Mantis#1207. Thank you, TGlion for a patch that addresses:

Implementation of llModifyLand() and There is a bug on 
permission-check of land-terraforming: x an y-coordinates 
are interchanged on function-call ExternalChecksCanTerraformLand.
Correct: x is west, and y is north. 2) Missing check of 
"Other allow to terraform-flag" (Parcel.ParcelFlags.AllowTerraform)

OpenSim/Framework/IClientAPI.cs

@@ -61,7 +61,7 @@ namespace OpenSim.Framework
 
     public delegate void ModifyTerrain(
         float height, float seconds, byte size, byte action, float north, float west, float south, float east,
-        IClientAPI remoteClient);
+        UUID agentId);
 
     public delegate void SetAppearance(byte[] texture, List<byte> visualParamList);
 

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -4171,7 +4171,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                                                              modify.ModifyBlock.BrushSize,
                                                              modify.ModifyBlock.Action, modify.ParcelData[i].North,
                                                              modify.ParcelData[i].West, modify.ParcelData[i].South,
-                                                             modify.ParcelData[i].East, this);
+                                                             modify.ParcelData[i].East, this.AgentId);
                                     }
                                 }
                             }

OpenSim/Region/Environment/Modules/World/Permissions/PermissionsModule.cs

@@ -984,11 +984,9 @@ namespace OpenSim.Region.Environment.Modules.World.Permissions
                 DebugPermissionInformation(MethodInfo.GetCurrentMethod().Name);
                 if (m_bypassPermissions) return m_bypassPermissionsValue;
 
-                bool permission = false;
-
                 // Estate override
                 if (GenericEstatePermission(user))
-                    permission = true;
+                    return true;
 
                 float X = position.X;
                 float Y = position.Y;
@@ -1002,13 +1000,19 @@ namespace OpenSim.Region.Environment.Modules.World.Permissions
                 if (Y < 0)
                     Y = 0;
 
-                // Land owner can terraform too
                 ILandObject parcel = m_scene.LandChannel.GetLandObject(X, Y);
+                if (parcel == null)
+                    return false;
+
+                // Others allowed to terraform?
+                if ((parcel.landData.Flags & ((int)Parcel.ParcelFlags.AllowTerraform)) != 0)
+                    return true;
+
+                // Land owner can terraform too
                 if (parcel != null && GenericParcelPermission(user, parcel))
-                    permission = true;
+                    return true;
 
-
+                return false;
-                return permission;
             }
 
             private bool CanViewScript(UUID script, UUID objectID, UUID user, Scene scene)

OpenSim/Region/Environment/Modules/World/Terrain/Effects/CookieCutter.cs

@@ -41,6 +41,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.Effects
             bool[,] cliffMask = new bool[map.Width,map.Height];
             bool[,] channelMask = new bool[map.Width,map.Height];
             bool[,] smoothMask = new bool[map.Width,map.Height];
+            bool[,] allowMask = new bool[map.Width,map.Height];
 
             Console.WriteLine("S1");
 
@@ -52,6 +53,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.Effects
                 {
                     Console.Write(".");
                     smoothMask[x, y] = true;
+                    allowMask[x,y] = true;
 
                     // Start underwater
                     map[x, y] = TerrainUtil.PerlinNoise2D(x, y, 3, 0.25) * 5;
@@ -77,7 +79,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.Effects
                 for (y = 0; y < map.Height; y++)
                 {
                     if (cliffMask[x, y])
-                        eroder.PaintEffect(map, x, y, 4, 0.1);
+                        eroder.PaintEffect(map, allowMask, x, y, -1, 4, 0.1);
                 }
             }
 

OpenSim/Region/Environment/Modules/World/Terrain/ITerrainModule.cs

@@ -25,7 +25,9 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+
 using System.IO;
+using OpenMetaverse;
 
 namespace OpenSim.Region.Environment.Modules.World.Terrain
 {
@@ -33,6 +35,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain
     {
         void LoadFromFile(string filename);
         void SaveToFile(string filename);
+        void ModifyTerrain(Vector3 pos, byte size, byte action, UUID agentId);
         
         /// <summary>
         /// Load a terrain from a stream.

OpenSim/Region/Environment/Modules/World/Terrain/ITerrainPaintableEffect.cs

@@ -31,6 +31,6 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain
 {
     public interface ITerrainPaintableEffect
     {
-        void PaintEffect(ITerrainChannel map, double x, double y, double strength, double duration);
+        void PaintEffect(ITerrainChannel map, bool[,] allowMask, double x, double y, double z, double strength, double duration);
     }
 }

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/ErodeSphere.cs

@@ -150,7 +150,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
@@ -172,6 +172,8 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                 for (x = 0; x < water.Width; x++)
                 {
                     for (y = 0; y < water.Height; y++)
+                    {
+                        if (mask[x,y])
                         {
                             const double solConst = (1.0 / rounds);
                             double sedDelta = water[x, y] * solConst;
@@ -179,6 +181,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                             sediment[x, y] += sedDelta;
                         }
                     }
+                }
 
                 // Move water
                 for (x = 0; x < water.Width; x++)
@@ -291,6 +294,8 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 
                         double sedimentDeposit = sediment[x, y] - waterCapacity;
                         if (sedimentDeposit > 0)
+                        {
+                            if (mask[x,y])
                             {
                                 sediment[x, y] -= sedimentDeposit;
                                 map[x, y] += sedimentDeposit;
@@ -298,11 +303,12 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                         }
                     }
                 }
+            }
 
             // Deposit any remainder (should be minimal)
             for (x = 0; x < water.Width; x++)
                 for (y = 0; y < water.Height; y++)
-                    if (sediment[x, y] > 0)
+                    if (mask[x,y] && sediment[x, y] > 0)
                         map[x, y] += sediment[x, y];
         }
 

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/FlattenSphere.cs

@@ -25,48 +25,29 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
 using OpenSim.Region.Environment.Interfaces;
 
 namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 {
     public class FlattenSphere : ITerrainPaintableEffect
     {
-
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
             int x, y;
 
-            double sum = 0.0;
-            double step2 = 0.0;
-            duration = 0.009; //MCP Should be read from ini file
- 
-
-            // compute delta map
-            for (x = 0; x < map.Width; x++)
-            {
-                for (y = 0; y < map.Height; y++)
-                {
-                    double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
-
-                    if (z > 0) // add in non-zero amount
-                    {
-                        sum += map[x, y] * z;
-                        step2 += z;
-                    }
-                }
-            }
-
-            double avg = sum / step2;
-
             // blend in map
             for (x = 0; x < map.Width; x++)
             {
                 for (y = 0; y < map.Height; y++)
                 {
+                    if (!mask[x,y])
+                        continue;
+
                     double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength) * duration;
 
                     if (z > 0) // add in non-zero amount
@@ -74,8 +55,18 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                         if (z > 1.0)
                             z = 1.0;
 
-                        map[x, y] = (map[x, y] * (1.0 - z)) + (avg * z);
+                        map[x, y] = (map[x, y] * (1.0 - z)) + (rz * z);
                     }
+
+                    double delta = rz - map[x, y];
+                    if (Math.Abs(delta) > 0.1)
+                        delta *= 0.25;
+
+                    if (delta != 0) // add in non-zero amount
+                    {
+                        map[x, y] += delta;
+                    }
+ 
                 }
             }
         }

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/LowerSphere.cs

@@ -34,7 +34,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
     {
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
             duration = 0.03; //MCP Should be read from ini file
@@ -42,15 +42,10 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
             int x;
             for (x = 0; x < map.Width; x++)
             {
-                // Skip everything unlikely to be affected
-                if (Math.Abs(x - rx) > strength * 1.1)
-                    continue;
-
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
-                    // Skip everything unlikely to be affected
+                    if (!mask[x,y])
-                    if (Math.Abs(y - ry) > strength * 1.1)
                         continue;
 
                     // Calculate a sphere and add it to the heighmap

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/NoiseSphere.cs

@@ -35,22 +35,17 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
     {
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
             int x;
             for (x = 0; x < map.Width; x++)
             {
-                // Skip everything unlikely to be affected
-                if (Math.Abs(x - rx) > strength * 1.1)
-                    continue;
-
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
-                    // Skip everything unlikely to be affected
+                    if (!mask[x,y])
-                    if (Math.Abs(y - ry) > strength * 1.1)
                         continue;
 
                     // Calculate a sphere and add it to the heighmap

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/OlsenSphere.cs

@@ -151,7 +151,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
@@ -162,6 +162,9 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
+                    if (!mask[x,y])
+                        continue;
+
                     double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
 
                     if (z > 0) // add in non-zero amount

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/RaiseSphere.cs

@@ -35,7 +35,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
         #region ITerrainPaintableEffect Members
         
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             duration = 0.03; //MCP Should be read from ini file
             strength = TerrainUtil.MetersToSphericalStrength(strength);
@@ -43,15 +43,10 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
             int x;
             for (x = 0; x < map.Width; x++)
             {
-                // Skip everything unlikely to be affected
-                if (Math.Abs(x - rx) > strength * 1.1)
-                    continue;
-
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
-                    // Skip everything unlikely to be affected
+                    if (!mask[x,y])
-                    if (Math.Abs(y - ry) > strength * 1.1)
                         continue;
 
                     // Calculate a sphere and add it to the heighmap

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/RevertSphere.cs

@@ -41,7 +41,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
             duration = 0.03; //MCP Should be read from ini file
@@ -54,15 +54,10 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
             int x;
             for (x = 0; x < map.Width; x++)
             {
-                // Skip everything unlikely to be affected
-                if (Math.Abs(x - rx) > strength * 1.1)
-                    continue;
-
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
-                    // Skip everything unlikely to be affected
+                    if (!mask[x,y])
-                    if (Math.Abs(y - ry) > strength * 1.1)
                         continue;
 
                     // Calculate a sphere and add it to the heighmap

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/SmoothSphere.cs

@@ -33,7 +33,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
     {
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
@@ -76,6 +76,9 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
             {
                 for (y = 0; y < map.Height; y++)
                 {
+                    if (!mask[x,y])
+                        continue;
+
                     double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
 
                     if (z > 0) // add in non-zero amount

OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/WeatherSphere.cs

@@ -147,7 +147,7 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
 
         #region ITerrainPaintableEffect Members
 
-        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
+        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz, double strength, double duration)
         {
             strength = TerrainUtil.MetersToSphericalStrength(strength);
 
@@ -158,6 +158,9 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
                 int y;
                 for (y = 0; y < map.Height; y++)
                 {
+                    if (!mask[x,y])
+                        continue;
+
                     double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
 
                     if (z > 0) // add in non-zero amount

OpenSim/Region/Environment/Modules/World/Terrain/TerrainModule.cs

@@ -40,6 +40,7 @@ using OpenSim.Region.Environment.Modules.World.Terrain.FloodBrushes;
 using OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes;
 using OpenSim.Region.Environment.Scenes;
 
+
 namespace OpenSim.Region.Environment.Modules.World.Terrain
 {
     public class TerrainModule : IRegionModule, ICommandableModule, ITerrainModule
@@ -258,6 +259,18 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain
             throw new TerrainException(String.Format("unable to load heightmap from file {0}: no loader available for that format", filename));
         }
 
+        /// <summary>
+        /// Modify Land
+        /// </summary>
+        /// <param name="pos">Land-position (X,Y,0)</param>
+        /// <param name="size">The size of the brush (0=small, 1=medium, 2=large)</param>
+        /// <param name="action">0=LAND_LEVEL, 1=LAND_RAISE, 2=LAND_LOWER, 3=LAND_SMOOTH, 4=LAND_NOISE, 5=LAND_REVERT</param>
+        /// <param name="agentId">UUID of script-owner</param>
+        public void ModifyTerrain(Vector3 pos, byte size, byte action, UUID agentId)
+        {
+            client_OnModifyTerrain((float)pos.Z, (float)0.25, size, action, pos.Y, pos.X, pos.Y, pos.X, agentId);
+        }        
+
         /// <summary>
         /// Saves the current heightmap to a specified stream.
         /// </summary>
@@ -587,21 +600,49 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain
             );
         }
 
-        private void client_OnModifyTerrain(float height, float seconds, byte size, byte action, float north, float west,
+        private void client_OnModifyTerrain(float height, float seconds, byte size, byte action,
-                                            float south, float east, IClientAPI remoteClient)
+                                            float north, float west, float south, float east, UUID agentId)
-        {
-            // Not a good permissions check, if in area mode, need to check the entire area.
-            if (m_scene.ExternalChecks.ExternalChecksCanTerraformLand(remoteClient.AgentId, new Vector3(north, west, 0)))
         {
+            bool allowed = false;
             if (north == south && east == west)
             {
                 if (m_painteffects.ContainsKey((StandardTerrainEffects) action))
+                {
+                    bool[,] allowMask = new bool[m_channel.Width,m_channel.Height];
+                    allowMask.Initialize();
+                    int n = size + 1;
+                    if (n > 2)
+                        n = 4;
+
+                    int zx = (int) (west + 0.5);
+                    int zy = (int) (north + 0.5);
+
+                    int dx;
+                    for (dx=-n; dx<=n; dx++)
+                    {
+                        int dy;
+                        for (dy=-n; dy<=n; dy++)
+                        {
+                            int x = zx + dx;
+                            int y = zy + dy;
+                            if (x>=0 && y>=0 && x<m_channel.Width && y<m_channel.Height)
+                            {
+                                if (m_scene.ExternalChecks.ExternalChecksCanTerraformLand(agentId, new Vector3(x,y,0)))
+                                {
+                                    allowMask[x, y] = true;
+                                    allowed = true;
+                                }
+                            }
+                        }
+                    }
+                    if (allowed)
                     {
                         m_painteffects[(StandardTerrainEffects) action].PaintEffect(
-                            m_channel, west, south, size, seconds);
+                            m_channel, allowMask, west, south, height, size, seconds);
 
                         CheckForTerrainUpdates(true); //revert changes outside estate limits
                     }
+                }
                 else
                 {
                     m_log.Debug("Unknown terrain brush type " + action);
@@ -623,25 +664,31 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain
                             if (x < east && x > west)
                             {
                                 if (y < north && y > south)
+                                {
+                                    if (m_scene.ExternalChecks.ExternalChecksCanTerraformLand(agentId, new Vector3(x,y,0)))
                                     {
                                         fillArea[x, y] = true;
+                                        allowed = true;
+                                    }
                                 }
                             }
                         }
                     }
 
+                    if (allowed)
+                    {
                         m_floodeffects[(StandardTerrainEffects) action].FloodEffect(
                             m_channel, fillArea, size);
 
                         CheckForTerrainUpdates(true); //revert changes outside estate limits
                     }
+                }
                 else
                 {
                     m_log.Debug("Unknown terrain flood type " + action);
                 }
             }
         }
-        }
 
         private void client_OnBakeTerrain(IClientAPI remoteClient)
         {

OpenSim/Region/Environment/Modules/World/Terrain/Tests/TerrainTest.cs

@@ -37,19 +37,30 @@ namespace OpenSim.Region.Environment.Modules.World.Terrain.Tests
         [Test]
         public void BrushTest()
         {
-            TerrainChannel x = new TerrainChannel(256, 256);
+            TerrainChannel map = new TerrainChannel(256, 256);
+            bool[,] allowMask = new bool[map.Width,map.Height];
+            int x;
+            int y;
+            for (x=0; x<map.Width; x++)
+            {
+                for (y=0; y<map.Height; y++)
+                {
+                    allowMask[x,y] = true;
+                }
+            }
+
             ITerrainPaintableEffect effect = new RaiseSphere();
 
-            effect.PaintEffect(x, 128.0, 128.0, 100, 0.1);
+            effect.PaintEffect(map, allowMask, 128.0, 128.0, 23.0, 50, 0.1);
-            Assert.That(x[128, 128] > 0.0, "Raise brush not raising values.");
+            Assert.That(map[128, 128] > 0.0, "Raise brush not raising values.");
-            Assert.That(x[0, 128] > 0.0, "Raise brush lowering edge values.");
+            Assert.That(map[0, 128] > 0.0, "Raise brush lowering edge values.");
 
-            x = new TerrainChannel(256, 256);
+            map = new TerrainChannel(256, 256);
             effect = new LowerSphere();
 
-            effect.PaintEffect(x, 128.0, 128.0, 100, 0.1);
+            effect.PaintEffect(map, allowMask, 128.0, 128.0, -1, 50, 0.1);
-            Assert.That(x[128, 128] < 0.0, "Lower not lowering values.");
+            Assert.That(map[128, 128] < 0.0, "Lower not lowering values.");
-            Assert.That(x[0, 128] < 0.0, "Lower brush affecting edge values.");
+            Assert.That(map[0, 128] < 0.0, "Lower brush affecting edge values.");
         }
 
         [Test]

OpenSim/Region/Environment/Scenes/SceneObjectPart.cs

@@ -756,6 +756,7 @@ namespace OpenSim.Region.Environment.Scenes
             set
             {
                 StoreUndoState();
+if (m_shape != null) {
                 m_shape.Scale = value;
 
                 if (PhysActor != null && m_parentGroup != null)
@@ -769,6 +770,7 @@ namespace OpenSim.Region.Environment.Scenes
                         }
                     }
                 }
+}
                 TriggerScriptChangedEvent(Changed.SCALE);
             }
         }

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -42,6 +42,7 @@ using OpenSim.Region.Interfaces;
 using OpenSim.Region.Environment.Interfaces;
 using OpenSim.Region.Environment.Modules.Avatar.Currency.SampleMoney;
 using OpenSim.Region.Environment.Modules.World.Land;
+using OpenSim.Region.Environment.Modules.World.Terrain;
 using OpenSim.Region.Environment.Scenes;
 using OpenSim.Region.Physics.Manager;
 using OpenSim.Region.ScriptEngine.Shared;
@@ -3368,7 +3369,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public void llModifyLand(int action, int brush)
         {
             m_host.AddScriptLPS(1);
-            World.ExternalChecks.ExternalChecksCanTerraformLand(m_host.OwnerID, new Vector3(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y, 0));
+            ITerrainModule tm = m_ScriptEngine.World.RequestModuleInterface<ITerrainModule>();
+            if (tm != null)
+            {
+                tm.ModifyTerrain(m_host.AbsolutePosition, (byte) brush, (byte) action, m_host.OwnerID);
+            }
         }
 
         public void llCollisionSound(string impact_sound, double impact_volume)