diff -Nur opensim-/OpenSim/Region/Framework/Scenes/Scene.cs opensim/OpenSim/Region/Framework/Scenes/Scene.cs
--- opensim-/OpenSim/Region/Framework/Scenes/Scene.cs	2010-04-17 13:39:39.000000000 +0900
+++ opensim/OpenSim/Region/Framework/Scenes/Scene.cs	2010-04-17 13:48:43.000000000 +0900
@@ -684,7 +684,9 @@
                 + " PhysPrim:" + m_physicalPrim.ToString();
             */
 
-            m_simulatorVersion = simulatorVersion + " (" + Util.GetRuntimeInformation() + ")";
+			// by Fumi.Iseki
+            //m_simulatorVersion = simulatorVersion + " (" + Util.GetRuntimeInformation() + ")";
+            m_simulatorVersion = simulatorVersion;
 
             try
             {
diff -Nur opensim-/OpenSim/Region/Physics/Manager/PhysicsScene.cs opensim/OpenSim/Region/Physics/Manager/PhysicsScene.cs
--- opensim-/OpenSim/Region/Physics/Manager/PhysicsScene.cs	2010-04-17 13:39:39.000000000 +0900
+++ opensim/OpenSim/Region/Physics/Manager/PhysicsScene.cs	2010-04-17 13:48:43.000000000 +0900
@@ -172,16 +172,30 @@
             return false;
         }
 
+
+        // Fumi.Iseki
+        // public Vector2 WorldExtents;
+        private Vector2 worldExtents = new Vector2((int)Constants.RegionSize, (int)Constants.RegionSize);
+
+        public virtual Vector2 getWorldExtents
+        {
+            get { return worldExtents; }
+        }
+
         public virtual void Combine(PhysicsScene pScene, Vector3 offset, Vector3 extents)
         {
+            // Fumi.Iseki
+            worldExtents = new Vector2(extents.X, extents.Y);
             return;
         }
 
         public virtual void UnCombine(PhysicsScene pScene)
         {
-            
+            // Fumi.Iseki
+            worldExtents = new Vector2((int)Constants.RegionSize, (int)Constants.RegionSize);
         }
 
+
         /// <summary>
         /// Queue a raycast against the physics scene.
         /// The provided callback method will be called when the raycast is complete
diff -Nur opensim-/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs opensim/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
--- opensim-/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs	2010-04-17 13:39:39.000000000 +0900
+++ opensim/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs	2010-04-17 13:48:43.000000000 +0900
@@ -1588,6 +1588,14 @@
 
         #endregion
 
+
+        // Fumi.Iseki for called form OpenSim/Region/Framework/Scenes/ScenePresence
+        public override Vector2 getWorldExtents
+        {
+            get { return WorldExtents;}
+        }
+        
+
         public override void Combine(PhysicsScene pScene, Vector3 offset, Vector3 extents)
         {
             m_worldOffset = offset;
@@ -1616,7 +1624,7 @@
 
 
                         if ((int)x > WorldExtents.X || (int)y > WorldExtents.Y ||
-                            (int)x < 0.001f || (int)y < 0.001f)
+                            (int)x < 0 || (int)y < 0)
                             return 0;
 
                         x = x - offsetX;
@@ -3036,6 +3044,37 @@
                             if (actor.bad)
                                 m_log.WarnFormat("[PHYSICS]: BAD Actor {0} in _characters list was not removed?", actor.m_uuid);
                             actor.UpdatePositionAndVelocity();
+
+                            // by Fumi.Iseki  for falling at SIM boundary
+                            d.Vector3 vec = d.BodyGetPosition(actor.Body);
+
+                            if ((vec.Y<0.0f || vec.Y>=WorldExtents.Y || vec.X<0.0f || vec.X>=WorldExtents.X) && !actor.IsColliding && !actor.CollidingGround) {
+                                if      (vec.Y<0.0f) { vec.Y = 0.1f;}
+                                else if (vec.Y>=WorldExtents.Y) { vec.Y = WorldExtents.Y-0.1f;}
+                                if      (vec.X<0.0f) { vec.X = 0.1f;}
+                                else if (vec.X>=WorldExtents.X) { vec.X = WorldExtents.X-0.1f;}
+                                
+                                float height = GetTerrainHeightAtXY(vec.X, vec.Y);
+                                //m_log.ErrorFormat("=============== ({0}, {1}, {2}) => {3}", vec.X, vec.Y, vec.Z, height);
+                                if (actor.Flying) {
+                                    if (vec.Z  <  height + minimumGroundFlightOffset) {
+                                        vec.Z = height + actor.Size.Z/2;
+                                        //actor.Velocity.Z  = 0.0f;
+                                        actor.IsColliding = true;
+                                    }
+                                }
+                                else {
+                                    if (vec.Z < height + actor.Size.Z) {
+                                        vec.Z = height + actor.Size.Z/2;
+                                        //actor.Velocity.Z  = 0.0f;
+                                        actor.IsColliding = true;
+                                        actor.CollidingGround = true;
+                                    }
+                                }
+
+                                //actor.Position = new PhysicsVector(vec.X, vec.Y, vec.Z);
+                                d.BodySetPosition(actor.Body, vec.X, vec.Y, vec.Z);
+                            }
                         }
                     }
                 }