs::const_iterator navMeshLocationPtrIter = mNavMeshLocationPtrs.begin();
+		navMeshLocationPtrIter != mNavMeshLocationPtrs.end(); ++navMeshLocationPtrIter)
+	{
+		const NavMeshLocationPtr navMeshLocationPtr = *navMeshLocationPtrIter;
+		switch (navMeshLocationPtr->getRequestStatus())
+		{
+		case LLPathfindingNavMesh::kNavMeshRequestUnknown :
+			hasRequestUnknown = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestWaiting :
+			hasRequestWaiting = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestChecking :
+			hasRequestChecking = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestNeedsUpdate :
+			hasRequestNeedsUpdate = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestStarted :
+			hasRequestStarted = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestCompleted :
+			hasRequestCompleted = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestNotEnabled :
+			hasRequestNotEnabled = true;
+			break;
+		case LLPathfindingNavMesh::kNavMeshRequestError :
+			hasRequestError = true;
+			break;
+		default :
+			hasRequestError = true;
+			llassert(0);
+			break;
+		}
+	}
+
+	ENavMeshZoneRequestStatus zoneRequestStatus = kNavMeshZoneRequestUnknown;
+	if (hasRequestWaiting)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestWaiting;
+	}
+	else if (hasRequestNeedsUpdate)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestNeedsUpdate;
+	}
+	else if (hasRequestChecking)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestChecking;
+	}
+	else if (hasRequestStarted)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestStarted;
+	}
+	else if (hasRequestError)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestError;
+	}
+	else if (hasRequestUnknown)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestUnknown;
+	}
+	else if (hasRequestCompleted)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestCompleted;
+	}
+	else if (hasRequestNotEnabled)
+	{
+		zoneRequestStatus = kNavMeshZoneRequestNotEnabled;
+	}
+	else
+	{
+		zoneRequestStatus = kNavMeshZoneRequestError;
+		llassert(0);
+	}
+
+	if ((mNavMeshZoneRequestStatus != kNavMeshZoneRequestCompleted) &&
+		(zoneRequestStatus == kNavMeshZoneRequestCompleted))
+	{
+		llassert(LLPathingLib::getInstance() != NULL);
+		if (LLPathingLib::getInstance() != NULL)
+		{
+			LLPathingLib::getInstance()->processNavMeshData();
+		}
+	}
+
+	mNavMeshZoneRequestStatus = zoneRequestStatus;
+	mNavMeshZoneSignal(mNavMeshZoneRequestStatus);
+}
+
+//---------------------------------------------------------------------------
+// LLPathfindingNavMeshZone::NavMeshLocation
+//---------------------------------------------------------------------------
+
+LLPathfindingNavMeshZone::NavMeshLocation::NavMeshLocation(S32 pDirection, navmesh_location_callback_t pLocationCallback)
+	: mDirection(pDirection),
+	mRegionUUID(),
+	mHasNavMesh(false),
+	mNavMeshVersion(0U),
+	mNavMeshStatus(LLPathfindingNavMeshStatus::kComplete),
+	mLocationCallback(pLocationCallback),
+	mRequestStatus(LLPathfindingNavMesh::kNavMeshRequestUnknown),
+	mNavMeshSlot()
+{
+}
+
+LLPathfindingNavMeshZone::NavMeshLocation::~NavMeshLocation()
+{
+}
+
+void LLPathfindingNavMeshZone::NavMeshLocation::enable()
+{
+	clear();
+
+	LLViewerRegion *region = getRegion();
+	if (region == NULL)
+	{
+		mRegionUUID.setNull();
+	}
+	else
+	{
+		mRegionUUID = region->getRegionID();
+		mNavMeshSlot = LLPathfindingManager::getInstance()->registerNavMeshListenerForRegion(region, boost::bind(&LLPathfindingNavMeshZone::NavMeshLocation::handleNavMesh, this, _1, _2, _3));
+	}
+}
+
+void LLPathfindingNavMeshZone::NavMeshLocation::refresh()
+{
+	LLViewerRegion *region = getRegion();
+
+	if (region == NULL)
+	{
+		llassert(mRegionUUID.isNull());
+		LLPathfindingNavMeshStatus newNavMeshStatus(mRegionUUID);
+		LLSD::Binary nullData;
+		handleNavMesh(LLPathfindingNavMesh::kNavMeshRequestNotEnabled, newNavMeshStatus, nullData);
+	}
+	else
+	{
+		llassert(mRegionUUID == region->getRegionID());
+		LLPathfindingManager::getInstance()->requestGetNavMeshForRegion(region, false);
+	}
+}
+
+void LLPathfindingNavMeshZone::NavMeshLocation::disable()
+{
+	clear();
+}
+
+LLPathfindingNavMesh::ENavMeshRequestStatus LLPathfindingNavMeshZone::NavMeshLocation::getRequestStatus() const
+{
+	return mRequestStatus;
+}
+
+LLPathfindingNavMeshStatus::ENavMeshStatus LLPathfindingNavMeshZone::NavMeshLocation::getNavMeshStatus() const
+{
+	return mNavMeshStatus;
+}
+
+void LLPathfindingNavMeshZone::NavMeshLocation::handleNavMesh(LLPathfindingNavMesh::ENavMeshRequestStatus pNavMeshRequestStatus, const LLPathfindingNavMeshStatus &pNavMeshStatus, const LLSD::Binary &pNavMeshData)
+{
+	llassert(mRegionUUID == pNavMeshStatus.getRegionUUID());
+
+	if ((pNavMeshRequestStatus == LLPathfindingNavMesh::kNavMeshRequestCompleted) &&
+		(!mHasNavMesh || (mNavMeshVersion != pNavMeshStatus.getVersion())))
+	{
+		llassert(!pNavMeshData.empty());
+		mHasNavMesh = true;
+		mNavMeshVersion = pNavMeshStatus.getVersion();
+		llassert(LLPathingLib::getInstance() != NULL);
+		if (LLPathingLib::getInstance() != NULL)
+		{
+			LLPathingLib::getInstance()->extractNavMeshSrcFromLLSD(pNavMeshData, mDirection);
+		}
+	}
+
+	mRequestStatus = pNavMeshRequestStatus;
+	mNavMeshStatus = pNavMeshStatus.getStatus();
+	mLocationCallback();
+}
+
+void LLPathfindingNavMeshZone::NavMeshLocation::clear()
+{
+	mHasNavMesh = false;
+	mRequestStatus = LLPathfindingNavMesh::kNavMeshRequestUnknown;
+	mNavMeshStatus = LLPathfindingNavMeshStatus::kComplete;
+	if (mNavMeshSlot.connected())
+	{
+		mNavMeshSlot.disconnect();
+	}
+}
+
+LLViewerRegion *LLPathfindingNavMeshZone::NavMeshLocation::getRegion() const
+{
+	LLViewerRegion *region = NULL;
+
+	LLViewerRegion *currentRegion = gAgent.getRegion();
+	if (currentRegion != NULL)
+	{
+		if (mDirection == CENTER_REGION)
+		{
+			region = currentRegion;
+		}
+		else
+		{
+			//User wants to pull in a neighboring region
+			std::vector<S32> availableRegions;
+			currentRegion->getNeighboringRegionsStatus( availableRegions );
+			//Is the desired region in the available list
+			std::vector<S32>::iterator foundElem = std::find(availableRegions.begin(),availableRegions.end(),mDirection); 
+			if ( foundElem != availableRegions.end() )
+			{
+				std::vector<LLViewerRegion*> neighborRegionsPtrs;
+				currentRegion->getNeighboringRegions( neighborRegionsPtrs );
+				region = neighborRegionsPtrs[foundElem - availableRegions.begin()];
+			}
+		}
+	}
+
+	return region;
+}