'terrain modify' command for area-of-effect operations

Signed-off-by: Michael Cerquoni <nebadon2025@gmail.com>

6 files changed, 598 insertions, 0 deletions

diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/FillModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/FillModifier.cs
new file mode 100644
index 0000000..0df7132
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/FillModifier.cs
@@ -0,0 +1,94 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class FillModifier : TerrainModifier
+    {
+
+        public FillModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "fill <height> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<height2>]"
+                                + "\nSets all points within the specified range to the specified value.";
+            return val;
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double result = data.elevation - (data.elevation - data.bevelevation) * factor;
+            return result;
+        }
+
+    }
+
+}
+
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/LowerModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/LowerModifier.cs
new file mode 100644
index 0000000..3e4a457
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/LowerModifier.cs
@@ -0,0 +1,93 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class LowerModifier : TerrainModifier
+    {
+        public LowerModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "lower <delta> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<delta2>]"
+                            + "\nLowers all points within the specified range by the specified amount.";
+            return val;
+
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double result = map[x, y] - (data.elevation - (data.elevation - data.bevelevation) * factor);
+            return result;
+        }
+
+    }
+
+}
+
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MaxModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MaxModifier.cs
new file mode 100644
index 0000000..02f1852
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MaxModifier.cs
@@ -0,0 +1,93 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class MaxModifier : TerrainModifier
+    {
+        public MaxModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "max <height> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<height2>]"
+                            + "\nEnsures that all points within the specified range are no higher than the specified value.";
+            return val;
+
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double result = Math.Min(data.elevation - (data.elevation - data.bevelevation) * factor, map[x, y]);
+            return result;
+        }
+
+    }
+
+}
+
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MinModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MinModifier.cs
new file mode 100644
index 0000000..2db49c8
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/MinModifier.cs
@@ -0,0 +1,93 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class MinModifier : TerrainModifier
+    {
+        public MinModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "min <height> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<height2>]"
+                + "\nEnsures that all points within the specified range are no lower than the specified value.";
+            return val;
+
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double result = Math.Max(data.elevation - (data.elevation - data.bevelevation) * factor, map[x, y]);
+            return result;
+        }
+
+    }
+
+}
+
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/RaiseModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/RaiseModifier.cs
new file mode 100644
index 0000000..9ac1edd
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/RaiseModifier.cs
@@ -0,0 +1,93 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class RaiseModifier : TerrainModifier
+    {
+        public RaiseModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "raise <delta> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<delta2>]"
+                            + "\nRaises all points within the specified range by the specified amount.";
+            return val;
+
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double result = map[x, y] + (data.elevation - (data.elevation - data.bevelevation) * factor);
+            return result;
+        }
+
+    }
+
+}
+
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/SmoothModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/SmoothModifier.cs
new file mode 100644
index 0000000..1731cd8
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/SmoothModifier.cs
@@ -0,0 +1,132 @@
+/*
+ * 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 OpenSimulator 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.Region.CoreModules.World.Terrain;
+using OpenSim.Region.Framework.Interfaces;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class SmoothModifier : TerrainModifier
+    {
+        public SmoothModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            string val;
+            string result;
+            if (args.Length < 3)
+            {
+                result = "Usage: " + GetUsage();
+            }
+            else
+            {
+                TerrainModifierData data;
+                result = this.parseParameters(args, out data);
+
+                // Context-specific validation
+                if (result == String.Empty)
+                {
+                    if (data.bevel == "taper")
+                    {
+                        if (data.bevelevation < 0.01 || data.bevelevation > 0.99)
+                        {
+                            result = String.Format("Taper must be 0.01 to 0.99 {0}", data.bevelevation);
+                        }
+                    }
+                    else
+                    {
+                        data.bevelevation = 2.0f / 3.0f;
+                    }
+
+                    if (data.elevation < 0.0 || data.elevation > 1.0)
+                    {
+                        result = String.Format("Scaling factor must be 0.0 to 1.0: {0}", data.elevation);
+                    }
+
+                    if (data.shape == String.Empty)
+                    {
+                        data.shape = "rectangle";
+                        data.x0 = 0;
+                        data.y0 = 0;
+                        data.dx = map.Width;
+                        data.dy = map.Height;
+                    }
+                }
+
+                // if it's all good, then do the work
+                if (result == String.Empty)
+                {
+                    this.applyModification(map, data);
+                }
+            }
+
+            return result;
+        }
+
+        public override string GetUsage()
+        {
+            string val = "smooth <strength> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<fraction>]"
+                                + "\nSmooths all points within the specified range using a simple averaging algorithm.";
+            return val;
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double[] scale = new double[3];
+            scale[0] = data.elevation;
+            scale[1] = ((1.0 - scale[0]) * data.bevelevation) / 8.0;
+            scale[2] = ((1.0 - scale[0]) * (1.0 - data.bevelevation)) / 16.0;
+            int xMax = map.GetLength(0);
+            int yMax = map.GetLength(1);
+            double result;
+            if ((x == 0) || (y == 0) || (x == (xMax - 1)) || (y == (yMax - 1)))
+            {
+                result = map[x, y];
+            }
+            else
+            {
+                result = 0.0;
+                for(int yPos = (y - 2); yPos < (y + 3); yPos++)
+                {
+                    int yVal = (yPos <= 0) ? 0 : ((yPos < yMax) ? yPos : yMax - 1);
+                    for(int xPos = (x - 2); xPos < (x + 3); xPos++)
+                    {
+                        int xVal = (xPos <= 0) ? 0 : ((xPos < xMax) ? xPos : xMax - 1);
+                        int dist = Math.Max(Math.Abs(x - xVal), Math.Abs(y - yVal));
+                        result += map[xVal, yVal] * scale[dist];
+                    }
+                }
+            }
+            return result;
+        }
+
+    }
+
+}
+