From 2b6d22691141b8cdccfc44d25890f99e1f72b3dd Mon Sep 17 00:00:00 2001
From: Robert Adams <Robert.Adams@intel.com>
Date: Sat, 2 Feb 2013 13:33:44 -0800
Subject: [PATCH] BulletSim: correct angular vertical attraction to properly
 correct an upside down vehicle.

---
 OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
index 8ecf2ff521..b51e9fd17a 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
@@ -1326,7 +1326,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
                 // If verticalError.Z is negative, the vehicle is upside down. Add additional push.
                 if (verticalError.Z < 0f)
                 {
-                    vertContributionV.X += PIOverFour;
+                    vertContributionV.X += Math.Sign(vertContributionV.X) * PIOverFour;
                     // vertContribution.Y -= PIOverFour;
                 }