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diff --git a/linden/indra/llmath/llvolumemgr.h b/linden/indra/llmath/llvolumemgr.h
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+/** 
+ * @file llvolumemgr.h
+ * @brief LLVolumeMgr class.
+ *
+ * Copyright (c) 2002-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLVOLUMEMGR_H
+#define LL_LLVOLUMEMGR_H
+
+#include <map>
+
+#include "llvolume.h"
+#include "llmemory.h"
+#include "llthread.h"
+
+class LLVolumeParams;
+class LLVolumeLODGroup;
+
+class LLVolumeLODGroup : public LLThreadSafeRefCount
+{
+protected:
+        ~LLVolumeLODGroup();
+        
+public:
+        enum
+        {
+                NUM_LODS = 4
+        };
+
+        LLVolumeLODGroup(const LLVolumeParams &params);
+
+        BOOL derefLOD(LLVolume *volumep);
+        static S32 getDetailFromTan(const F32 tan_angle);
+        static F32 getVolumeScaleFromDetail(const S32 detail);
+
+        LLVolume *getLOD(const S32 detail);
+        const LLVolumeParams &getParams() const { return mParams; };
+
+        F32     dump();
+        friend std::ostream& operator<<(std::ostream& s, const LLVolumeLODGroup& volgroup);
+
+protected:
+        LLVolumeParams mParams;
+
+        S32 mLODRefs[NUM_LODS];
+        LLVolume *mVolumeLODs[NUM_LODS];
+        static F32 mDetailThresholds[NUM_LODS];
+        static F32 mDetailScales[NUM_LODS];
+        S32             mAccessCount[NUM_LODS];
+};
+
+class LLVolumeMgr
+{
+public:
+        static void initClass();
+        static BOOL cleanupClass();
+        
+public:
+        LLVolumeMgr();
+        ~LLVolumeMgr();
+        BOOL cleanup();                 // Cleanup all volumes being managed, returns TRUE if no dangling references
+        LLVolume *getVolume(const LLVolumeParams &volume_params, const S32 detail);
+        void cleanupVolume(LLVolume *volumep);
+
+        void dump();
+        friend std::ostream& operator<<(std::ostream& s, const LLVolumeMgr& volume_mgr);
+
+protected:
+        typedef std::map<const LLVolumeParams*, LLVolumeLODGroup*, LLVolumeParams::compare> volume_lod_group_map_t;
+        typedef volume_lod_group_map_t::const_iterator volume_lod_group_map_iter;
+        volume_lod_group_map_t mVolumeLODGroups;
+
+        LLMutex* mDataMutex;
+        
+//      S32 mNumVolumes;
+};
+
+extern LLVolumeMgr* gVolumeMgr;
+
+#endif // LL_LLVOLUMEMGR_H