--- trunk/NewtonPlugin/NewtonPrim.cs	2009/03/07 16:15:28	12
+++ trunk/NewtonPlugin/NewtonPrim.cs	2009/09/17 21:39:23	17
@@ -31,11 +31,14 @@
 using Nini.Config;
 using OpenSim.Framework;
 using OpenSim.Region.Physics.Manager;
+using System.Reflection;
+using log4net;
 
 namespace OpenSim.Region.Physics.NewtonPlugin
 {
     public class NewtonPrim : PhysicsActor
     {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
         private float _mass;
         private PhysicsVector _position;
         private PhysicsVector _velocity;
@@ -136,7 +139,10 @@
         public override PhysicsVector Position
         {
             get { return _position; }
-            set { _position = value; }
+            set { 
+                // m_log.InfoFormat("[NEWTONPRIM] Somebody set our position to {0}", value);
+                _position = value;
+            }
         }
 
         public override PhysicsVector Size
@@ -148,11 +154,22 @@
         public override float Mass
         {
             get { return _mass; }
+            // set {
+            //     m_log.InfoFormat("[NEWTONPRIM] Somebody tried to set mass to {0}, ignored.",
+            //                      value);
+            // }
         }
 
+        // We're the Physics Engine, we control mass!!!
+        //  (More to the point : I don't know how to ask        
+        //   for the out-of-engine mass, and it was getting
+        //   set after the object had been enabled physical,
+        //   which led to inconsistencies and scariness 
+        //   with AddForce)
+
         public void SetMass(float mass)
         {
-            _mass = mass;
+            // m_log.InfoFormat("[NEWTONPRIM] Somebody tried to set mass to {0}, ignored.",mass);
         }
 
         public override PhysicsVector Force
@@ -245,10 +262,12 @@
           set { _oldAcceleration = value; }
         }
 
+        // set commented out because PhysicsActor.Acceleration doesn't have
+        //   a set!
         public override PhysicsVector Acceleration
         {
             get { return _acceleration; }
- //           set { _acceleration = value; }
+            // set { _acceleration = value; }
         }
 
         public PhysicsVector Jerk 
@@ -332,6 +351,14 @@
 
         public override void AddForce(PhysicsVector force, bool pushforce)
         {
+            // I don't understand what pushforce is, so I'm going to
+            // ignore it for now...! (rknop 2009/09/14)
+
+            // m_log.InfoFormat("[NEWTONPRIM] Adding force {0} to prim at {1} with mass {2}",
+            //                  force, _position, _mass);
+            _velocity += force/_mass;
+            // m_log.InfoFormat("[NEWTONPRIM] When done : position = {0}, velocity={1}, acceleration={2}, jerk={3}",
+            //                  _position, _velocity, _acceleration, _jerk);
         }
 
         public override void AddAngularForce(PhysicsVector force, bool pushforce)