From 592f98c4aaa5265a31c481a49cfc7afb49590da3 Mon Sep 17 00:00:00 2001
From: Melanie Thielker
Date: Fri, 19 Sep 2008 17:00:17 +0000
Subject: Mantis #2217 Guard against NaN being returned from llRotBetween.
 Return a zero rotation if the result is NaN.

---
 .../Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'OpenSim/Region/ScriptEngine/Shared')

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 758cf4b..bff63f1 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -581,7 +581,15 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             LSL_Types.Vector3 axis = LSL_Types.Vector3.Norm(crossProduct);
             double s = Math.Sin(angle / 2);
 
-            return new LSL_Types.Quaternion(axis.x * s, axis.y * s, axis.z * s, (float)Math.Cos(angle / 2));
+            double x = axis.x * s;
+            double y = axis.y * s;
+            double z = axis.z * s;
+            double w = Math.Cos(angle / 2);
+
+            if(Double.IsNaN(x) || Double.IsNaN(y) || Double.IsNaN(z) || Double.IsNaN(w))
+                return new LSL_Types.Quaternion(0.0f, 0.0f, 0.0f, 1.0f);
+
+            return new LSL_Types.Quaternion((float)x, (float)y, (float)z, (float)w);
         }
 
         public void llWhisper(int channelID, string text)
-- 
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