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diff --git a/indra/newview/llviewerpartsim.h b/indra/newview/llviewerpartsim.h
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+++ b/indra/newview/llviewerpartsim.h
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+/** 
+ * @file llviewerpartsim.h
+ * @brief LLViewerPart class header file
+ *
+ * Copyright (c) 2003-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLVIEWERPARTSIM_H
+#define LL_LLVIEWERPARTSIM_H
+
+#include "lldarrayptr.h"
+#include "llskiplist.h"
+#include "llframetimer.h"
+#include "llmemory.h"
+
+#include "llpartdata.h"
+
+class LLViewerImage;
+class LLViewerPart;
+class LLViewerPartSource;
+class LLViewerRegion;
+class LLViewerImage;
+class LLVOPartGroup;
+
+typedef void (*LLVPCallback)(LLViewerPart &part, const F32 dt);
+
+///////////////////
+//
+// An individual particle
+//
+
+
+class LLViewerPart : public LLPartData
+{
+public:
+	LLViewerPart();
+	~LLViewerPart();
+
+	LLViewerPart &operator=(const LLViewerPart &part);
+	void init(LLViewerPartSource *sourcep, LLViewerImage *imagep, LLVPCallback cb);
+
+
+	U32					mPartID;					// Particle ID used primarily for moving between groups
+	F32					mLastUpdateTime;			// Last time the particle was updated
+
+
+	LLVPCallback		mVPCallback;				// Callback function for more complicated behaviors
+	LLPointer<LLViewerPartSource> mPartSourcep;		// Particle source used for this object
+	
+
+	// Current particle state (possibly used for rendering)
+	LLPointer<LLViewerImage>	mImagep;
+	LLVector3		mPosAgent;
+	LLVector3		mVelocity;
+	LLVector3		mAccel;
+	LLColor4		mColor;
+	LLVector2		mScale;
+
+	static U32		sNextPartID;
+};
+
+
+
+class LLViewerPartGroup
+{
+public:
+	LLViewerPartGroup(const LLVector3 &center,
+					  const F32 box_radius);
+	virtual ~LLViewerPartGroup();
+
+	void cleanup();
+
+	BOOL addPart(LLViewerPart &part);
+	
+	void updateParticles(const F32 dt);
+
+	BOOL posInGroup(const LLVector3 &pos);
+
+	void shift(const LLVector3 &offset);
+
+	LLDynamicArray<LLViewerPart> mParticles;
+
+	const LLVector3 &getCenterAgent() const		{ return mCenterAgent; }
+	S32 getCount() const					{ return mParticles.count(); }
+	LLViewerRegion *getRegion() const		{ return mRegionp; }
+protected:
+	void removePart(const S32 part_num);
+
+protected:
+	LLVector3 mCenterAgent;
+	F32 mBoxRadius;
+	LLVector3 mMinObjPos;
+	LLVector3 mMaxObjPos;
+
+	LLPointer<LLVOPartGroup> mVOPartGroupp;
+	LLViewerRegion *mRegionp;
+};
+
+
+class LLViewerPartSim
+{
+public:
+	LLViewerPartSim();
+	virtual ~LLViewerPartSim();
+
+	void shift(const LLVector3 &offset);
+
+	void updateSimulation();
+
+	void addPartSource(LLViewerPartSource *sourcep);
+
+	void cleanupRegion(LLViewerRegion *regionp);
+
+	BOOL shouldAddPart(); // Just decides whether this particle should be added or not (for particle count capping)
+	void addPart(LLViewerPart &part);
+	void cleanMutedParticles(const LLUUID& task_id);
+
+	friend class LLViewerPartGroup;
+
+	BOOL aboveParticleLimit() const { return sParticleCount > sMaxParticleCount; }
+
+	static void setMaxPartCount(const S32 max_parts)	{ sMaxParticleCount = max_parts; }
+	static S32  getMaxPartCount()						{ return sMaxParticleCount; }
+	static void incPartCount(const S32 count)			{ sParticleCount += count; }
+	static void decPartCount(const S32 count)			{ sParticleCount -= count; }
+	
+protected:
+	LLViewerPartGroup *createViewerPartGroup(const LLVector3 &pos_agent);
+	LLViewerPartGroup *put(LLViewerPart &part);
+
+protected:
+	LLDynamicArray<LLViewerPartGroup *> mViewerPartGroups;
+	LLDynamicArrayPtr<LLPointer<LLViewerPartSource> > mViewerPartSources;
+	LLFrameTimer mSimulationTimer;
+
+	static S32 sMaxParticleCount;
+	static S32 sParticleCount;
+};
+
+#endif // LL_LLVIEWERPARTSIM_H