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diff --git a/linden/indra/newview/head.h b/linden/indra/newview/head.h
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+/** 
+ * @file head.h
+ * @brief Head class definition
+ *
+ * Copyright (c) 2000-2007, 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.
+ */
+
+// description of a class that models the motion of a human head.
+// The physics isn't quite right, but it will suffice for right now.
+
+#ifndef LL_HEAD_H
+#define LL_HEAD_H
+
+//#include <sys/time.h>
+
+class Head {
+  public:
+
+  Head();
+  Head(F32 m, F32 r);
+
+  F32 setMass(F32 m);
+  F32 setRadius(F32 r);
+
+  F32 getMass();
+  F32 getRadius();
+  F32 getInertia();
+
+  void propagate(F32 horizontal_force, F32 vertical_force, F32 dt);
+
+  F32 phi, theta;                    // azimuth and elevation
+  //struct timeval t;
+  //struct timezone tz;
+
+  private:
+  F32 mass, radius, inertia;
+};
+
+#endif
+
+