BulletSim: fix density since the simulator/viewer track density in a

funny unit that is 100 times real density (default 1000).
Fix avatar drifting slowly when stationary flying.
Fix for physical prims getting corrected for being under terrain when it was
just its geometric center that was below terrain.
Add PreUpdatePropertyAction allowing plugable modifiction of phys
parameters returned from Bullet.
Fix an exception setting GravityMultiplier on initialization.
Update DLLs and SOs for good measure (no functional change).

1 files changed, 11 insertions, 2 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs b/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
index 04fb05b..8dca7c6 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
@@ -83,7 +83,7 @@ public sealed class BSCharacter : BSPhysObject
         _velocity = OMV.Vector3.Zero;
         _buoyancy = ComputeBuoyancyFromFlying(isFlying);
         Friction = BSParam.AvatarStandingFriction;
-        Density = BSParam.AvatarDensity;
+        Density = BSParam.AvatarDensity / BSParam.DensityScaleFactor;
 
         // Old versions of ScenePresence passed only the height. If width and/or depth are zero,
         //     replace with the default values.
@@ -231,6 +231,15 @@ public sealed class BSCharacter : BSPhysObject
                         PhysicsScene.PE.SetFriction(PhysBody, Friction);
                     }
                 }
+                else
+                {
+                    if (Flying)
+                    {
+                        // Flying and not collising and velocity nearly zero.
+                        ZeroMotion(true /* inTaintTime */);
+                    }
+                }
+
                 DetailLog("{0},BSCharacter.MoveMotor,taint,stopping,target={1},colliding={2}", LocalID, _velocityMotor.TargetValue, IsColliding);
             }
             else
@@ -869,7 +878,7 @@ public sealed class BSCharacter : BSPhysObject
                         * Math.Min(Size.X, Size.Y) / 2
                         * Size.Y / 2f    // plus the volume of the capsule end caps
                         );
-        _mass = Density * _avatarVolume;
+        _mass = Density * BSParam.DensityScaleFactor * _avatarVolume;
     }
 
     // The physics engine says that properties have updated. Update same and inform