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diff --git a/indra/newview/llworld.h b/indra/newview/llworld.h
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+/** 
+ * @file llworld.h
+ * @brief Initial test structure to organize viewer regions
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLWORLD_H
+#define LL_LLWORLD_H
+
+#include "llpatchvertexarray.h"
+#include "doublelinkedlist.h"
+#include "linked_lists.h"
+
+#include "llmath.h"
+//#include "vmath.h"
+#include "v3math.h"
+#include "llmemory.h"
+#include "llstring.h"
+#include "llviewerpartsim.h"
+#include "llviewerimage.h"
+
+class LLViewerRegion;
+class LLVector3d;
+class LLMessageSystem;
+class LLNetMap;
+class LLHost;
+
+class LLViewerObject;
+class LLVOWater;
+class LLSurfacePatch;
+
+class LLCloudPuff;
+class LLCloudGroup;
+class LLVOAvatar;
+
+// LLWorld maintains a stack of unused viewer_regions and an array of pointers to viewer regions
+// as simulators are connected to, viewer_regions are popped off the stack and connected as required
+// as simulators are removed, they are pushed back onto the stack
+
+class LLWorld
+{
+public:
+	LLWorld(const U32 grids_per_region, const F32 meters_per_grid);
+	~LLWorld();
+
+	LLViewerRegion*	addRegion(const U64 &region_handle, const LLHost &host);
+		// safe to call if already present, does the "right thing" if
+		// hosts are same, or if hosts are different, etc...
+	void			removeRegion(const LLHost &host);
+
+	void	disconnectRegions(); // Send quit messages to all child regions
+
+	LLViewerRegion*			getRegion(const LLHost &host);
+	LLViewerRegion*			getRegionFromPosGlobal(const LLVector3d &pos);
+	LLViewerRegion*			getRegionFromPosAgent(const LLVector3 &pos);
+	LLViewerRegion*			getRegionFromHandle(const U64 &handle);
+	BOOL					positionRegionValidGlobal(const LLVector3d& pos);			// true if position is in valid region
+	LLVector3d				clipToVisibleRegions(const LLVector3d &start_pos, const LLVector3d &end_pos);
+
+	void					updateAgentOffset(const LLVector3d &offset);
+
+	// All of these should be in the agent coordinate frame
+	LLViewerRegion*			resolveRegionGlobal(LLVector3 &localpos, const LLVector3d &position);
+	LLViewerRegion*			resolveRegionAgent(LLVector3 &localpos, const LLVector3 &position);
+	F32						resolveLandHeightGlobal(const LLVector3d &position);
+	F32						resolveLandHeightAgent(const LLVector3 &position);
+
+	// Return the lowest allowed Z point to prevent objects from being moved
+	// underground.
+	F32 getMinAllowedZ(LLViewerObject* object);
+
+	// takes a line segment defined by point_a and point_b, then
+	// determines the closest (to point_a) point of intersection that is
+	// on the land surface or on an object of the world.
+	// Stores results in "intersection" and "intersection_normal" and
+	// returns a scalar value that is the normalized (by length of line segment) 
+	// distance along the line from "point_a" to "intersection".
+	//
+	// Currently assumes point_a and point_b only differ in z-direction,
+	// but it may eventually become more general.
+	F32 resolveStepHeightGlobal(const LLVOAvatar* avatarp, const LLVector3d &point_a, const LLVector3d &point_b,
+							LLVector3d &intersection, LLVector3 &intersection_normal,
+							LLViewerObject** viewerObjectPtr=NULL);
+
+	LLSurfacePatch *		resolveLandPatchGlobal(const LLVector3d &position);
+	LLVector3				resolveLandNormalGlobal(const LLVector3d &position);		// absolute frame
+
+	U32						getRegionWidthInPoints() const	{ return mWidth; }
+	F32						getRegionScale() const			{ return mScale; }
+
+	// region X and Y size in meters
+	F32						getRegionWidthInMeters() const	{ return mWidthInMeters; }
+	F32						getRegionMinHeight() const		{ return -mWidthInMeters; }
+	F32						getRegionMaxHeight() const		{ return 3.f*mWidthInMeters; }
+
+	void					updateRegions();
+	void					updateVisibilities();
+	void					updateParticles();
+	void					updateClouds(const F32 dt);
+	LLCloudGroup *			findCloudGroup(const LLCloudPuff &puff);
+
+	void					renderPropertyLines();
+
+	void resetStats();
+	void updateNetStats(); // Update network statistics for all the regions...
+
+	void printPacketsLost();
+	void requestCacheMisses();
+
+	// deal with map object updates in the world.
+	static void processCoarseUpdate(LLMessageSystem* msg, void** user_data);
+
+	F32 getLandFarClip() const;
+	void setLandFarClip(const F32 far_clip);
+
+	LLViewerImage *getDefaultWaterTexture();
+	void updateWaterObjects();
+
+	void setSpaceTimeUSec(const U64 space_time_usec);
+	U64 getSpaceTimeUSec() const;
+
+	LLString getInfoString();
+public:
+	LLDoubleLinkedList<LLViewerRegion>	mActiveRegionList;
+	LLViewerPartSim mPartSim;
+
+private:
+	LLLinkedList<LLViewerRegion>		mRegionList;
+	LLDoubleLinkedList<LLViewerRegion>	mVisibleRegionList;
+	LLDoubleLinkedList<LLViewerRegion>	mCulledRegionList;
+
+	// Number of points on edge
+	const U32 mWidth;
+
+	// meters/point, therefore mWidth * mScale = meters per edge
+	const F32 mScale;
+
+	const F32 mWidthInMeters;
+
+	F32 mLandFarClip;					// Far clip distance for land.
+	F32 mIdleUpdateTime;
+	LLPatchVertexArray		mLandPatch;
+	S32 mLastPacketsIn;
+	S32 mLastPacketsOut;
+	S32 mLastPacketsLost;
+
+	////////////////////////////
+	//
+	// Data for "Fake" objects
+	//
+
+	// Used to define the "Square" which we need to fill in
+	U32 mMinRegionX;
+	U32 mMaxRegionX;
+	U32 mMinRegionY;
+	U32 mMaxRegionY;
+
+	LLLinkedList<LLVOWater> mHoleWaterObjects;
+	LLPointer<LLVOWater> mEdgeWaterObjects[8];
+
+	LLPointer<LLViewerImage> mDefaultWaterTexturep;
+	U64 mSpaceTimeUSec;
+};
+
+extern LLWorld *gWorldp;
+#define gWorldPointer gWorldp
+
+void process_enable_simulator(LLMessageSystem *mesgsys, void **user_data);
+void process_disable_simulator(LLMessageSystem *mesgsys, void **user_data);
+
+void process_region_handshake(LLMessageSystem* msg, void** user_data);
+
+void send_agent_pause();
+void send_agent_resume();
+
+#endif