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BUlletSim: move safeynet ground plane to lower altitude. Define new BulletSim 

parameter 'TerrainGroundPlane' which defaults to -500.

BulletSim had assumed altitudes never went negative but that is not true. The
ground plane is just a safety net so things wouldn't fall to infinity.
0.8.0.3
Robert Adams 2014-04-28 11:08:47 -07:00
parent cb8c3ba023
commit 63aea3a5f2
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
OpenSim/Region/Physics/BulletSPlugin/BSParam.cs
View File

@ -97,6 +97,7 @@ public static class BSParam
public static float TerrainImplementation { get; set; }
public static int TerrainMeshMagnification { get; private set; }
public static float TerrainGroundPlane { get; private set; }
public static float TerrainFriction { get; private set; }
public static float TerrainHitFraction { get; private set; }
public static float TerrainRestitution { get; private set; }
@ -544,6 +545,8 @@ public static class BSParam
(float)BSTerrainPhys.TerrainImplementation.Heightmap ),
new ParameterDefn<int>("TerrainMeshMagnification", "Number of times the 256x256 heightmap is multiplied to create the terrain mesh" ,
2 ),
new ParameterDefn<float>("TerrainGroundPlane", "Altitude of ground plane used to keep things from falling to infinity" ,
-500.0f ),
new ParameterDefn<float>("TerrainFriction", "Factor to reduce movement against terrain surface" ,
0.3f ),
new ParameterDefn<float>("TerrainHitFraction", "Distance to measure hit collisions" ,

5
OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
View File

@ -136,9 +136,10 @@ public sealed class BSTerrainManager : IDisposable
{
DetailLog("{0},BSTerrainManager.CreateInitialGroundPlaneAndTerrain,region={1}", BSScene.DetailLogZero, m_physicsScene.RegionName);
// The ground plane is here to catch things that are trying to drop to negative infinity
BulletShape groundPlaneShape = m_physicsScene.PE.CreateGroundPlaneShape(BSScene.GROUNDPLANE_ID, 1f, BSParam.TerrainCollisionMargin);
BulletShape groundPlaneShape = m_physicsScene.PE.CreateGroundPlaneShape(BSScene.GROUNDPLANE_ID, 1f, BSParam.TerrainCollisionMargin);
Vector3 groundPlaneAltitude = new Vector3(0f, 0f, BSParam.TerrainGroundPlane);
m_groundPlane = m_physicsScene.PE.CreateBodyWithDefaultMotionState(groundPlaneShape,
BSScene.GROUNDPLANE_ID, Vector3.Zero, Quaternion.Identity);
BSScene.GROUNDPLANE_ID, groundPlaneAltitude, Quaternion.Identity);
// Everything collides with the ground plane.
m_groundPlane.collisionType = CollisionType.Groundplane;