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diff --git a/indra/llmath/llsphere.h b/indra/llmath/llsphere.h
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+// llsphere.h
+/**
+ * @file llsphere.cpp
+ * @author Andrew Meadows
+ * @brief Simple sphere implementation for basic geometric operations
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, 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
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_SPHERE_H
+#define LL_SPHERE_H
+
+#include "stdtypes.h"
+#include "v3math.h"
+#include <iostream>
+#include <vector>
+
+class LLSphere
+{
+public:
+	LLSphere();
+	LLSphere( const LLVector3& center, F32 radius );
+
+	void set( const LLVector3& center, F32 radius );
+	void setCenter( const LLVector3& center );
+	void setRadius( F32 radius );
+
+	const LLVector3& getCenter() const;
+	F32 getRadius() const;
+
+	// returns TRUE if this sphere completely contains other_sphere
+	BOOL contains(const LLSphere& other_sphere) const;
+
+	// returns TRUE if this sphere overlaps other_sphere
+	BOOL overlaps(const LLSphere& other_sphere) const;
+
+	// returns overlap distance
+	// negative overlap is closest approach
+	F32 getOverlap(const LLSphere& other_sphere) const;
+
+	// removes any spheres that are contained in others
+	static void collapse(std::vector<LLSphere>& sphere_list);
+
+	// returns minimum sphere bounding sphere for a set of spheres
+	static LLSphere getBoundingSphere(const LLSphere& first_sphere, const LLSphere& second_sphere);
+	static LLSphere getBoundingSphere(const std::vector<LLSphere>& sphere_list);
+
+	bool operator==(const LLSphere& rhs) const;
+
+	friend std::ostream& operator<<( std::ostream& output_stream, const LLSphere& line );
+
+protected:
+	LLVector3 mCenter;
+	F32 mRadius;
+};
+
+
+#endif