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diff --git a/OpenSim/Region/PhysicsModules/ConvexDecompositionDotNet/Plane.cs b/OpenSim/Region/PhysicsModules/ConvexDecompositionDotNet/Plane.cs
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+++ b/OpenSim/Region/PhysicsModules/ConvexDecompositionDotNet/Plane.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.PhysicsModule.ConvexDecompositionDotNet
+{
+    public class Plane
+    {
+        public float3 normal = new float3();
+        public float dist; // distance below origin - the D from plane equasion Ax+By+Cz+D=0
+
+        public Plane(float3 n, float d)
+        {
+            normal = new float3(n);
+            dist = d;
+        }
+
+        public Plane(Plane p)
+        {
+            normal = new float3(p.normal);
+            dist = p.dist;
+        }
+
+        public Plane()
+        {
+            dist = 0;
+        }
+
+        public void Transform(float3 position, Quaternion orientation)
+        {
+            //   Transforms the plane to the space defined by the
+            //   given position/orientation
+            float3 newNormal = Quaternion.Inverse(orientation) * normal;
+            float3 origin = Quaternion.Inverse(orientation) * (-normal * dist - position);
+
+            normal = newNormal;
+            dist = -float3.dot(newNormal, origin);
+        }
+
+        public override int GetHashCode()
+        {
+            return normal.GetHashCode() ^ dist.GetHashCode();
+        }
+
+        public override bool Equals(object obj)
+        {
+            Plane p = obj as Plane;
+            if (p == null)
+                return false;
+
+            return this == p;
+        }
+
+        public static bool operator ==(Plane a, Plane b)
+        {
+            return (a.normal == b.normal && a.dist == b.dist);
+        }
+
+        public static bool operator !=(Plane a, Plane b)
+        {
+            return !(a == b);
+        }
+
+        public static Plane PlaneFlip(Plane plane)
+        {
+            return new Plane(-plane.normal, -plane.dist);
+        }
+
+        public static bool coplanar(Plane a, Plane b)
+        {
+            return (a == b || a == PlaneFlip(b));
+        }
+    }
+}