diff --git a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
index 5893a113c3..045fbb157f 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -82,7 +82,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private Dictionary<string, ITerrainEffect> m_plugineffects;
         private ITerrainChannel m_revert;
         private Scene m_scene;
-        private bool m_tainted;
+        private volatile bool m_tainted;
 
         #region ICommandableModule Members
 
@@ -327,6 +327,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             }
         }
 
+        public void TaintTerrain ()
+        {
+            CheckForTerrainUpdates();
+        }
+
         #region Plugin Loading Methods
 
         private void LoadPlugins()
@@ -1080,6 +1085,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             m_scene.RegisterModuleCommander(m_commander);
         }
 
+
         #endregion
+
     }
 }
diff --git a/OpenSim/Region/CoreModules/World/Terrain/ITerrainEffect.cs b/OpenSim/Region/Framework/Interfaces/ITerrainEffect.cs
similarity index 94%
rename from OpenSim/Region/CoreModules/World/Terrain/ITerrainEffect.cs
rename to OpenSim/Region/Framework/Interfaces/ITerrainEffect.cs
index 40b9f5acd4..454aaaadf6 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/ITerrainEffect.cs
+++ b/OpenSim/Region/Framework/Interfaces/ITerrainEffect.cs
@@ -25,9 +25,7 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-using OpenSim.Region.Framework.Interfaces;
-
-namespace OpenSim.Region.CoreModules.World.Terrain
+namespace OpenSim.Region.Framework.Interfaces
 {
     public interface ITerrainEffect
     {
diff --git a/OpenSim/Region/CoreModules/World/Terrain/ITerrainModule.cs b/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
similarity index 89%
rename from OpenSim/Region/CoreModules/World/Terrain/ITerrainModule.cs
rename to OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
index 9ca7de0dc0..378a80d202 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/ITerrainModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
@@ -29,13 +29,19 @@
 using System.IO;
 using OpenMetaverse;
 
-namespace OpenSim.Region.CoreModules.World.Terrain
+namespace OpenSim.Region.Framework.Interfaces
 {
     public interface ITerrainModule
     {
         void LoadFromFile(string filename);
         void SaveToFile(string filename);
         void ModifyTerrain(UUID user, Vector3 pos, byte size, byte action, UUID agentId);
+
+        /// <summary>
+        /// Taint the terrain. This will lead to sending the terrain data to the clients again.
+        /// Use this if you change terrain data outside of the terrain module (e.g. in osTerrainSetHeight)
+        /// </summary>
+        void TaintTerrain();
         
         /// <summary>
         /// Load a terrain from a stream.