Add a position parameter to region crossing of objects. This avoids the

potential bad update that places an object at the opposite side of the
origin sim for a moment before actually crossing it. Especially important in
grids like OSG where lag between sims is high.

OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs

@@ -1704,14 +1704,13 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             // Offset the positions for the new region across the border
             Vector3 oldGroupPosition = grp.RootPart.GroupPosition;
-            grp.RootPart.GroupPosition = pos;
 
             // If we fail to cross the border, then reset the position of the scene object on that border.
             uint x = 0, y = 0;
             Utils.LongToUInts(newRegionHandle, out x, out y);
             GridRegion destination = scene.GridService.GetRegionByPosition(scene.RegionInfo.ScopeID, (int)x, (int)y);
 
-            if (destination == null || !CrossPrimGroupIntoNewRegion(destination, grp, silent))
+            if (destination == null || !CrossPrimGroupIntoNewRegion(destination, pos, grp, silent))
             {
                 m_log.InfoFormat("[ENTITY TRANSFER MODULE] cross region transfer failed for object {0}",grp.UUID);
 
@@ -1741,7 +1740,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// true if the crossing itself was successful, false on failure
         /// FIMXE: we still return true if the crossing object was not successfully deleted from the originating region
         /// </returns>
-        protected bool CrossPrimGroupIntoNewRegion(GridRegion destination, SceneObjectGroup grp, bool silent)
+        protected bool CrossPrimGroupIntoNewRegion(GridRegion destination, Vector3 newPosition, SceneObjectGroup grp, bool silent)
         {
             //m_log.Debug("  >>> CrossPrimGroupIntoNewRegion <<<");
 
@@ -1766,7 +1765,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 //if (m_interregionCommsOut != null)
                 //    successYN = m_interregionCommsOut.SendCreateObject(newRegionHandle, grp, true);
                 if (m_aScene.SimulationService != null)
-                    successYN = m_aScene.SimulationService.CreateObject(destination, grp, true);
+                    successYN = m_aScene.SimulationService.CreateObject(destination, newPosition, grp, true);
 
                 if (successYN)
                 {
@@ -1825,7 +1824,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                     gobj.IsAttachment = false;
                     //gobj.RootPart.LastOwnerID = gobj.GetFromAssetID();
                     m_log.DebugFormat("[ENTITY TRANSFER MODULE]: Sending attachment {0} to region {1}", gobj.UUID, destination.RegionName);
-                    CrossPrimGroupIntoNewRegion(destination, gobj, silent);
+                    CrossPrimGroupIntoNewRegion(destination, Vector3.Zero, gobj, silent);
                 }
             }
 

OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/LocalSimulationConnector.cs

@@ -315,7 +315,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation
          * Object-related communications
          */
 
-        public bool CreateObject(GridRegion destination, ISceneObject sog, bool isLocalCall)
+        public bool CreateObject(GridRegion destination, Vector3 newPosition, ISceneObject sog, bool isLocalCall)
         {
             if (destination == null)
                 return false;
@@ -330,12 +330,12 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation
                         // We need to make a local copy of the object
                         ISceneObject sogClone = sog.CloneForNewScene();
                         sogClone.SetState(sog.GetStateSnapshot(), s);
-                        return s.IncomingCreateObject(sogClone);
+                        return s.IncomingCreateObject(newPosition, sogClone);
                     }
                     else
                     {
                         // Use the object as it came through the wire
-                        return s.IncomingCreateObject(sog);
+                        return s.IncomingCreateObject(newPosition, sog);
                     }
                 }
             }

OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/RemoteSimulationConnector.cs

@@ -282,13 +282,13 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation
          * Object-related communications
          */
 
-        public bool CreateObject(GridRegion destination, ISceneObject sog, bool isLocalCall)
+        public bool CreateObject(GridRegion destination, Vector3 newPosition, ISceneObject sog, bool isLocalCall)
         {
             if (destination == null)
                 return false;
 
             // Try local first
-            if (m_localBackend.CreateObject(destination, sog, isLocalCall))
+            if (m_localBackend.CreateObject(destination, newPosition, sog, isLocalCall))
             {
                 //m_log.Debug("[REST COMMS]: LocalBackEnd SendCreateObject succeeded");
                 return true;
@@ -296,7 +296,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation
 
             // else do the remote thing
             if (!m_localBackend.IsLocalRegion(destination.RegionHandle))
-                return m_remoteConnector.CreateObject(destination, sog, isLocalCall);
+                return m_remoteConnector.CreateObject(destination, newPosition, sog, isLocalCall);
 
             return false;
         }

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -2317,7 +2317,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         /// <param name="sog"></param>
         /// <returns></returns>
-        public bool IncomingCreateObject(ISceneObject sog)
+        public bool IncomingCreateObject(Vector3 newPosition, ISceneObject sog)
         {
             //m_log.DebugFormat(" >>> IncomingCreateObject(sog) <<< {0} deleted? {1} isAttach? {2}", ((SceneObjectGroup)sog).AbsolutePosition,
             //    ((SceneObjectGroup)sog).IsDeleted, ((SceneObjectGroup)sog).RootPart.IsAttachment);
@@ -2333,6 +2333,9 @@ namespace OpenSim.Region.Framework.Scenes
                 return false;
             }
 
+            if (newPosition != Vector3.Zero)
+                newObject.RootPart.GroupPosition = newPosition;
+
             if (!AddSceneObject(newObject))
             {
                 m_log.DebugFormat("[SCENE]: Problem adding scene object {0} in {1} ", sog.UUID, RegionInfo.RegionName);

OpenSim/Region/Framework/Scenes/ScenePresence.cs

@@ -3223,7 +3223,7 @@ namespace OpenSim.Region.Framework.Scenes
                     ((SceneObjectGroup)so).LocalId = 0;
                     ((SceneObjectGroup)so).RootPart.ClearUpdateSchedule();
                     so.SetState(cAgent.AttachmentObjectStates[i++], m_scene);
-                    m_scene.IncomingCreateObject(so);
+                    m_scene.IncomingCreateObject(Vector3.Zero, so);
                 }
             }
         }

OpenSim/Server/Handlers/Simulation/ObjectHandlers.cs

@@ -136,6 +136,8 @@ namespace OpenSim.Server.Handlers.Simulation
             int x = 0, y = 0;
             UUID uuid = UUID.Zero;
             string regionname = string.Empty;
+            Vector3 newPosition = Vector3.Zero;
+
             if (args.ContainsKey("destination_x") && args["destination_x"] != null)
                 Int32.TryParse(args["destination_x"].AsString(), out x);
             if (args.ContainsKey("destination_y") && args["destination_y"] != null)
@@ -144,6 +146,8 @@ namespace OpenSim.Server.Handlers.Simulation
                 UUID.TryParse(args["destination_uuid"].AsString(), out uuid);
             if (args.ContainsKey("destination_name") && args["destination_name"] != null)
                 regionname = args["destination_name"].ToString();
+            if (args.ContainsKey("new_position") && args["new_position"] != null)
+                Vector3.TryParse(args["new_position"], out newPosition);
 
             GridRegion destination = new GridRegion();
             destination.RegionID = uuid;
@@ -199,7 +203,7 @@ namespace OpenSim.Server.Handlers.Simulation
             try
             {
                 // This is the meaning of POST object
-                result = CreateObject(destination, sog);
+                result = CreateObject(destination, newPosition, sog);
             }
             catch (Exception e)
             {
@@ -211,9 +215,9 @@ namespace OpenSim.Server.Handlers.Simulation
         }
 
         // subclasses can override this
-        protected virtual bool CreateObject(GridRegion destination, ISceneObject sog)
+        protected virtual bool CreateObject(GridRegion destination, Vector3 newPosition, ISceneObject sog)
         {
-            return m_SimulationService.CreateObject(destination, sog, false);
+            return m_SimulationService.CreateObject(destination, newPosition, sog, false);
         }
 
         protected virtual void DoObjectPut(Hashtable request, Hashtable responsedata, UUID regionID)

OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs

@@ -408,7 +408,7 @@ namespace OpenSim.Services.Connectors.Simulation
         /// <summary>
         ///
         /// </summary>
-        public bool CreateObject(GridRegion destination, ISceneObject sog, bool isLocalCall)
+        public bool CreateObject(GridRegion destination, Vector3 newPosition, ISceneObject sog, bool isLocalCall)
         {
             // m_log.DebugFormat("[REMOTE SIMULATION CONNECTOR]: CreateObject start");
 
@@ -421,6 +421,7 @@ namespace OpenSim.Services.Connectors.Simulation
                 args["sog"] = OSD.FromString(sog.ToXml2());
                 args["extra"] = OSD.FromString(sog.ExtraToXmlString());
                 args["modified"] = OSD.FromBoolean(sog.HasGroupChanged);
+                args["new_position"] = newPosition.ToString();
 
                 string state = sog.GetStateSnapshot();
                 if (state.Length > 0)

OpenSim/Services/Interfaces/ISimulationService.cs

@@ -98,7 +98,7 @@ namespace OpenSim.Services.Interfaces
         /// <param name="sog"></param>
         /// <param name="isLocalCall"></param>
         /// <returns></returns>
-        bool CreateObject(GridRegion destination, ISceneObject sog, bool isLocalCall);
+        bool CreateObject(GridRegion destination, Vector3 newPosition, ISceneObject sog, bool isLocalCall);
 
         /// <summary>
         /// Create an object from the user's inventory in the destination region.