BulletSim: fix race condition when creating very large mega-regions.

The symptom was exceptions while creating physical terrain.
Reduce default terrain mesh magnification to 2 from 3 because the
higher resolution uses a lot of memory and doesn't solve the terrain
smoothness for vehicles.
Added comments here and there and improved some debugging log messages.

1 files changed, 1 insertions, 1 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
index f3454c8..385ed9e 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
@@ -482,7 +482,7 @@ public static class BSParam
             (s) => { return TerrainImplementation; },
             (s,v) => { TerrainImplementation = v; } ),
         new ParameterDefn<int>("TerrainMeshMagnification", "Number of times the 256x256 heightmap is multiplied to create the terrain mesh" ,
-            3,
+            2,
             (s) => { return TerrainMeshMagnification; },
             (s,v) => { TerrainMeshMagnification = v; } ),
         new ParameterDefn<float>("TerrainFriction", "Factor to reduce movement against terrain surface" ,