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diff --git a/OpenSim/Region/Physics/ConvexDecompositionDotNet/int3.cs b/OpenSim/Region/Physics/ConvexDecompositionDotNet/int3.cs
new file mode 100644
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+++ b/OpenSim/Region/Physics/ConvexDecompositionDotNet/int3.cs
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+/* The MIT License
+ * 
+ * Copyright (c) 2010 Intel Corporation.
+ * All rights reserved.
+ *
+ * Based on the convexdecomposition library from 
+ * <http://codesuppository.googlecode.com> by John W. Ratcliff and Stan Melax.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+using System;
+
+namespace OpenSim.Region.Physics.ConvexDecompositionDotNet
+{
+    public class int3
+    {
+        public int x;
+        public int y;
+        public int z;
+
+        public int3()
+        {
+        }
+
+        public int3(int _x, int _y, int _z)
+        {
+            x = _x;
+            y = _y;
+            z = _z;
+        }
+
+        public int this[int i]
+        {
+            get
+            {
+                switch (i)
+                {
+                    case 0: return x;
+                    case 1: return y;
+                    case 2: return z;
+                }
+                throw new ArgumentOutOfRangeException();
+            }
+            set
+            {
+                switch (i)
+                {
+                    case 0: x = value; return;
+                    case 1: y = value; return;
+                    case 2: z = value; return;
+                }
+                throw new ArgumentOutOfRangeException();
+            }
+        }
+
+        public override int GetHashCode()
+        {
+            return x.GetHashCode() ^ y.GetHashCode() ^ z.GetHashCode();
+        }
+
+        public override bool Equals(object obj)
+        {
+            int3 i = obj as int3;
+            if (i == null)
+                return false;
+
+            return this == i;
+        }
+
+        public static bool operator ==(int3 a, int3 b)
+        {
+            // If both are null, or both are same instance, return true.
+            if (System.Object.ReferenceEquals(a, b))
+                return true;
+            // If one is null, but not both, return false.
+            if (((object)a == null) || ((object)b == null))
+                return false;
+
+            for (int i = 0; i < 3; i++)
+            {
+                if (a[i] != b[i])
+                    return false;
+            }
+            return true;
+        }
+
+        public static bool operator !=(int3 a, int3 b)
+        {
+            return !(a == b);
+        }
+
+        public static int3 roll3(int3 a)
+        {
+            int tmp = a[0];
+            a[0] = a[1];
+            a[1] = a[2];
+            a[2] = tmp;
+            return a;
+        }
+
+        public static bool isa(int3 a, int3 b)
+        {
+            return (a == b || roll3(a) == b || a == roll3(b));
+        }
+
+        public static bool b2b(int3 a, int3 b)
+        {
+            return isa(a, new int3(b[2], b[1], b[0]));
+        }
+    }
+}