From eb190905b5462b33695de9c330a434a4b673a0eb Mon Sep 17 00:00:00 2001
From: Dahlia Trimble
Date: Tue, 7 Apr 2009 07:59:32 +0000
Subject: Thanks Ewe Loon for Mantis #3007 - llAngleBetween is producing
 numbers greater then Pi Radians. Also modified to use the system constant for
 Pi and prevent negative results.

---
 OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index bcbfe96..013ea27 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -4277,7 +4277,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         {
             m_host.AddScriptLPS(1);
 
-            return (double) Math.Acos(a.x * b.x + a.y * b.y + a.z * b.z + a.s * b.s) * 2;
+            double angle = Math.Acos(a.x * b.x + a.y * b.y + a.z * b.z + a.s * b.s) * 2;
+            if (angle < 0) angle = -angle;
+            if (angle > Math.PI) return (Math.PI * 2 - angle);
+            return angle; 
         }
 
         public LSL_String llGetInventoryKey(string name)
-- 
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