1 files changed, 51 insertions, 0 deletions

diff --git a/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs b/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs
new file mode 100644
index 0000000..c52d2c8
--- /dev/null
+++ b/OpenSim/Region/Environment/Modules/Terrain/TerrainUtil.cs
@@ -0,0 +1,51 @@
+using System;

+using OpenSim.Region.Environment.Interfaces;

+

+namespace OpenSim.Region.Environment.Modules.Terrain

+{

+    public static class TerrainUtil

+    {

+        public static double MetersToSphericalStrength(double size)

+        {

+            return Math.Pow(2, size);

+        }

+

+        public static double SphericalFactor(double x, double y, double rx, double ry, double size)

+        {

+            return size * size - ((x - rx) * (x - rx) + (y - ry) * (y - ry));

+        }

+

+        public static double GetBilinearInterpolate(double x, double y, ITerrainChannel map)

+        {

+            int w = map.Width;

+            int h = map.Height;

+

+            if (x > w - 2.0)

+                x = w - 2.0;

+            if (y > h - 2.0)

+                y = h - 2.0;

+            if (x < 0.0)

+                x = 0.0;

+            if (y < 0.0)

+                y = 0.0;

+

+            int stepSize = 1;

+            double h00 = map[(int)x, (int)y];

+            double h10 = map[(int)x + stepSize, (int)y];

+            double h01 = map[(int)x, (int)y + stepSize];

+            double h11 = map[(int)x + stepSize, (int)y + stepSize];

+            double h1 = h00;

+            double h2 = h10;

+            double h3 = h01;

+            double h4 = h11;

+            double a00 = h1;

+            double a10 = h2 - h1;

+            double a01 = h3 - h1;

+            double a11 = h1 - h2 - h3 + h4;

+            double partialx = x - (int)x;

+            double partialz = y - (int)y;

+            double hi = a00 + (a10 * partialx) + (a01 * partialz) + (a11 * partialx * partialz);

+            return hi;

+        }

+    }

+}