diff --git a/bin/TerrainFilters/demofilter.cs b/bin/TerrainFilters/demofilter.cs
index 79b8d056cb..1fdfc95e0a 100644
--- a/bin/TerrainFilters/demofilter.cs
+++ b/bin/TerrainFilters/demofilter.cs
@@ -22,3 +22,29 @@ public class DemoFilter : ITerrainFilter
         return "demofilter - Does nothing\n";
     }
 }
+
+public class SineFilter : ITerrainFilter
+{
+    public void Filter(Channel heightmap, string[] args)
+    {
+        double max = heightmap.findMax();
+
+        for (int x = 0; x < heightmap.w; x++)
+        {
+            for (int y = 0; y < heightmap.h; y++)
+            {
+                heightmap.set(x,y,((Math.Sin(heightmap.get(x,y) * Convert.ToDouble(args[1])) + 1) / 2) * max);
+            }
+        }
+    }
+
+    public string Register()
+    {
+        return "sinefilter";
+    }
+
+    public string Help()
+    {
+        return "sinefilter <theta> - Converts the heightmap to the functional output of a sine wave";
+    }
+}
\ No newline at end of file