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diff --git a/OpenSim/Region/PhysicsModules/SharedBase/PhysicsJoint.cs b/OpenSim/Region/PhysicsModules/SharedBase/PhysicsJoint.cs
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+++ b/OpenSim/Region/PhysicsModules/SharedBase/PhysicsJoint.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using OpenSim.Framework;
+using OpenMetaverse;
+
+namespace OpenSim.Region.PhysicsModules.SharedBase
+{
+    public enum PhysicsJointType : int
+    {
+        Ball = 0,
+        Hinge = 1
+    }
+
+    public class PhysicsJoint
+    {
+        public virtual bool IsInPhysicsEngine { get { return false; } } // set internally to indicate if this joint has already been passed to the physics engine or is still pending
+        public PhysicsJointType Type;
+        public string RawParams;
+        public List<string> BodyNames = new List<string>();
+        public Vector3 Position; // global coords
+        public Quaternion Rotation; // global coords
+        public string ObjectNameInScene; // proxy object in scene that represents the joint position/orientation
+        public string TrackedBodyName; // body name that this joint is attached to (ObjectNameInScene will follow TrackedBodyName)
+        public Quaternion LocalRotation; // joint orientation relative to one of the involved bodies, the tracked body
+        public int ErrorMessageCount; // total # of error messages printed for this joint since its creation. if too many, further error messages are suppressed to prevent flooding.
+        public const int maxErrorMessages = 100; // no more than this # of error messages will be printed for each joint
+    }
+}