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diff --git a/linden/indra/llmath/llsphere.h b/linden/indra/llmath/llsphere.h
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+// llsphere.h
+/**
+ * @file llsphere.cpp
+ * @author Andrew Meadows
+ * @brief Simple sphere implementation for basic geometric operations
+ *
+ * $LicenseInfo:firstyear=2001&license=internal$
+ * 
+ * Copyright (c) 2001-2008, Linden Research, Inc.
+ * 
+ * The following source code is PROPRIETARY AND CONFIDENTIAL. Use of
+ * this source code is governed by the Linden Lab Source Code Disclosure
+ * Agreement ("Agreement") previously entered between you and Linden
+ * Lab. By accessing, using, copying, modifying or distributing this
+ * software, you acknowledge that you have been informed of your
+ * obligations under the Agreement 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.
+ * $/LicenseInfo$
+ */
+
+#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