From 93e1986d690cda415c9cce639a2656bc773a9a29 Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Mon, 6 May 2013 16:48:01 -0700
Subject: BulletSim: apply linear and angular friction in vehicle coordinates
 and not world coordinates.

---
 OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'OpenSim')

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
index 272a162..04ea289 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
@@ -1042,12 +1042,12 @@ namespace OpenSim.Region.Physics.BulletSPlugin
             VehicleVelocity += linearMotorVelocityW;
 
             // Friction reduces vehicle motion
-            Vector3 frictionFactor = ComputeFrictionFactor(m_linearFrictionTimescale, pTimestep);
-            VehicleVelocity -= (VehicleVelocity * frictionFactor);
+            Vector3 frictionFactorW = ComputeFrictionFactor(m_linearFrictionTimescale, pTimestep) * VehicleOrientation;
+            VehicleVelocity -= (VehicleVelocity * frictionFactorW);
 
             VDetailLog("{0},  MoveLinear,velocity,origVelW={1},velV={2},correctV={3},correctW={4},newVelW={5},fricFact={6}",
                         ControllingPrim.LocalID, origVelW, currentVelV, linearMotorCorrectionV,
-                        linearMotorVelocityW, VehicleVelocity, frictionFactor);
+                        linearMotorVelocityW, VehicleVelocity, frictionFactorW);
         }
 
         public void ComputeLinearTerrainHeightCorrection(float pTimestep)
@@ -1340,10 +1340,10 @@ namespace OpenSim.Region.Physics.BulletSPlugin
             VehicleRotationalVelocity += angularMotorContributionV * VehicleOrientation;
 
             // Reduce any velocity by friction.
-            Vector3 frictionFactor = ComputeFrictionFactor(m_angularFrictionTimescale, pTimestep);
-            VehicleRotationalVelocity -= (VehicleRotationalVelocity * frictionFactor);
+            Vector3 frictionFactorW = ComputeFrictionFactor(m_angularFrictionTimescale, pTimestep) * VehicleOrientation;
+            VehicleRotationalVelocity -= (VehicleRotationalVelocity * frictionFactorW);
 
-            VDetailLog("{0},  MoveAngular,angularTurning,angularMotorContrib={1}", ControllingPrim.LocalID, angularMotorContributionV);
+            VDetailLog("{0},  MoveAngular,angularTurning,angContribV={1}", ControllingPrim.LocalID, angularMotorContributionV);
         }
 
         // From http://wiki.secondlife.com/wiki/Linden_Vehicle_Tutorial:
-- 
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