From 71a4b02c7e9a2587759fd40092d1bdcfef648eff Mon Sep 17 00:00:00 2001
From: Adam Frisby
Date: Thu, 24 Sep 2009 20:56:01 +1000
Subject: * Minor commit, added two new math utility functions.

---
 OpenSim/Framework/Util.cs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 58344f3..45b5a10 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -70,6 +70,39 @@ namespace OpenSim.Framework
         public static readonly Regex UUIDPattern 
             = new Regex("^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$");
         
+        /// <summary>
+        /// Linear interpolates B<->C using percent A
+        /// </summary>
+        /// <param name="a"></param>
+        /// <param name="b"></param>
+        /// <param name="c"></param>
+        /// <returns></returns>
+        public static double lerp(double a, double b, double c)
+        {
+            return (b*a) + (c*(1 - a));
+        }
+
+        /// <summary>
+        /// Bilinear Interpolate, see Lerp but for 2D using 'percents' X & Y.
+        /// Layout:
+        ///     A B
+        ///     C D
+        /// A<->C = Y
+        /// C<->D = X
+        /// </summary>
+        /// <param name="x"></param>
+        /// <param name="y"></param>
+        /// <param name="a"></param>
+        /// <param name="b"></param>
+        /// <param name="c"></param>
+        /// <param name="d"></param>
+        /// <returns></returns>
+        public static double lerp2D(double x, double y, double a, double b, double c, double d)
+        {
+            return lerp(y, lerp(x, a, b), lerp(x, c, d));
+        }
+
+
         /// <value>
         /// Well known UUID for the blank texture used in the Linden SL viewer version 1.20 (and hopefully onwards) 
         /// </value>
-- 
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