BulletSim: simplify the initialization of some of the parameters.

Disable vertical attraction for vehicles by default (for the moment).
Fix bug where vehicle would go crazy when velocity got above a
   certain speed.

OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs

@@ -141,7 +141,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
         //    in changes by making enablement of debugging flags from INI file.
         public void SetupVehicleDebugging()
         {
-            enableAngularVerticalAttraction = true;
+            enableAngularVerticalAttraction = false;
             enableAngularDeflection = false;
             enableAngularBanking = false;
             if (BSParam.VehicleDebuggingEnabled != ConfigurationParameters.numericFalse)
@@ -803,7 +803,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
                     m_knownVelocity = Prim.ForceVelocity;
                     m_knownHas |= m_knownChangedVelocity;
                 }
-                return (Vector3)m_knownVelocity;
+                return m_knownVelocity;
             }
             set
             {
@@ -926,6 +926,8 @@ namespace OpenSim.Region.Physics.BulletSPlugin
         // Called after the simulation step
         internal void PostStep(float pTimestep)
         {
+            if (!IsActive) return;
+
             if (PhysicsScene.VehiclePhysicalLoggingEnabled)
                 PhysicsScene.PE.DumpRigidBody(PhysicsScene.World, Prim.PhysBody);
         }
@@ -961,10 +963,13 @@ namespace OpenSim.Region.Physics.BulletSPlugin
             // ==================================================================
             // Clamp high or low velocities
             float newVelocityLengthSq = VehicleVelocity.LengthSquared();
-            if (newVelocityLengthSq > BSParam.VehicleMaxLinearVelocity)
+            if (newVelocityLengthSq > BSParam.VehicleMaxLinearVelocitySq)
             {
+                Vector3 origVelW = VehicleVelocity;         // DEBUG DEBUG
                 VehicleVelocity /= VehicleVelocity.Length();
                 VehicleVelocity *= BSParam.VehicleMaxLinearVelocity;
+                VDetailLog("{0},  MoveLinear,clampMax,origVelW={1},lenSq={2},maxVelSq={3},,newVelW={4}", 
+                            Prim.LocalID, origVelW, newVelocityLengthSq, BSParam.VehicleMaxLinearVelocitySq, VehicleVelocity);
             }
             else if (newVelocityLengthSq < 0.001f)
                 VehicleVelocity = Vector3.Zero;
@@ -1301,6 +1306,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
             if (enableAngularVerticalAttraction && m_verticalAttractionTimescale < m_verticalAttractionCutoff)
             {
                 Vector3 vertContributionV = Vector3.Zero;
+                Vector3 origRotVelW = VehicleRotationalVelocity;        // DEBUG DEBUG
 
                 // Take a vector pointing up and convert it from world to vehicle relative coords.
                 Vector3 verticalError = Vector3.UnitZ * VehicleOrientation;
@@ -1328,13 +1334,14 @@ namespace OpenSim.Region.Physics.BulletSPlugin
 
                 // 'vertContrbution' is now the necessary angular correction to correct tilt in one second.
                 //     Correction happens over a number of seconds.
-                Vector3 unscaledContrib = vertContributionV;     // DEBUG DEBUG
+                Vector3 unscaledContribVerticalErrorV = vertContributionV;     // DEBUG DEBUG
                 vertContributionV /= m_verticalAttractionTimescale;
 
                 VehicleRotationalVelocity += vertContributionV * VehicleOrientation;
 
-                VDetailLog("{0},  MoveAngular,verticalAttraction,,verticalError={1},unscaled={2},eff={3},ts={4},vertAttr={5}",
+                VDetailLog("{0},  MoveAngular,verticalAttraction,,origRotVW={1},vertError={2},unscaledV={3},eff={4},ts={5},vertContribV={6}",
-                                Prim.LocalID, verticalError, unscaledContrib, m_verticalAttractionEfficiency, m_verticalAttractionTimescale, vertContributionV);
+                                Prim.LocalID, origRotVelW, verticalError, unscaledContribVerticalErrorV, 
+                                m_verticalAttractionEfficiency, m_verticalAttractionTimescale, vertContributionV);
             }
         }
 

OpenSim/Region/Physics/BulletSPlugin/BSParam.cs

@@ -84,32 +84,16 @@ public static class BSParam
 
     // Vehicle parameters
     public static float VehicleMaxLinearVelocity { get; private set; }
+    public static float VehicleMaxLinearVelocitySq { get; private set; }
     public static float VehicleMaxAngularVelocity { get; private set; }
+    public static float VehicleMaxAngularVelocitySq { get; private set; }
     public static float VehicleAngularDamping { get; private set; }
     public static float VehicleFriction { get; private set; }
     public static float VehicleRestitution { get; private set; }
     public static float VehicleLinearFactor { get; private set; }
-    private static Vector3? vehicleLinearFactorV;
+    public static Vector3 VehicleLinearFactorV { get; private set; }
-    public static Vector3 VehicleLinearFactorV
-    {
-        get
-        {
-            if (!vehicleLinearFactorV.HasValue)
-                vehicleLinearFactorV = new Vector3(VehicleLinearFactor, VehicleLinearFactor, VehicleLinearFactor);
-            return (Vector3)vehicleLinearFactorV;
-        }
-    }
     public static float VehicleAngularFactor { get; private set; }
-    private static Vector3? vehicleAngularFactorV;
+    public static Vector3 VehicleAngularFactorV { get; private set; }
-    public static Vector3 VehicleAngularFactorV
-    {
-        get
-        {
-            if (!vehicleAngularFactorV.HasValue)
-                vehicleAngularFactorV = new Vector3(VehicleAngularFactor, VehicleAngularFactor, VehicleAngularFactor);
-            return (Vector3)vehicleAngularFactorV;
-        }
-    }
     public static float VehicleGroundGravityFudge { get; private set; }
     public static float VehicleDebuggingEnabled { get; private set; }
 
@@ -469,12 +453,12 @@ public static class BSParam
             1000.0f,
             (s,cf,p,v) => { VehicleMaxLinearVelocity = cf.GetFloat(p, v); },
             (s) => { return (float)VehicleMaxLinearVelocity; },
-            (s,p,l,v) => { VehicleMaxLinearVelocity = v; } ),
+            (s,p,l,v) => { VehicleMaxLinearVelocity = v; VehicleMaxLinearVelocitySq = v * v; } ),
         new ParameterDefn("VehicleMaxAngularVelocity", "Maximum rotational velocity magnitude that can be assigned to a vehicle",
             12.0f,
             (s,cf,p,v) => { VehicleMaxAngularVelocity = cf.GetFloat(p, v); },
             (s) => { return (float)VehicleMaxAngularVelocity; },
-            (s,p,l,v) => { VehicleMaxAngularVelocity = v; } ),
+            (s,p,l,v) => { VehicleMaxAngularVelocity = v; VehicleMaxAngularVelocitySq = v * v; } ),
         new ParameterDefn("VehicleAngularDamping", "Factor to damp vehicle angular movement per second (0.0 - 1.0)",
             0.0f,
             (s,cf,p,v) => { VehicleAngularDamping = cf.GetFloat(p, v); },
@@ -484,24 +468,24 @@ public static class BSParam
             1.0f,
             (s,cf,p,v) => { VehicleLinearFactor = cf.GetFloat(p, v); },
             (s) => { return VehicleLinearFactor; },
-            (s,p,l,v) => { VehicleLinearFactor = v; } ),
+            (s,p,l,v) => { VehicleLinearFactor = v; VehicleLinearFactorV = new Vector3(v, v, v); } ),
         new ParameterDefn("VehicleAngularFactor", "Fraction of physical angular changes applied to vehicle (0.0 - 1.0)",
             1.0f,
             (s,cf,p,v) => { VehicleAngularFactor = cf.GetFloat(p, v); },
             (s) => { return VehicleAngularFactor; },
-            (s,p,l,v) => { VehicleAngularFactor = v; } ),
+            (s,p,l,v) => { VehicleAngularFactor = v; VehicleAngularFactorV = new Vector3(v, v, v); } ),
         new ParameterDefn("VehicleFriction", "Friction of vehicle on the ground (0.0 - 1.0)",
             0.0f,
             (s,cf,p,v) => { VehicleFriction = cf.GetFloat(p, v); },
             (s) => { return VehicleFriction; },
             (s,p,l,v) => { VehicleFriction = v; } ),
         new ParameterDefn("VehicleRestitution", "Bouncyness factor for vehicles (0.0 - 1.0)",
-            0.2f,
+            0.0f,
             (s,cf,p,v) => { VehicleRestitution = cf.GetFloat(p, v); },
             (s) => { return VehicleRestitution; },
             (s,p,l,v) => { VehicleRestitution = v; } ),
         new ParameterDefn("VehicleGroundGravityFudge", "Factor to multiple gravity if a ground vehicle is probably on the ground (0.0 - 1.0)",
-            1.0f,
+            0.2f,
             (s,cf,p,v) => { VehicleGroundGravityFudge = cf.GetFloat(p, v); },
             (s) => { return VehicleGroundGravityFudge; },
             (s,p,l,v) => { VehicleGroundGravityFudge = v; } ),