5 files changed, 152 insertions, 158 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs b/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
index 04e77b8..39e62dd 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
@@ -1088,7 +1088,7 @@ private sealed class BulletConstraintXNA : BulletConstraint
     {
         CollisionWorld.WorldData.ParamData p = new CollisionWorld.WorldData.ParamData();
 
-        p.angularDamping = o[0].XangularDamping;
+        p.angularDamping = BSParam.AngularDamping;
         p.defaultFriction = o[0].defaultFriction;
         p.defaultFriction = o[0].defaultFriction;
         p.defaultDensity = o[0].defaultDensity;
@@ -1096,32 +1096,32 @@ private sealed class BulletConstraintXNA : BulletConstraint
         p.collisionMargin = o[0].collisionMargin;
         p.gravity = o[0].gravity;
 
-        p.linearDamping = o[0].XlinearDamping;
-        p.angularDamping = o[0].XangularDamping;
-        p.deactivationTime = o[0].XdeactivationTime;
-        p.linearSleepingThreshold = o[0].XlinearSleepingThreshold;
-        p.angularSleepingThreshold = o[0].XangularSleepingThreshold;
-        p.ccdMotionThreshold = o[0].XccdMotionThreshold;
-        p.ccdSweptSphereRadius = o[0].XccdSweptSphereRadius;
-        p.contactProcessingThreshold = o[0].XcontactProcessingThreshold;
-
-        p.terrainImplementation = o[0].XterrainImplementation;
-        p.terrainFriction = o[0].XterrainFriction;
-
-        p.terrainHitFraction = o[0].XterrainHitFraction;
-        p.terrainRestitution = o[0].XterrainRestitution;
-        p.terrainCollisionMargin = o[0].XterrainCollisionMargin;
-
-        p.avatarFriction = o[0].XavatarFriction;
-        p.avatarStandingFriction = o[0].XavatarStandingFriction;
-        p.avatarDensity = o[0].XavatarDensity;
-        p.avatarRestitution = o[0].XavatarRestitution;
-        p.avatarCapsuleWidth = o[0].XavatarCapsuleWidth;
-        p.avatarCapsuleDepth = o[0].XavatarCapsuleDepth;
-        p.avatarCapsuleHeight = o[0].XavatarCapsuleHeight;
-        p.avatarContactProcessingThreshold = o[0].XavatarContactProcessingThreshold;
+        p.linearDamping = BSParam.LinearDamping;
+        p.angularDamping = BSParam.AngularDamping;
+        p.deactivationTime = BSParam.DeactivationTime;
+        p.linearSleepingThreshold = BSParam.LinearSleepingThreshold;
+        p.angularSleepingThreshold = BSParam.AngularSleepingThreshold;
+        p.ccdMotionThreshold = BSParam.CcdMotionThreshold;
+        p.ccdSweptSphereRadius = BSParam.CcdSweptSphereRadius;
+        p.contactProcessingThreshold = BSParam.ContactProcessingThreshold;
+
+        p.terrainImplementation = BSParam.TerrainImplementation;
+        p.terrainFriction = BSParam.TerrainFriction;
+
+        p.terrainHitFraction = BSParam.TerrainHitFraction;
+        p.terrainRestitution = BSParam.TerrainRestitution;
+        p.terrainCollisionMargin = BSParam.TerrainCollisionMargin;
+
+        p.avatarFriction = BSParam.AvatarFriction;
+        p.avatarStandingFriction = BSParam.AvatarStandingFriction;
+        p.avatarDensity = BSParam.AvatarDensity;
+        p.avatarRestitution = BSParam.AvatarRestitution;
+        p.avatarCapsuleWidth = BSParam.AvatarCapsuleWidth;
+        p.avatarCapsuleDepth = BSParam.AvatarCapsuleDepth;
+        p.avatarCapsuleHeight = BSParam.AvatarCapsuleHeight;
+        p.avatarContactProcessingThreshold = BSParam.AvatarContactProcessingThreshold;
        
-        p.vehicleAngularDamping = o[0].XvehicleAngularDamping;
+        p.vehicleAngularDamping = BSParam.VehicleAngularDamping;
         
         p.maxPersistantManifoldPoolSize = o[0].maxPersistantManifoldPoolSize;
         p.maxCollisionAlgorithmPoolSize = o[0].maxCollisionAlgorithmPoolSize;
@@ -1132,15 +1132,15 @@ private sealed class BulletConstraintXNA : BulletConstraint
         p.shouldEnableFrictionCaching = o[0].shouldEnableFrictionCaching;
         p.numberOfSolverIterations = o[0].numberOfSolverIterations;
 
-        p.linksetImplementation = o[0].XlinksetImplementation;
-        p.linkConstraintUseFrameOffset = o[0].XlinkConstraintUseFrameOffset;
-        p.linkConstraintEnableTransMotor = o[0].XlinkConstraintEnableTransMotor;
-        p.linkConstraintTransMotorMaxVel = o[0].XlinkConstraintTransMotorMaxVel;
-        p.linkConstraintTransMotorMaxForce = o[0].XlinkConstraintTransMotorMaxForce;
-        p.linkConstraintERP = o[0].XlinkConstraintERP;
-        p.linkConstraintCFM = o[0].XlinkConstraintCFM;
-        p.linkConstraintSolverIterations = o[0].XlinkConstraintSolverIterations;
-        p.physicsLoggingFrames = o[0].XphysicsLoggingFrames;
+        p.linksetImplementation = BSParam.LinksetImplementation;
+        p.linkConstraintUseFrameOffset = BSParam.LinkConstraintUseFrameOffset;
+        p.linkConstraintEnableTransMotor = BSParam.LinkConstraintEnableTransMotor;
+        p.linkConstraintTransMotorMaxVel = BSParam.LinkConstraintTransMotorMaxVel;
+        p.linkConstraintTransMotorMaxForce = BSParam.LinkConstraintTransMotorMaxForce;
+        p.linkConstraintERP = BSParam.LinkConstraintERP;
+        p.linkConstraintCFM = BSParam.LinkConstraintCFM;
+        p.linkConstraintSolverIterations = BSParam.LinkConstraintSolverIterations;
+        p.physicsLoggingFrames = o[0].physicsLoggingFrames;
         DefaultCollisionConstructionInfo ccci = new DefaultCollisionConstructionInfo();
         
         DefaultCollisionConfiguration cci = new DefaultCollisionConfiguration();
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSApiTemplate.cs b/OpenSim/Region/Physics/BulletSPlugin/BSApiTemplate.cs
index abbd22c..5e06c1e 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSApiTemplate.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSApiTemplate.cs
@@ -174,32 +174,6 @@ public struct ConfigurationParameters
     public float collisionMargin;
     public float gravity;
 
-    public float XlinearDamping;
-    public float XangularDamping;
-    public float XdeactivationTime;
-    public float XlinearSleepingThreshold;
-    public float XangularSleepingThreshold;
-        public float XccdMotionThreshold;
-        public float XccdSweptSphereRadius;
-    public float XcontactProcessingThreshold;
-
-    public float XterrainImplementation;
-    public float XterrainFriction;
-    public float XterrainHitFraction;
-    public float XterrainRestitution;
-    public float XterrainCollisionMargin;
-
-    public float XavatarFriction;
-    public float XavatarStandingFriction;
-    public float XavatarDensity;
-    public float XavatarRestitution;
-    public float XavatarCapsuleWidth;
-    public float XavatarCapsuleDepth;
-    public float XavatarCapsuleHeight;
-        public float XavatarContactProcessingThreshold;
-
-    public float XvehicleAngularDamping;
-
         public float maxPersistantManifoldPoolSize;
         public float maxCollisionAlgorithmPoolSize;
         public float shouldDisableContactPoolDynamicAllocation;
@@ -208,17 +182,9 @@ public struct ConfigurationParameters
         public float shouldSplitSimulationIslands;
         public float shouldEnableFrictionCaching;
         public float numberOfSolverIterations;
+    public float useSingleSidedMeshes;
 
-    public float XlinksetImplementation;
-    public float XlinkConstraintUseFrameOffset;
-    public float XlinkConstraintEnableTransMotor;
-    public float XlinkConstraintTransMotorMaxVel;
-    public float XlinkConstraintTransMotorMaxForce;
-    public float XlinkConstraintERP;
-    public float XlinkConstraintCFM;
-    public float XlinkConstraintSolverIterations;
-
-    public float XphysicsLoggingFrames;
+    public float physicsLoggingFrames;
 
     public const float numericTrue = 1f;
     public const float numericFalse = 0f;
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
index 8c098b2..fbef7e7 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
@@ -68,6 +68,24 @@ public static class BSParam
     public static float TerrainRestitution { get; private set; }
     public static float TerrainCollisionMargin { get; private set; }
 
+    public static float DefaultFriction;
+    public static float DefaultDensity;
+    public static float DefaultRestitution;
+    public static float CollisionMargin;
+    public static float Gravity;
+
+    // Physics Engine operation
+        public static float MaxPersistantManifoldPoolSize;
+        public static float MaxCollisionAlgorithmPoolSize;
+        public static float ShouldDisableContactPoolDynamicAllocation;
+        public static float ShouldForceUpdateAllAabbs;
+        public static float ShouldRandomizeSolverOrder;
+        public static float ShouldSplitSimulationIslands;
+        public static float ShouldEnableFrictionCaching;
+        public static float NumberOfSolverIterations;
+    public static bool UseSingleSidedMeshes { get { return UseSingleSidedMeshesF != ConfigurationParameters.numericFalse; } }
+    public static float UseSingleSidedMeshesF;
+
     // Avatar parameters
     public static float AvatarFriction { get; private set; }
     public static float AvatarStandingFriction { get; private set; }
@@ -287,29 +305,29 @@ public static class BSParam
 
         new ParameterDefn("DefaultFriction", "Friction factor used on new objects",
             0.2f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].defaultFriction = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].defaultFriction; },
-            (s,p,l,v) => { s.UnmanagedParams[0].defaultFriction = v; } ),
+            (s,cf,p,v) => { DefaultFriction = cf.GetFloat(p, v); },
+            (s) => { return DefaultFriction; },
+            (s,p,l,v) => { DefaultFriction = v; s.UnmanagedParams[0].defaultFriction = v; } ),
         new ParameterDefn("DefaultDensity", "Density for new objects" ,
             10.000006836f,  // Aluminum g/cm3
-            (s,cf,p,v) => { s.UnmanagedParams[0].defaultDensity = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].defaultDensity; },
-            (s,p,l,v) => { s.UnmanagedParams[0].defaultDensity = v; } ),
+            (s,cf,p,v) => { DefaultDensity = cf.GetFloat(p, v); },
+            (s) => { return DefaultDensity; },
+            (s,p,l,v) => { DefaultDensity = v; s.UnmanagedParams[0].defaultDensity = v; } ),
         new ParameterDefn("DefaultRestitution", "Bouncyness of an object" ,
             0f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].defaultRestitution = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].defaultRestitution; },
-            (s,p,l,v) => { s.UnmanagedParams[0].defaultRestitution = v; } ),
+            (s,cf,p,v) => { DefaultRestitution = cf.GetFloat(p, v); },
+            (s) => { return DefaultRestitution; },
+            (s,p,l,v) => { DefaultRestitution = v; s.UnmanagedParams[0].defaultRestitution = v; } ),
         new ParameterDefn("CollisionMargin", "Margin around objects before collisions are calculated (must be zero!)",
             0.04f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].collisionMargin = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].collisionMargin; },
-            (s,p,l,v) => { s.UnmanagedParams[0].collisionMargin = v; } ),
+            (s,cf,p,v) => { CollisionMargin = cf.GetFloat(p, v); },
+            (s) => { return CollisionMargin; },
+            (s,p,l,v) => { CollisionMargin = v; s.UnmanagedParams[0].collisionMargin = v; } ),
         new ParameterDefn("Gravity", "Vertical force of gravity (negative means down)",
             -9.80665f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].gravity = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].gravity; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{s.UnmanagedParams[0].gravity=x;}, p, PhysParameterEntry.APPLY_TO_NONE, v); },
+            (s,cf,p,v) => { Gravity = cf.GetFloat(p, v); },
+            (s) => { return Gravity; },
+            (s,p,l,v) => { Gravity = v; s.UnmanagedParams[0].gravity = v; },
             (s,o,v) => { s.PE.SetGravity(o.PhysBody, new Vector3(0f,0f,v)); } ),
 
 
@@ -317,49 +335,49 @@ public static class BSParam
             0f,
             (s,cf,p,v) => { LinearDamping = cf.GetFloat(p, v); },
             (s) => { return LinearDamping; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{LinearDamping=x;}, p, l, v); },
+            (s,p,l,v) => { LinearDamping = v; },
             (s,o,v) => { s.PE.SetDamping(o.PhysBody, v, AngularDamping); } ),
         new ParameterDefn("AngularDamping", "Factor to damp angular movement per second (0.0 - 1.0)",
             0f,
             (s,cf,p,v) => { AngularDamping = cf.GetFloat(p, v); },
             (s) => { return AngularDamping; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AngularDamping=x;}, p, l, v); },
+            (s,p,l,v) => { AngularDamping = v; },
             (s,o,v) => { s.PE.SetDamping(o.PhysBody, LinearDamping, v); } ),
         new ParameterDefn("DeactivationTime", "Seconds before considering an object potentially static",
             0.2f,
             (s,cf,p,v) => { DeactivationTime = cf.GetFloat(p, v); },
             (s) => { return DeactivationTime; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{DeactivationTime=x;}, p, l, v); },
+            (s,p,l,v) => { DeactivationTime = v; },
             (s,o,v) => { s.PE.SetDeactivationTime(o.PhysBody, v); } ),
         new ParameterDefn("LinearSleepingThreshold", "Seconds to measure linear movement before considering static",
             0.8f,
             (s,cf,p,v) => { LinearSleepingThreshold = cf.GetFloat(p, v); },
             (s) => { return LinearSleepingThreshold; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{LinearSleepingThreshold=x;}, p, l, v); },
+            (s,p,l,v) => { LinearSleepingThreshold = v;},
             (s,o,v) => { s.PE.SetSleepingThresholds(o.PhysBody, v, v); } ),
         new ParameterDefn("AngularSleepingThreshold", "Seconds to measure angular movement before considering static",
             1.0f,
             (s,cf,p,v) => { AngularSleepingThreshold = cf.GetFloat(p, v); },
             (s) => { return AngularSleepingThreshold; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AngularSleepingThreshold=x;}, p, l, v); },
+            (s,p,l,v) => { AngularSleepingThreshold = v;},
             (s,o,v) => { s.PE.SetSleepingThresholds(o.PhysBody, v, v); } ),
         new ParameterDefn("CcdMotionThreshold", "Continuious collision detection threshold (0 means no CCD)" ,
             0.0f,     // set to zero to disable
             (s,cf,p,v) => { CcdMotionThreshold = cf.GetFloat(p, v); },
             (s) => { return CcdMotionThreshold; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{CcdMotionThreshold=x;}, p, l, v); },
+            (s,p,l,v) => { CcdMotionThreshold = v;},
             (s,o,v) => { s.PE.SetCcdMotionThreshold(o.PhysBody, v); } ),
         new ParameterDefn("CcdSweptSphereRadius", "Continuious collision detection test radius" ,
             0.2f,
             (s,cf,p,v) => { CcdSweptSphereRadius = cf.GetFloat(p, v); },
             (s) => { return CcdSweptSphereRadius; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{CcdSweptSphereRadius=x;}, p, l, v); },
+            (s,p,l,v) => { CcdSweptSphereRadius = v;},
             (s,o,v) => { s.PE.SetCcdSweptSphereRadius(o.PhysBody, v); } ),
         new ParameterDefn("ContactProcessingThreshold", "Distance above which contacts can be discarded (0 means no discard)" ,
             0.0f,
             (s,cf,p,v) => { ContactProcessingThreshold = cf.GetFloat(p, v); },
             (s) => { return ContactProcessingThreshold; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{ContactProcessingThreshold=x;}, p, l, v); },
+            (s,p,l,v) => { ContactProcessingThreshold = v;},
             (s,o,v) => { s.PE.SetContactProcessingThreshold(o.PhysBody, v); } ),
 
             new ParameterDefn("TerrainImplementation", "Type of shape to use for terrain (0=heightmap, 1=mesh)",
@@ -392,7 +410,7 @@ public static class BSParam
             0.2f,
             (s,cf,p,v) => { AvatarFriction = cf.GetFloat(p, v); },
             (s) => { return AvatarFriction; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarFriction=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarFriction = v; } ),
         new ParameterDefn("AvatarStandingFriction", "Avatar friction when standing. Changed on avatar recreation.",
             10.0f,
             (s,cf,p,v) => { AvatarStandingFriction = cf.GetFloat(p, v); },
@@ -407,32 +425,32 @@ public static class BSParam
             3.5f,
             (s,cf,p,v) => { AvatarDensity = cf.GetFloat(p, v); },
             (s) => { return AvatarDensity; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarDensity=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarDensity = v; } ),
         new ParameterDefn("AvatarRestitution", "Bouncyness. Changed on avatar recreation.",
             0f,
             (s,cf,p,v) => { AvatarRestitution = cf.GetFloat(p, v); },
             (s) => { return AvatarRestitution; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarRestitution=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarRestitution = v; } ),
         new ParameterDefn("AvatarCapsuleWidth", "The distance between the sides of the avatar capsule",
             0.6f,
             (s,cf,p,v) => { AvatarCapsuleWidth = cf.GetFloat(p, v); },
             (s) => { return AvatarCapsuleWidth; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarCapsuleWidth=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarCapsuleWidth = v; } ),
         new ParameterDefn("AvatarCapsuleDepth", "The distance between the front and back of the avatar capsule",
             0.45f,
             (s,cf,p,v) => { AvatarCapsuleDepth = cf.GetFloat(p, v); },
             (s) => { return AvatarCapsuleDepth; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarCapsuleDepth=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarCapsuleDepth = v; } ),
         new ParameterDefn("AvatarCapsuleHeight", "Default height of space around avatar",
             1.5f,
             (s,cf,p,v) => { AvatarCapsuleHeight = cf.GetFloat(p, v); },
             (s) => { return AvatarCapsuleHeight; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarCapsuleHeight=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarCapsuleHeight = v; } ),
             new ParameterDefn("AvatarContactProcessingThreshold", "Distance from capsule to check for collisions",
             0.1f,
             (s,cf,p,v) => { AvatarContactProcessingThreshold = cf.GetFloat(p, v); },
             (s) => { return AvatarContactProcessingThreshold; },
-            (s,p,l,v) => { s.UpdateParameterObject((x)=>{AvatarContactProcessingThreshold=x;}, p, l, v); } ),
+            (s,p,l,v) => { AvatarContactProcessingThreshold = v; } ),
             new ParameterDefn("AvatarStepHeight", "Height of a step obstacle to consider step correction",
             0.3f,
             (s,cf,p,v) => { AvatarStepHeight = cf.GetFloat(p, v); },
@@ -497,44 +515,49 @@ public static class BSParam
 
             new ParameterDefn("MaxPersistantManifoldPoolSize", "Number of manifolds pooled (0 means default of 4096)",
             0f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].maxPersistantManifoldPoolSize = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].maxPersistantManifoldPoolSize; },
-            (s,p,l,v) => { s.UnmanagedParams[0].maxPersistantManifoldPoolSize = v; } ),
+            (s,cf,p,v) => { MaxPersistantManifoldPoolSize = cf.GetFloat(p, v); },
+            (s) => { return MaxPersistantManifoldPoolSize; },
+            (s,p,l,v) => { MaxPersistantManifoldPoolSize = v; s.UnmanagedParams[0].maxPersistantManifoldPoolSize = v; } ),
             new ParameterDefn("MaxCollisionAlgorithmPoolSize", "Number of collisions pooled (0 means default of 4096)",
             0f,
-            (s,cf,p,v) => { s.UnmanagedParams[0].maxCollisionAlgorithmPoolSize = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].maxCollisionAlgorithmPoolSize; },
-            (s,p,l,v) => { s.UnmanagedParams[0].maxCollisionAlgorithmPoolSize = v; } ),
+            (s,cf,p,v) => { MaxCollisionAlgorithmPoolSize = cf.GetFloat(p, v); },
+            (s) => { return MaxCollisionAlgorithmPoolSize; },
+            (s,p,l,v) => { MaxCollisionAlgorithmPoolSize = v; s.UnmanagedParams[0].maxCollisionAlgorithmPoolSize = v; } ),
             new ParameterDefn("ShouldDisableContactPoolDynamicAllocation", "Enable to allow large changes in object count",
             ConfigurationParameters.numericFalse,
-            (s,cf,p,v) => { s.UnmanagedParams[0].shouldDisableContactPoolDynamicAllocation = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
-            (s) => { return s.UnmanagedParams[0].shouldDisableContactPoolDynamicAllocation; },
-            (s,p,l,v) => { s.UnmanagedParams[0].shouldDisableContactPoolDynamicAllocation = v; } ),
+            (s,cf,p,v) => { ShouldDisableContactPoolDynamicAllocation = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return ShouldDisableContactPoolDynamicAllocation; },
+            (s,p,l,v) => { ShouldDisableContactPoolDynamicAllocation = v; s.UnmanagedParams[0].shouldDisableContactPoolDynamicAllocation = v; } ),
             new ParameterDefn("ShouldForceUpdateAllAabbs", "Enable to recomputer AABBs every simulator step",
             ConfigurationParameters.numericFalse,
-            (s,cf,p,v) => { s.UnmanagedParams[0].shouldForceUpdateAllAabbs = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
-            (s) => { return s.UnmanagedParams[0].shouldForceUpdateAllAabbs; },
-            (s,p,l,v) => { s.UnmanagedParams[0].shouldForceUpdateAllAabbs = v; } ),
+            (s,cf,p,v) => { ShouldForceUpdateAllAabbs = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return ShouldForceUpdateAllAabbs; },
+            (s,p,l,v) => { ShouldForceUpdateAllAabbs = v; s.UnmanagedParams[0].shouldForceUpdateAllAabbs = v; } ),
             new ParameterDefn("ShouldRandomizeSolverOrder", "Enable for slightly better stacking interaction",
             ConfigurationParameters.numericTrue,
-            (s,cf,p,v) => { s.UnmanagedParams[0].shouldRandomizeSolverOrder = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
-            (s) => { return s.UnmanagedParams[0].shouldRandomizeSolverOrder; },
-            (s,p,l,v) => { s.UnmanagedParams[0].shouldRandomizeSolverOrder = v; } ),
+            (s,cf,p,v) => { ShouldRandomizeSolverOrder = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return ShouldRandomizeSolverOrder; },
+            (s,p,l,v) => { ShouldRandomizeSolverOrder = v; s.UnmanagedParams[0].shouldRandomizeSolverOrder = v; } ),
             new ParameterDefn("ShouldSplitSimulationIslands", "Enable splitting active object scanning islands",
             ConfigurationParameters.numericTrue,
-            (s,cf,p,v) => { s.UnmanagedParams[0].shouldSplitSimulationIslands = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
-            (s) => { return s.UnmanagedParams[0].shouldSplitSimulationIslands; },
-            (s,p,l,v) => { s.UnmanagedParams[0].shouldSplitSimulationIslands = v; } ),
+            (s,cf,p,v) => { ShouldSplitSimulationIslands = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return ShouldSplitSimulationIslands; },
+            (s,p,l,v) => { ShouldSplitSimulationIslands = v; s.UnmanagedParams[0].shouldSplitSimulationIslands = v; } ),
             new ParameterDefn("ShouldEnableFrictionCaching", "Enable friction computation caching",
             ConfigurationParameters.numericTrue,
-            (s,cf,p,v) => { s.UnmanagedParams[0].shouldEnableFrictionCaching = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
-            (s) => { return s.UnmanagedParams[0].shouldEnableFrictionCaching; },
-            (s,p,l,v) => { s.UnmanagedParams[0].shouldEnableFrictionCaching = v; } ),
+            (s,cf,p,v) => { ShouldEnableFrictionCaching = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return ShouldEnableFrictionCaching; },
+            (s,p,l,v) => { ShouldEnableFrictionCaching = v; s.UnmanagedParams[0].shouldEnableFrictionCaching = v; } ),
             new ParameterDefn("NumberOfSolverIterations", "Number of internal iterations (0 means default)",
             0f,     // zero says use Bullet default
-            (s,cf,p,v) => { s.UnmanagedParams[0].numberOfSolverIterations = cf.GetFloat(p, v); },
-            (s) => { return s.UnmanagedParams[0].numberOfSolverIterations; },
-            (s,p,l,v) => { s.UnmanagedParams[0].numberOfSolverIterations = v; } ),
+            (s,cf,p,v) => { NumberOfSolverIterations = cf.GetFloat(p, v); },
+            (s) => { return NumberOfSolverIterations; },
+            (s,p,l,v) => { NumberOfSolverIterations = v; s.UnmanagedParams[0].numberOfSolverIterations = v; } ),
+            new ParameterDefn("UseSingleSidedMeshes", "Whether to compute collisions based on single sided meshes.",
+            ConfigurationParameters.numericTrue,
+            (s,cf,p,v) => { UseSingleSidedMeshesF = BSParam.NumericBool(cf.GetBoolean(p, BSParam.BoolNumeric(v))); },
+            (s) => { return UseSingleSidedMeshesF; },
+            (s,p,l,v) => { UseSingleSidedMeshesF = v; s.UnmanagedParams[0].useSingleSidedMeshes = v; } ),
 
             new ParameterDefn("LinksetImplementation", "Type of linkset implementation (0=Constraint, 1=Compound, 2=Manual)",
             (float)BSLinkset.LinksetImplementation.Compound,
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
index a4690ba..6cd72f2 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
@@ -882,41 +882,41 @@ public sealed class BSScene : PhysicsScene, IPhysicsParameters
         BSParam.ParameterDefn theParam;
         if (BSParam.TryGetParameter(parm, out theParam))
         {
+            // Set the value in the C# code
             theParam.setter(this, parm, localID, val);
+
+            // Optionally set the parameter in the unmanaged code
+            if (theParam.onObject != null)
+            {
+                // update all the localIDs specified
+                // If the local ID is APPLY_TO_NONE, just change the default value
+                // If the localID is APPLY_TO_ALL change the default value and apply the new value to all the lIDs
+                // If the localID is a specific object, apply the parameter change to only that object
+                List<uint> objectIDs = new List<uint>();
+                switch (localID)
+                {
+                    case PhysParameterEntry.APPLY_TO_NONE:
+                        // This will cause a call into the physical world if some operation is specified (SetOnObject).
+                        objectIDs.Add(TERRAIN_ID);
+                        TaintedUpdateParameter(parm, objectIDs, val);
+                        break;
+                    case PhysParameterEntry.APPLY_TO_ALL:
+                        lock (PhysObjects) objectIDs = new List<uint>(PhysObjects.Keys);
+                        TaintedUpdateParameter(parm, objectIDs, val);
+                        break;
+                    default:
+                        // setting only one localID
+                        objectIDs.Add(localID);
+                        TaintedUpdateParameter(parm, objectIDs, val);
+                        break;
+                }
+            }
+
             ret = true;
         }
         return ret;
     }
 
-    // update all the localIDs specified
-    // If the local ID is APPLY_TO_NONE, just change the default value
-    // If the localID is APPLY_TO_ALL change the default value and apply the new value to all the lIDs
-    // If the localID is a specific object, apply the parameter change to only that object
-    internal delegate void AssignVal(float x);
-    internal void UpdateParameterObject(AssignVal setDefault, string parm, uint localID, float val)
-    {
-        List<uint> objectIDs = new List<uint>();
-        switch (localID)
-        {
-            case PhysParameterEntry.APPLY_TO_NONE:
-                setDefault(val);            // setting only the default value
-                // This will cause a call into the physical world if some operation is specified (SetOnObject).
-                objectIDs.Add(TERRAIN_ID);
-                TaintedUpdateParameter(parm, objectIDs, val);
-                break;
-            case PhysParameterEntry.APPLY_TO_ALL:
-                setDefault(val);  // setting ALL also sets the default value
-                lock (PhysObjects) objectIDs = new List<uint>(PhysObjects.Keys);
-                TaintedUpdateParameter(parm, objectIDs, val);
-                break;
-            default:
-                // setting only one localID
-                objectIDs.Add(localID);
-                TaintedUpdateParameter(parm, objectIDs, val);
-                break;
-        }
-    }
-
     // schedule the actual updating of the paramter to when the phys engine is not busy
     private void TaintedUpdateParameter(string parm, List<uint> lIDs, float val)
     {
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainMesh.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainMesh.cs
index 8244f02..d7e800d 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainMesh.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainMesh.cs
@@ -96,7 +96,7 @@ public sealed class BSTerrainMesh : BSTerrainPhys
         {
             // DISASTER!!
             PhysicsScene.DetailLog("{0},BSTerrainMesh.create,failedCreationOfShape", ID);
-            physicsScene.Logger.ErrorFormat("{0} Failed creation of terrain mesh! base={1}", LogHeader, TerrainBase);
+            PhysicsScene.Logger.ErrorFormat("{0} Failed creation of terrain mesh! base={1}", LogHeader, TerrainBase);
             // Something is very messed up and a crash is in our future.
             return;
         }
@@ -108,7 +108,7 @@ public sealed class BSTerrainMesh : BSTerrainPhys
         if (!m_terrainBody.HasPhysicalBody)
         {
             // DISASTER!!
-            physicsScene.Logger.ErrorFormat("{0} Failed creation of terrain body! base={1}", LogHeader, TerrainBase);
+            PhysicsScene.Logger.ErrorFormat("{0} Failed creation of terrain body! base={1}", LogHeader, TerrainBase);
             // Something is very messed up and a crash is in our future.
             return;
         }
@@ -131,6 +131,12 @@ public sealed class BSTerrainMesh : BSTerrainPhys
         m_terrainBody.collisionType = CollisionType.Terrain;
         m_terrainBody.ApplyCollisionMask(PhysicsScene);
 
+        if (BSParam.UseSingleSidedMeshes)
+        {
+            PhysicsScene.DetailLog("{0},BSTerrainMesh.settingCustomMaterial", id);
+            PhysicsScene.PE.AddToCollisionFlags(m_terrainBody, CollisionFlags.CF_CUSTOM_MATERIAL_CALLBACK);
+        }
+
         // Make it so the terrain will not move or be considered for movement.
         PhysicsScene.PE.ForceActivationState(m_terrainBody, ActivationState.DISABLE_SIMULATION);
     }
@@ -176,8 +182,7 @@ public sealed class BSTerrainMesh : BSTerrainPhys
 
     // Convert the passed heightmap to mesh information suitable for CreateMeshShape2().
     // Return 'true' if successfully created.
-    public static bool ConvertHeightmapToMesh(
-                                BSScene physicsScene,
+    public static bool ConvertHeightmapToMesh( BSScene physicsScene,
                                 float[] heightMap, int sizeX, int sizeY,    // parameters of incoming heightmap
                                 float extentX, float extentY,               // zero based range for output vertices
                                 Vector3 extentBase,                         // base to be added to all vertices