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diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSActors.cs b/OpenSim/Region/Physics/BulletSPlugin/BSActors.cs
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+++ b/OpenSim/Region/Physics/BulletSPlugin/BSActors.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 copyrightD
+ *       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 System.Text;
+
+namespace OpenSim.Region.Physics.BulletSPlugin
+{
+public class BSActorCollection
+{
+    private BSScene m_physicsScene { get; set; }
+    private Dictionary<string, BSActor> m_actors;
+
+    public BSActorCollection(BSScene physicsScene)
+    {
+        m_physicsScene = physicsScene;
+        m_actors = new Dictionary<string, BSActor>();
+    }
+    public void Add(string name, BSActor actor)
+    {
+        lock (m_actors)
+        {
+            if (!m_actors.ContainsKey(name))
+            {
+                m_actors[name] = actor;
+            }
+        }
+    }
+    public bool RemoveAndRelease(string name)
+    {
+        bool ret = false;
+        lock (m_actors)
+        {
+            if (m_actors.ContainsKey(name))
+            {
+                BSActor beingRemoved = m_actors[name];
+                m_actors.Remove(name);
+                beingRemoved.Dispose();
+                ret = true;
+            }
+        }
+        return ret;
+    }
+    public void Clear()
+    {
+        lock (m_actors)
+        {
+            Release();
+            m_actors.Clear();
+        }
+    }
+    public void Dispose()
+    {
+        Clear();
+    }
+    public bool HasActor(string name)
+    {
+        return m_actors.ContainsKey(name);
+    }
+    public bool TryGetActor(string actorName, out BSActor theActor)
+    {
+        return m_actors.TryGetValue(actorName, out theActor);
+    }
+    public void ForEachActor(Action<BSActor> act)
+    {
+        lock (m_actors)
+        {
+            foreach (KeyValuePair<string, BSActor> kvp in m_actors)
+                act(kvp.Value);
+        }
+    }
+
+    public void Enable(bool enabl)
+    {
+        ForEachActor(a => a.SetEnabled(enabl));
+    }
+    public void Release()
+    {
+        ForEachActor(a => a.Dispose());
+    }
+    public void Refresh()
+    {
+        ForEachActor(a => a.Refresh());
+    }
+    public void RemoveDependencies()
+    {
+        ForEachActor(a => a.RemoveDependencies());
+    }
+}
+
+// =============================================================================
+/// <summary>
+/// Each physical object can have 'actors' who are pushing the object around.
+/// This can be used for hover, locking axis, making vehicles, etc.
+/// Each physical object can have multiple actors acting on it.
+///
+/// An actor usually registers itself with physics scene events (pre-step action)
+/// and modifies the parameters on the host physical object.
+/// </summary>
+public abstract class BSActor
+{
+    protected BSScene m_physicsScene { get; private set; }
+    protected BSPhysObject m_controllingPrim { get; private set; }
+    public virtual bool Enabled { get; set; }
+    public string ActorName { get; private set; }
+
+    public BSActor(BSScene physicsScene, BSPhysObject pObj, string actorName)
+    {
+        m_physicsScene = physicsScene;
+        m_controllingPrim = pObj;
+        ActorName = actorName;
+        Enabled = true;
+    }
+
+    // Return 'true' if activily updating the prim
+    public virtual bool isActive
+    {
+        get { return Enabled; }
+    }
+
+    // Turn the actor on an off. Only used by ActorCollection to set all enabled/disabled.
+    // Anyone else should assign true/false to 'Enabled'.
+    public void SetEnabled(bool setEnabled)
+    {
+        Enabled = setEnabled;
+    }
+    // Release any connections and resources used by the actor.
+    public abstract void Dispose();
+    // Called when physical parameters (properties set in Bullet) need to be re-applied.
+    public abstract void Refresh();
+    // The object's physical representation is being rebuilt so pick up any physical dependencies (constraints, ...).
+    //     Register a prestep action to restore physical requirements before the next simulation step.
+    public abstract void RemoveDependencies();
+
+}
+}