BulletSim: Add one function that all actors who act on the physical

can use to know if the object is currently active.
Code cleaning including use of Util.ClampV function.

OpenSim/Region/Physics/BulletSPlugin/BSCharacter.cs

@@ -652,6 +652,9 @@ public sealed class BSCharacter : BSPhysObject
     public override bool IsStatic {
         get { return false; }
     }
+    public override bool IsPhysicallyActive {
+        get { return true; }
+    }
     public override bool Flying {
         get { return _flying; }
         set {

OpenSim/Region/Physics/BulletSPlugin/BSDynamics.cs

@@ -35,6 +35,7 @@ using System.Collections.Generic;
 using System.Reflection;
 using System.Runtime.InteropServices;
 using OpenMetaverse;
+using OpenSim.Framework;
 using OpenSim.Region.Physics.Manager;
 
 namespace OpenSim.Region.Physics.BulletSPlugin
@@ -154,7 +155,7 @@ namespace OpenSim.Region.Physics.BulletSPlugin
         // Return 'true' if this vehicle is doing vehicle things
         public bool IsActive
         {
-            get { return (Type != Vehicle.TYPE_NONE && !Prim.IsStatic); }
+            get { return (Type != Vehicle.TYPE_NONE && Prim.IsPhysicallyActive); }
         }
 
         #region Vehicle parameter setting

OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs

@@ -139,6 +139,11 @@ public abstract class BSPhysObject : PhysicsActor
     public abstract bool IsStatic { get; }
     public abstract bool IsSelected { get; }
 
+    // It can be confusing for an actor to know if it should move or update an object
+    //    depeneding on the setting of 'selected', 'physical, ...
+    // This flag is the true test -- if true, the object is being acted on in the physical world
+    public abstract bool IsPhysicallyActive { get; }
+
     // Materialness
     public MaterialAttributes.Material Material { get; private set; }
     public override void SetMaterial(int material)
@@ -302,8 +307,9 @@ public abstract class BSPhysObject : PhysicsActor
     public virtual bool SendCollisions()
     {
         bool ret = true;
+
         // If the 'no collision' call, force it to happen right now so quick collision_end
-        bool force = (CollisionCollection.Count == 0);
+        bool force = (CollisionCollection.Count == 0 && CollisionsLastTick.Count != 0);
 
         // throttle the collisions to the number of milliseconds specified in the subscription
         if (force || (PhysicsScene.SimulationNowTime >= NextCollisionOkTime))
@@ -318,7 +324,7 @@ public abstract class BSPhysObject : PhysicsActor
                 ret = false;
             }
 
-            // DetailLog("{0},{1}.SendCollisionUpdate,call,numCollisions={2}", LocalID, TypeName, CollisionCollection.Count);
+            DetailLog("{0},{1}.SendCollisionUpdate,call,numCollisions={2}", LocalID, TypeName, CollisionCollection.Count);
             base.SendCollisionUpdate(CollisionCollection);
 
             // Remember the collisions from this tick for some collision specific processing.

OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs

@@ -132,8 +132,8 @@ public sealed class BSPrim : BSPhysObject
         base.Destroy();
 
         // Undo any links between me and any other object
-        BSPhysObject parentBefore = Linkset.LinksetRoot;
+        BSPhysObject parentBefore = Linkset.LinksetRoot;    // DEBUG DEBUG
-        int childrenBefore = Linkset.NumberOfChildren;
+        int childrenBefore = Linkset.NumberOfChildren;      // DEBUG DEBUG
 
         Linkset = Linkset.RemoveMeFromLinkset(this);
 
@@ -727,6 +727,12 @@ public sealed class BSPrim : BSPhysObject
         get { return !IsPhantom && !_isVolumeDetect; }
     }
 
+    // The object is moving and is actively being dynamic in the physical world
+    public override bool IsPhysicallyActive
+    {
+        get { return !_isSelected && IsPhysical; }
+    }
+
     // Make gravity work if the object is physical and not selected
     // Called at taint-time!!
     private void SetObjectDynamic(bool forceRebuild)
@@ -1174,18 +1180,11 @@ public sealed class BSPrim : BSPhysObject
     // This added force will only last the next simulation tick.
     public void AddForce(OMV.Vector3 force, bool pushforce, bool inTaintTime) {
         // for an object, doesn't matter if force is a pushforce or not
-        if (!IsStatic)
+        if (IsPhysicallyActive)
         {
             if (force.IsFinite())
             {
-                float magnitude = force.Length();
+                OMV.Vector3 addForce = Util.ClampV(force, BSParam.MaxAddForceMagnitude);
-                if (magnitude > BSParam.MaxAddForceMagnitude)
-                {
-                    // Force has a limit
-                    force = force / magnitude * BSParam.MaxAddForceMagnitude;
-                }
-
-                OMV.Vector3 addForce = force;
                 // DetailLog("{0},BSPrim.addForce,call,force={1}", LocalID, addForce);
 
                 PhysicsScene.TaintedObject(inTaintTime, "BSPrim.AddForce", delegate()
@@ -1209,19 +1208,13 @@ public sealed class BSPrim : BSPhysObject
 
     public void AddForceImpulse(OMV.Vector3 impulse, bool pushforce, bool inTaintTime) {
         // for an object, doesn't matter if force is a pushforce or not
-        if (!IsStatic)
+        if (!IsPhysicallyActive)
         {
             if (impulse.IsFinite())
             {
-                float magnitude = impulse.Length();
+                OMV.Vector3 addImpulse = Util.ClampV(impulse, BSParam.MaxAddForceMagnitude);
-                if (magnitude > BSParam.MaxAddForceMagnitude)
-                {
-                    // Force has a limit
-                    impulse = impulse / magnitude * BSParam.MaxAddForceMagnitude;
-                }
-
                 // DetailLog("{0},BSPrim.addForceImpulse,call,impulse={1}", LocalID, impulse);
-                OMV.Vector3 addImpulse = impulse;
+
                 PhysicsScene.TaintedObject(inTaintTime, "BSPrim.AddImpulse", delegate()
                 {
                     // Bullet adds this impulse immediately to the velocity

OpenSim/Region/Physics/BulletSPlugin/BulletSimTODO.txt

@@ -16,6 +16,7 @@ vehicle angular banking
 Avatars walking up stairs (HALF DONE)
     Radius of the capsule affects ability to climb edges.
 Vehicle movement on terrain smoothness
+When is force introduced by SetForce removed? The prestep action could go forever.
 Boats float low in the water (DONE)
 Avatar movement
 	flying into a wall doesn't stop avatar who keeps appearing to move through the obstacle (DONE)
@@ -72,8 +73,11 @@ Incorporate inter-relationship of angular corrections. For instance, angularDefl
 
 GENERAL TODO LIST:
 =================================================
+Implement llSetPhysicalMaterial.
+Implement llSetForceAndTorque.
 Implement an avatar mesh shape. The Bullet capsule is way too limited.
 	Consider just hand creating a vertex/index array in a new BSShapeAvatar.
+Verify/fix phantom, volume-detect objects do not fall to infinity. Should stop at terrain.
 Revisit CollisionMargin. Builders notice the 0.04 spacing between prims.
 Duplicating a physical prim causes old prim to jump away
 	Dup a phys prim and the original become unselected and thus interacts w/ selected prim.