diff --git a/OpenSim/Framework/AvatarAppearance.cs b/OpenSim/Framework/AvatarAppearance.cs
index b01b8da5fb..2183fb6c8a 100644
--- a/OpenSim/Framework/AvatarAppearance.cs
+++ b/OpenSim/Framework/AvatarAppearance.cs
@@ -40,10 +40,12 @@ namespace OpenSim.Framework
     /// </summary>
     public class AvatarAppearance
     {
+        // SL box diferent to size
         const float AVBOXAJUST = 0.2f;
+        // constrains  for ubitode physics
         const float AVBOXMINX = 0.2f;
         const float AVBOXMINY = 0.3f;
-        const float AVBOXMINZ = 0.5f;
+        const float AVBOXMINZ = 1.2f;
 
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
@@ -60,7 +62,7 @@ namespace OpenSim.Framework
         protected AvatarWearable[] m_wearables;
         protected Dictionary<int, List<AvatarAttachment>> m_attachments;
         protected float m_avatarHeight = 0;
-        protected Vector3 m_avatarSize = new Vector3(0.45f, 0.6f, 1.9f);
+        protected Vector3 m_avatarSize = new Vector3(0.45f, 0.6f, 1.9f); // sl Z cloud value
         protected Vector3 m_avatarBoxSize = new Vector3(0.45f, 0.6f, 1.9f);
         protected float m_avatarFeetOffset = 0;
         protected float m_avatarAnimOffset = 0;
@@ -157,6 +159,8 @@ namespace OpenSim.Framework
                 SetDefaultParams();
 
 //            SetHeight();
+            if(m_avatarHeight == 0)
+                SetSize(new Vector3(0.45f,0.6f,1.9f));
 
             m_attachments = new Dictionary<int, List<AvatarAttachment>>();
         }
@@ -408,6 +412,20 @@ namespace OpenSim.Framework
 
         public void SetSize(Vector3 avSize)
         {
+            if (avSize.X > 32f)
+                avSize.X = 32f;
+            else if (avSize.X < 0.1f)
+                avSize.X = 0.1f;
+
+            if (avSize.Y > 32f)
+                avSize.Y = 32f;
+            else if (avSize.Y < 0.1f)
+                avSize.Y = 0.1f;
+            if (avSize.Z > 32f)
+                avSize.Z = 32f;
+            else if (avSize.Z < 0.1f)
+                avSize.Z = 0.1f;
+
             m_avatarSize = avSize;
             m_avatarBoxSize = avSize;
             m_avatarBoxSize.Z += AVBOXAJUST;
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 9dfccca445..9ada5bb24e 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -3443,8 +3443,9 @@ namespace OpenSim.Region.Framework.Scenes
                     Name, Scene.RegionInfo.RegionName);
             }
 
-//            if (Appearance.AvatarHeight == 0)
+            if (Appearance.AvatarHeight == 0)
 //                Appearance.SetHeight();
+                Appearance.SetSize(new Vector3(0.45f,0.6f,1.9f));
 
             PhysicsScene scene = m_scene.PhysicsScene;
 
diff --git a/OpenSim/Services/Interfaces/IAvatarService.cs b/OpenSim/Services/Interfaces/IAvatarService.cs
index 260e1c64ca..c0130f139b 100644
--- a/OpenSim/Services/Interfaces/IAvatarService.cs
+++ b/OpenSim/Services/Interfaces/IAvatarService.cs
@@ -201,8 +201,13 @@ namespace OpenSim.Services.Interfaces
                     appearance.Serial = Int32.Parse(Data["Serial"]);
 
                 if (Data.ContainsKey("AvatarHeight"))
-                    appearance.SetSize(new Vector3(0.45f, 0.6f, float.Parse(Data["AvatarHeight"])));
+                {
+                    float h = float.Parse(Data["AvatarHeight"]);
+                    if( h == 0f)
+                        h = 1.9f;
+                    appearance.SetSize(new Vector3(0.45f, 0.6f, h ));
 //                    appearance.AvatarHeight = float.Parse(Data["AvatarHeight"]);
+                }
 
                 // Legacy Wearables
                 if (Data.ContainsKey("BodyItem"))