BulletSim: remove unuseful BulletSim parameters from OpenSimDefaults.ini and

replace with things someone might actually want to tune (avatar height, ...).

bin/OpenSimDefaults.ini

@@ -921,56 +921,49 @@
     ;force_simple_prim_meshing = true
 
 [BulletSim]
-    ; World parameters
+    ; All the BulletSim parameters can be displayed with the console command "physics get all"
+    ;    and all are defined in the source file OpenSim/Regions/Physics/BulletSPlugin/BSParam.cs.
 
     ; There are two bullet physics libraries, bulletunmanaged is the default and is a native c++ dll
-    ; bulletxna is a managed C# dll.  They have comparible functionality..   the c++ is much faster.
-
+    ; bulletxna is a managed C# dll.  They have comparible functionality but the c++ one is much faster.
     BulletEngine = "bulletunmanaged"
     ; BulletEngine = "bulletxna"
 
-    ; Terrain Implementation {1|0} 0 for HeightField, 1 for Mesh terrain.  If you're using the bulletxna engine, 
-    ;  you will want to switch to the heightfield option
-    TerrainImplementation = 1
-    ; TerrainImplementation = 0
+    ; Terrain Implementation
+    TerrainImplementation = 1   ; 0=Heightfield, 1=mesh
+    ; For mesh terrain, the detail of the created mesh. '1' gives 256x256 (heightfield resolution). '2'
+    ;    gives 512x512. Etc. Cannot be larger than '4'. Higher magnification uses lots of memory.
+    TerrainMeshMagnification = 2
 
-    Gravity = -9.80665
+    ; Avatar physics height adjustments. http://opensimulator.org/wiki/BulletSim#Adjusting_Avatar_Height
+    AvatarHeightLowFudge = -0.2     ; Adjustment at low end of height range
+    AvatarHeightMidFudge = 0.1      ; Adjustment at mid point of avatar height range
+    AvatarHeightHighFudge = 0.1     ; Adjustment at high end of height range
 
-    TerrainFriction = 0.30
-    TerrainHitFraction = 0.8
-    TerrainRestitution = 0
-    TerrainCollisionMargin = 0.04
-
-    AvatarFriction = 0.2
-    AvatarStandingFriction = 0.95
-    AvatarRestitution = 0.0
-    AvatarDensity = 3.5
-    AvatarCapsuleWidth = 0.6
-    AvatarCapsuleDepth = 0.45
-    AvatarCapsuleHeight = 1.5
-    AvatarContactProcessingThreshold = 0.1
-
-    MaxObjectMass = 10000.01
-
-    CollisionMargin = 0.04
-
-    ; Linkset implmentation
+    ; Default linkset implmentation
+    ; 'Constraint' uses physics constraints to hold linkset together. 'Compound' builds a compound
+    ;     shape from the children shapes to create a single physical shape. 'Compound' uses a lot less CPU time.
     LinkImplementation = 1      ; 0=constraint, 1=compound
 
-    ; Whether to mesh sculpties
+    ; If 'true', turn scuplties into meshes
     MeshSculptedPrim = true
 
     ; If 'true', force simple prims (box and sphere) to be meshed
+    ; If 'false', the Bullet native special case shape is used for square rectangles and even dimensioned spheres
     ForceSimplePrimMeshing = false
 
-    ; Bullet step parameters
-    MaxSubSteps = 10
-    FixedTimeStep = .01667
+    ; If 'true', when creating meshes, remove all triangles that have two equal vertexes.
+    ;    Happens often in sculpties. If turned off, there will be some doorways that cannot be walked through.
+    ShouldRemoveZeroWidthTriangles = true
 
+    ; If 'true', use convex hull definition in mesh asset if present.
+    ShouldUseAssetHulls = true
+
+    ; If there are thousands of physical objects, these maximums should be increased.
     MaxCollisionsPerFrame = 2048
     MaxUpdatesPerFrame = 8192
 
-    ; Detailed physics debug logging
+    ; Detailed physics debug logging. Very verbose.
     PhysicsLoggingEnabled = False
     PhysicsLoggingDir = "."
     VehicleLoggingEnabled = False