From 5f1f5ea5ab5badf5944471fefe0a45f7b4f41b91 Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Fri, 24 May 2013 16:24:16 -0700
Subject: BulletSim: add VehicleInertiaFactor to allow modifying inertia.
 Another parameter for vehicle operation tuning. Default to <1,1,1> which
 means nothing is different under normal use.

---
 OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs | 3 ++-
 OpenSim/Region/Physics/BulletSPlugin/BSParam.cs    | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
index c16b7d3..311cf4f 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs
@@ -617,7 +617,8 @@ namespace OpenSim.Region.Physics.BulletSPlugin
                 // Vehicles report collision events so we know when it's on the ground
                 m_physicsScene.PE.AddToCollisionFlags(ControllingPrim.PhysBody, CollisionFlags.BS_VEHICLE_COLLISIONS);
 
-                ControllingPrim.Inertia = m_physicsScene.PE.CalculateLocalInertia(ControllingPrim.PhysShape.physShapeInfo, m_vehicleMass);
+                Vector3 inertia = m_physicsScene.PE.CalculateLocalInertia(ControllingPrim.PhysShape.physShapeInfo, m_vehicleMass);
+                ControllingPrim.Inertia = inertia * BSParam.VehicleInertiaFactor;
                 m_physicsScene.PE.SetMassProps(ControllingPrim.PhysBody, m_vehicleMass, ControllingPrim.Inertia);
                 m_physicsScene.PE.UpdateInertiaTensor(ControllingPrim.PhysBody);
 
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
index c19eda1..e98a7fb 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
@@ -148,6 +148,7 @@ public static class BSParam
     public static float VehicleRestitution { get; private set; }
     public static Vector3 VehicleLinearFactor { get; private set; }
     public static Vector3 VehicleAngularFactor { get; private set; }
+    public static Vector3 VehicleInertiaFactor { get; private set; }
     public static float VehicleGroundGravityFudge { get; private set; }
     public static float VehicleAngularBankingTimescaleFudge { get; private set; }
     public static bool VehicleDebuggingEnable { get; private set; }
@@ -583,6 +584,8 @@ public static class BSParam
             new Vector3(1f, 1f, 1f) ),
         new ParameterDefn<Vector3>("VehicleAngularFactor", "Fraction of physical angular changes applied to vehicle (<0,0,0> to <1,1,1>)",
             new Vector3(1f, 1f, 1f) ),
+        new ParameterDefn<Vector3>("VehicleInertiaFactor", "Fraction of physical inertia applied (<0,0,0> to <1,1,1>)",
+            new Vector3(1f, 1f, 1f) ),
         new ParameterDefn<float>("VehicleFriction", "Friction of vehicle on the ground (0.0 - 1.0)",
             0.0f ),
         new ParameterDefn<float>("VehicleRestitution", "Bouncyness factor for vehicles (0.0 - 1.0)",
-- 
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