1 files changed, 108 insertions, 0 deletions

diff --git a/OpenSim/Region/CoreModules/World/Terrain/Modifiers/NoiseModifier.cs b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/NoiseModifier.cs
new file mode 100644
index 0000000..d6b95d0
--- /dev/null
+++ b/OpenSim/Region/CoreModules/World/Terrain/Modifiers/NoiseModifier.cs
@@ -0,0 +1,108 @@
+/*
+ * 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;
+using OpenSim.Region.Framework.Scenes;
+
+namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
+{
+    public class NoiseModifier : TerrainModifier
+    {
+        public NoiseModifier(ITerrainModule module) : base(module)
+        {
+        }
+
+        public override string ModifyTerrain(ITerrainChannel map, string[] args)
+        {
+            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 < 0.0 || data.bevelevation > 1.0)
+                        {
+                            result = String.Format("Taper must be 0.0 to 1.0: {0}", data.bevelevation);
+                        }
+                    }
+                    else
+                    {
+                        data.bevelevation = 1.0f;
+                    }
+
+                    if (data.elevation < 0.0 || data.elevation > 1.0)
+                    {
+                        result = String.Format("Noise strength 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 = "noise <delta> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<delta2>]"
+                                + "\nAdds noise to all points within the specified range.";
+            return val;
+        }
+
+        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
+        {
+            double factor = this.computeBevel(data, x, y);
+            double noise = TerrainUtil.PerlinNoise2D((double)x / map.GetLength(0), (double)y / map.GetLength(1), 8, 1.0);
+            return map[x, y] + (data.elevation - (data.elevation - data.bevelevation) * factor) * (noise - .5);
+        }
+
+    }
+
+}