* Send an avatar update to other clients when an avatar rotates, as well as when it moves

* This should fix a long standing issue where you often wouldn't see other people simply turn around without moving at all
* Arguably lastPhysRot (to mirror lastPhysPos) is not a good name, may change variable names later

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -2339,7 +2339,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         }
 
         /// <summary>
-        ///
+        /// Send a terse positional/rotation/velocity update about an avatar to the client.  This avatar can be that of
+        /// the client itself. 
         /// </summary>
         /// <param name="regionHandle"></param>
         /// <param name="timeDilation"></param>
@@ -2352,6 +2353,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             if (rotation.X == rotation.Y && rotation.Y == rotation.Z && rotation.Z == rotation.W && rotation.W == 0)
                 rotation = Quaternion.Identity;          
 
+            //m_log.DebugFormat("[CLIENT]: Sending rotation {0} for {1} to {2}", rotation, localID, Name);
+            
             ImprovedTerseObjectUpdatePacket.ObjectDataBlock terseBlock =
                 CreateAvatarImprovedBlock(localID, position, velocity, rotation);
             ImprovedTerseObjectUpdatePacket terse = (ImprovedTerseObjectUpdatePacket)PacketPool.Instance.GetPacket(PacketType.ImprovedTerseObjectUpdate);

OpenSim/Region/Environment/Scenes/ScenePresence.cs

@@ -142,8 +142,17 @@ namespace OpenSim.Region.Environment.Scenes
         protected ulong crossingFromRegion = 0;
 
         private readonly Vector3[] Dir_Vectors = new Vector3[6];
+        
+        /// <value>
+        /// The avatar position last sent to clients
+        /// </value>
         private Vector3 lastPhysPos = Vector3.Zero;
         
+        /// <value>
+        /// The avatar body rotation last sent to clients 
+        /// </value>
+        private Quaternion lastPhysRot = Quaternion.Identity;
+
         // Position of agent's camera in world (region cordinates)
         protected Vector3 m_CameraCenter = Vector3.Zero;
 
@@ -1581,7 +1590,9 @@ namespace OpenSim.Region.Environment.Scenes
                         m_updateCount = 0;
                     }
                 }
-                else if ((Util.GetDistanceTo(lastPhysPos, AbsolutePosition) > 0.02) || (Util.GetDistanceTo(m_lastVelocity, m_velocity) > 0.02)) // physics-related movement
+                else if ((Util.GetDistanceTo(lastPhysPos, AbsolutePosition) > 0.02) 
+                         || (Util.GetDistanceTo(m_lastVelocity, m_velocity) > 0.02)
+                         || lastPhysRot != m_bodyRot)
                 {
                     // Send Terse Update to all clients updates lastPhysPos and m_lastVelocity
                     // doing the above assures us that we know what we sent the clients last
@@ -1628,6 +1639,7 @@ namespace OpenSim.Region.Environment.Scenes
 
             m_lastVelocity = m_velocity;
             lastPhysPos = AbsolutePosition;
+            lastPhysRot = m_bodyRot;
 
             m_scene.AddAgentTime(System.Environment.TickCount - m_perfMonMS);
 
@@ -2541,6 +2553,9 @@ namespace OpenSim.Region.Environment.Scenes
                     (float)info.GetValue("lastPhysPos.Y", typeof(float)),
                     (float)info.GetValue("lastPhysPos.Z", typeof(float)));
             
+            // Possibly we should store lastPhysRot.  But there may well be not much point since rotation changes
+            // wouldn't carry us across borders anyway
+                                 
             m_CameraCenter
                 = new Vector3(
                     (float)info.GetValue("m_CameraCenter.X", typeof(float)),
@@ -2688,6 +2703,9 @@ namespace OpenSim.Region.Environment.Scenes
             info.AddValue("lastPhysPos.Y", lastPhysPos.Y);
             info.AddValue("lastPhysPos.Z", lastPhysPos.Z);     
             
+            // Possibly we should retrieve lastPhysRot.  But there may well be not much point since rotation changes
+            // wouldn't carry us across borders anyway            
+
             // Vector3
             info.AddValue("m_CameraCenter.X", m_CameraCenter.X);
             info.AddValue("m_CameraCenter.Y", m_CameraCenter.Y);