BulletSim: Change defaults for constraint CFM and ERP to make large linksets more rigid. Remove mass calculation for terrain (it should stay a static object).

1 files changed, 6 insertions, 9 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
index 2808603..caf411e 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
@@ -114,6 +114,8 @@ public class BSTerrainManager
                         BulletSimAPI.CreateBodyWithDefaultMotionState2(groundPlaneShape.ptr, BSScene.GROUNDPLANE_ID,
                                                             Vector3.Zero, Quaternion.Identity));
         BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, m_groundPlane.ptr);
+        // Ground plane does not move
+        BulletSimAPI.ForceActivationState2(m_groundPlane.ptr, ActivationState.DISABLE_SIMULATION);
         // Everything collides with the ground plane.
         BulletSimAPI.SetCollisionFilterMask2(m_groundPlane.ptr,
                         (uint)CollisionFilterGroups.GroundPlaneFilter, (uint)CollisionFilterGroups.GroundPlaneMask);
@@ -296,16 +298,16 @@ public class BSTerrainManager
                     mapInfo.Ptr = BulletSimAPI.CreateHeightMapInfo2(PhysicsScene.World.ptr, mapInfo.ID,
                         mapInfo.minCoords, mapInfo.maxCoords, mapInfo.heightMap, TERRAIN_COLLISION_MARGIN);
 
+                    // Create the terrain shape from the mapInfo
+                    mapInfo.terrainShape = new BulletShape(BulletSimAPI.CreateTerrainShape2(mapInfo.Ptr),
+                                ShapeData.PhysicsShapeType.SHAPE_TERRAIN);
+
                     // The terrain object initial position is at the center of the object
                     Vector3 centerPos;
                     centerPos.X = minCoords.X + (mapInfo.sizeX / 2f);
                     centerPos.Y = minCoords.Y + (mapInfo.sizeY / 2f);
                     centerPos.Z = minZ + ((maxZ - minZ) / 2f);
 
-                    // Create the terrain shape from the mapInfo
-                    mapInfo.terrainShape = new BulletShape(BulletSimAPI.CreateTerrainShape2(mapInfo.Ptr),
-                                ShapeData.PhysicsShapeType.SHAPE_TERRAIN);
-
                     mapInfo.terrainBody = new BulletBody(mapInfo.ID,
                             BulletSimAPI.CreateBodyWithDefaultMotionState2(mapInfo.terrainShape.ptr,
                                                         id, centerPos, Quaternion.Identity));
@@ -320,11 +322,6 @@ public class BSTerrainManager
                 BulletSimAPI.SetRestitution2(mapInfo.terrainBody.ptr, PhysicsScene.Params.terrainRestitution);
                 BulletSimAPI.SetCollisionFlags2(mapInfo.terrainBody.ptr, CollisionFlags.CF_STATIC_OBJECT);
 
-                float terrainMass = 1000;
-                Vector3 localInertia = BulletSimAPI.CalculateLocalInertia2(mapInfo.terrainBody.ptr, terrainMass);
-                BulletSimAPI.SetMassProps2(mapInfo.terrainBody.ptr, terrainMass, localInertia);
-                BulletSimAPI.UpdateInertiaTensor2(mapInfo.terrainBody.ptr);
-
                 // Return the new terrain to the world of physical objects
                 BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, mapInfo.terrainBody.ptr);