Thank you kindly, Idb for a patch that solves:

llWind always returns a zero vector. In the attached 
patch the WindModule has been changed slightly to 
make wind data available for llWind 

3 files changed, 63 insertions, 2 deletions

diff --git a/OpenSim/Region/Environment/Interfaces/IWindModule.cs b/OpenSim/Region/Environment/Interfaces/IWindModule.cs
new file mode 100644
index 0000000..63a95d3
--- /dev/null
+++ b/OpenSim/Region/Environment/Interfaces/IWindModule.cs
@@ -0,0 +1,41 @@
+/*

+ * Copyright (c) Contributors, http://opensimulator.org/

+ * See CONTRIBUTORS.TXT for a full list of copyright holders.

+ *

+ * Redistribution and use in source and binary forms, with or without

+ * modification, are permitted provided that the following conditions are met:

+ *     * Redistributions of source code must retain the above copyright

+ *       notice, this list of conditions and the following disclaimer.

+ *     * Redistributions in binary form must reproduce the above copyright

+ *       notice, this list of conditions and the following disclaimer in the

+ *       documentation and/or other materials provided with the distribution.

+ *     * Neither the name of the OpenSim Project nor the

+ *       names of its contributors may be used to endorse or promote products

+ *       derived from this software without specific prior written permission.

+ *

+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY

+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY

+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+ */

+

+using System;

+using OpenSim.Framework;

+using OpenMetaverse;

+

+namespace OpenSim.Region.Environment.Interfaces

+{

+    public interface IWindModule : IRegionModule

+    {

+        Vector2[] WindSpeeds

+        {

+            get;

+        }

+    }

+}

diff --git a/OpenSim/Region/Environment/Modules/World/Wind/WindModule.cs b/OpenSim/Region/Environment/Modules/World/Wind/WindModule.cs
index 3fdb771..52eb6e7 100644
--- a/OpenSim/Region/Environment/Modules/World/Wind/WindModule.cs
+++ b/OpenSim/Region/Environment/Modules/World/Wind/WindModule.cs
@@ -35,7 +35,7 @@ using OpenSim.Region.Environment.Scenes;
 
 namespace OpenSim.Region.Environment.Modules
 {
-    public class WindModule : IRegionModule
+    public class WindModule : IWindModule
     {
 
         private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
@@ -83,6 +83,7 @@ namespace OpenSim.Region.Environment.Modules
             scene.EventManager.OnMakeChildAgent += MakeChildAgent;
             scene.EventManager.OnAvatarEnteringNewParcel += AvatarEnteringParcel;
             scene.EventManager.OnClientClosed += ClientLoggedOut;
+            scene.RegisterModuleInterface<IWindModule>(this);
 
             GenWindPos();
 
@@ -117,6 +118,11 @@ namespace OpenSim.Region.Environment.Modules
             get { return false; }
         }
 
+        public Vector2[] WindSpeeds
+        {
+            get { return windSpeeds; }
+        }
+
         public void WindToClient(IClientAPI client)
         {
                 if (ready)
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 956a500..d410a59 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -953,7 +953,21 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public LSL_Vector llWind(LSL_Vector offset)
         {
             m_host.AddScriptLPS(1);
-            return new LSL_Vector();
+            LSL_Vector wind = new LSL_Vector(0, 0, 0);
+            IWindModule module = World.RequestModuleInterface<IWindModule>();
+            if (module != null && module.WindSpeeds != null)
+            {
+                Vector3 pos = m_host.GetWorldPosition();
+                int x = (int)((pos.X + offset.x)/ 16);
+                int y = (int)((pos.Y + offset.y)/ 16);
+                if (x < 0) x = 0;
+                if (x > 15) x = 15;
+                if (y < 0) y = 0;
+                if (y > 15) y = 15;
+                wind.x = module.WindSpeeds[y * 16 + x].X;
+                wind.y = module.WindSpeeds[y * 16 + x].Y;
+            }
+            return wind;
         }
 
         public void llSetStatus(int status, int value)