Fix issue with BulletSim avatar level flight jitter by commenting out RawVelocity update threshold for now in BSCharacter.UpdateProperties().

For some reason as yet unidentified (feedback?) a threshold above 0.4 here causes the RawVelocity to move between a lower and upper bound rather than remaining constant.
The RawVelocity increased until it triggered the threshold update, at which point it started to decrease until it again triggered the threshhold update.
This delta-v was enough to exceed the checks in ScenePresence.SendTerseUpdateToAllClients() and produce jittery avatar flight because of the fluctuating velocity.
With a threshold of 0.4 (or 0, as with ODE), the RawVelocity remains constant in BulletSim and so avatar flight becomes mostly smooth - remaining occasional glitches appear to be a result of errors in distance extraploation.
There are no obvious problems with commenting out the threshold.
Misterblue, if this is wrong or I've missed some subtlety here, please feel free to revert and/or correct.
The same considerations may or may not apply to object velocity updates.

BUILDING.md

@@ -19,10 +19,14 @@ Prereqs:
 
 From the distribution type:
  * ./runprebuild.sh
- * nant (or xbuild)
+ * nant (or !* xbuild)
  * cd bin 
  * copy OpenSim.ini.example to OpenSim.ini and other appropriate files in bin/config-include
  * run mono OpenSim.exe
+ !* xbuild option switches
+ !*          clean:  xbuild /target:clean
+ !*          debug: (default) xbuild /property:Configuration=Debug
+ !*          release: xbuild /property:Configuration=Release
 
 # Using Monodevelop
 

OpenSim/Addons/Groups/Remote/GroupsServiceRobustConnector.cs

@@ -109,7 +109,7 @@ namespace OpenSim.Groups
                 string method = request["METHOD"].ToString();
                 request.Remove("METHOD");
 
-                m_log.DebugFormat("[Groups.Handler]: {0}", method);
+//                m_log.DebugFormat("[Groups.Handler]: {0}", method);
                 switch (method)
                 {
                     case "PUTGROUP":

OpenSim/Framework/Communications/RestClient.cs

@@ -296,6 +296,14 @@ namespace OpenSim.Framework.Communications
 
         #endregion Async communications with server
 
+        /// <summary>
+        /// Perform a synchronous request
+        /// </summary>
+        public Stream Request()
+        {
+            return Request(null);
+        }
+
         /// <summary>
         /// Perform a synchronous request
         /// </summary>

OpenSim/Framework/RegionInfo.cs

@@ -147,8 +147,29 @@ namespace OpenSim.Framework
         public uint WorldLocX = 0;
         public uint WorldLocY = 0;
         public uint WorldLocZ = 0;
+
+        /// <summary>
+        /// X dimension of the region.
+        /// </summary>
+        /// <remarks>
+        /// If this is a varregion then the default size set here will be replaced when we load the region config.
+        /// </remarks>
         public uint RegionSizeX = Constants.RegionSize;
+
+        /// <summary>
+        /// X dimension of the region.
+        /// </summary>
+        /// <remarks>
+        /// If this is a varregion then the default size set here will be replaced when we load the region config.
+        /// </remarks>
         public uint RegionSizeY = Constants.RegionSize;
+
+        /// <summary>
+        /// Z dimension of the region.
+        /// </summary>
+        /// <remarks>
+        /// XXX: Unknown if this accounts for regions with negative Z.
+        /// </remarks>
         public uint RegionSizeZ = Constants.RegionHeight;
 
         private Dictionary<String, String> m_extraSettings = new Dictionary<string, string>();

OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs

@@ -1578,12 +1578,20 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
 
         private Byte[] GenerateOverlay()
         {
-            using (Bitmap overlay = new Bitmap(256, 256))
+            // These need to be ints for bitmap generation
+            int regionSizeX = (int)m_scene.RegionInfo.RegionSizeX;
+            int regionSizeY = (int)m_scene.RegionInfo.RegionSizeY;
+
+            int landTileSize = LandManagementModule.LandUnit;
+            int regionLandTilesX = regionSizeX / landTileSize;
+            int regionLandTilesY = regionSizeY / landTileSize;
+
+            using (Bitmap overlay = new Bitmap(regionSizeX, regionSizeY))
             {
-                bool[,] saleBitmap = new bool[64, 64];
-                for (int x = 0 ; x < 64 ; x++)
+                bool[,] saleBitmap = new bool[regionLandTilesX, regionLandTilesY];
+                for (int x = 0; x < regionLandTilesX; x++)
                 {
-                    for (int y = 0 ; y < 64 ; y++)
+                    for (int y = 0; y < regionLandTilesY; y++)
                         saleBitmap[x, y] = false;
                 }
 
@@ -1596,8 +1604,7 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
                 using (Graphics g = Graphics.FromImage(overlay))
                 {
                     using (SolidBrush transparent = new SolidBrush(background))
-                        g.FillRectangle(transparent, 0, 0, 256, 256);
-
+                        g.FillRectangle(transparent, 0, 0, regionSizeX, regionSizeY);
 
                     foreach (ILandObject land in parcels)
                     {
@@ -1620,12 +1627,16 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
 
                     using (SolidBrush yellow = new SolidBrush(Color.FromArgb(255, 249, 223, 9)))
                     {
-                        for (int x = 0 ; x < 64 ; x++)
+                        for (int x = 0 ; x < regionLandTilesX ; x++)
                         {
-                            for (int y = 0 ; y < 64 ; y++)
+                            for (int y = 0 ; y < regionLandTilesY ; y++)
                             {
                                 if (saleBitmap[x, y])
-                                    g.FillRectangle(yellow, x * 4, 252 - (y * 4), 4, 4);
+                                    g.FillRectangle(
+                                        yellow, x * landTileSize, 
+                                        regionSizeX - landTileSize - (y * landTileSize), 
+                                        landTileSize, 
+                                        landTileSize);
                             }
                         }
                     }
@@ -1654,4 +1665,4 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
         public uint itemtype;
         public ulong regionhandle;
     }
-}
+}

OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs

@@ -744,7 +744,18 @@ public sealed class BSCharacter : BSPhysObject
         //    and will send agent updates to the clients if velocity changes by more than
         //    0.001m/s. Bullet introduces a lot of jitter in the velocity which causes many
         //    extra updates.
-        if (!entprop.Velocity.ApproxEquals(RawVelocity, 0.1f))
+        //
+        // XXX: Contrary to the above comment, setting an update threshold here above 0.4 actually introduces jitter to 
+        // avatar movement rather than removes it.  The larger the threshold, the bigger the jitter.
+        // This is most noticeable in level flight and can be seen with
+        // the "show updates" option in a viewer.  With an update threshold, the RawVelocity cycles between a lower
+        // bound and an upper bound, where the difference between the two is enough to trigger a large delta v update
+        // and subsequently trigger an update in ScenePresence.SendTerseUpdateToAllClients().  The cause of this cycle (feedback?)
+        // has not yet been identified.
+        //
+        // If there is a threshold below 0.4 or no threshold check at all (as in ODE), then RawVelocity stays constant and extra
+        // updates are not triggered in ScenePresence.SendTerseUpdateToAllClients().
+//        if (!entprop.Velocity.ApproxEquals(RawVelocity, 0.1f))
             RawVelocity = entprop.Velocity;
 
         _acceleration = entprop.Acceleration;