From cb2727cf6e7b40473d10cfbea61155f5bcf6646f Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Sun, 18 Mar 2012 11:53:53 -0700
Subject: BulletSim: Add AvatarRestitution parameter. Centralize computation of
 buoyancy for flying. Tweek avatar default friction and resititution

---
 OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs | 9 ++++++---
 OpenSim/Region/Physics/BulletSPlugin/BSScene.cs     | 3 +++
 bin/OpenSimDefaults.ini                             | 3 ++-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs b/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
index e816b61..1a61431 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs
@@ -94,7 +94,7 @@ public class BSCharacter : PhysicsActor
         _flying = isFlying;
         _orientation = Quaternion.Identity;
         _velocity = Vector3.Zero;
-        _buoyancy = isFlying ? 1f : 0f;
+        _buoyancy = ComputeBuoyancyFromFlying(isFlying);
         _scale = new Vector3(1f, 1f, 1f);
         _density = _scene.Params.avatarDensity;
         ComputeAvatarVolumeAndMass();   // set _avatarVolume and _mass based on capsule size, _density and _scale
@@ -110,7 +110,7 @@ public class BSCharacter : PhysicsActor
         shapeData.Buoyancy = _buoyancy;
         shapeData.Static = ShapeData.numericFalse;
         shapeData.Friction = _scene.Params.avatarFriction;
-        shapeData.Restitution = _scene.Params.defaultRestitution;
+        shapeData.Restitution = _scene.Params.avatarRestitution;
 
         // do actual create at taint time
         _scene.TaintedObject(delegate()
@@ -261,9 +261,12 @@ public class BSCharacter : PhysicsActor
         set {
             _flying = value;
             // simulate flying by changing the effect of gravity
-            this.Buoyancy(_flying ? 1f : 0f);
+            this.Buoyancy(ComputeBuoyancyFromFlying(_flying));
         } 
     }
+    private float ComputeBuoyancyFromFlying(bool ifFlying) {
+        return ifFlying ? 1f : 0f;
+    }
     public override bool 
         SetAlwaysRun { 
         get { return _setAlwaysRun; } 
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
index 977dcbe..9b12b4f 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
@@ -235,6 +235,7 @@ public class BSScene : PhysicsScene, IPhysicsParameters
         parms.terrainHitFraction = 0.8f;
         parms.terrainRestitution = 0f;
         parms.avatarFriction = 0.5f;
+        parms.avatarRestitution = 0.0f;
         parms.avatarDensity = 60f;
         parms.avatarCapsuleRadius = 0.37f;
         parms.avatarCapsuleHeight = 1.5f; // 2.140599f
@@ -279,7 +280,9 @@ public class BSScene : PhysicsScene, IPhysicsParameters
                 parms.terrainHitFraction = pConfig.GetFloat("TerrainHitFraction", parms.terrainHitFraction);
                 parms.terrainRestitution = pConfig.GetFloat("TerrainRestitution", parms.terrainRestitution);
                 parms.avatarFriction = pConfig.GetFloat("AvatarFriction", parms.avatarFriction);
+                parms.avatarRestitution = pConfig.GetFloat("AvatarRestitution", parms.avatarRestitution);
                 parms.avatarDensity = pConfig.GetFloat("AvatarDensity", parms.avatarDensity);
+                parms.avatarRestitution = pConfig.GetFloat("AvatarRestitution", parms.avatarRestitution);
                 parms.avatarCapsuleRadius = pConfig.GetFloat("AvatarCapsuleRadius", parms.avatarCapsuleRadius);
                 parms.avatarCapsuleHeight = pConfig.GetFloat("AvatarCapsuleHeight", parms.avatarCapsuleHeight);
             }
diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index d291cfb..2f4a549 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -833,7 +833,8 @@
     TerrainFriction = 0.50
     TerrainHitFriction = 0.8
     TerrainRestitution = 0
-    AvatarFriction = 0.5
+    AvatarFriction = 0.2
+    AvatarRestitution = 0.0
     AvatarDensity = 60.0
     AvatarCapsuleRadius = 0.37
     AvatarCapsuleHeight = 1.5
-- 
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