From c92696286215ca8260fa80472e2678d0482553b7 Mon Sep 17 00:00:00 2001
From: Teravus Ovares
Date: Tue, 12 Feb 2008 00:01:55 +0000
Subject: * This resolves the null exceptions when a script is manipulating a
 physical object in ODE and you delete the object.  The script is still
 running and trying to add force, but the object reference is null.

---
 OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs | 12 +++++++++---
 OpenSim/Region/Physics/OdePlugin/ODEPrim.cs           |  2 ++
 OpenSim/Region/Physics/OdePlugin/OdePlugin.cs         |  3 ++-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs
index c94a57d..a745d9c 100644
--- a/OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs
@@ -580,11 +580,17 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void applyImpulse(PhysicsVector impulse)
         {
+            // We check if rootpart is null here because scripts don't delete if you delete the host.
+            // This means that unfortunately, we can pass a null physics actor to Simulate!
+            // Make sure we don't do that!
             SceneObjectPart rootpart = m_rootPart;
-            if (m_rootPart.PhysActor != null)
+            if (rootpart != null)
             {
-                m_rootPart.PhysActor.AddForce(impulse);
-                m_scene.PhysicsScene.AddPhysicsActorTaint(m_rootPart.PhysActor);
+                if (rootpart.PhysActor != null)
+                {
+                    rootpart.PhysActor.AddForce(impulse);
+                    m_scene.PhysicsScene.AddPhysicsActorTaint(rootpart.PhysActor);
+                }
             }
         }
 
diff --git a/OpenSim/Region/Physics/OdePlugin/ODEPrim.cs b/OpenSim/Region/Physics/OdePlugin/ODEPrim.cs
index adb53d2..12d7694 100644
--- a/OpenSim/Region/Physics/OdePlugin/ODEPrim.cs
+++ b/OpenSim/Region/Physics/OdePlugin/ODEPrim.cs
@@ -429,6 +429,7 @@ namespace OpenSim.Region.Physics.OdePlugin
 
         public void ProcessTaints(float timestep)
         {
+            System.Threading.Thread.Sleep(5);
             if (m_taintposition != _position)
                 Move(timestep);
 
@@ -712,6 +713,7 @@ namespace OpenSim.Region.Physics.OdePlugin
 
         public void changeAddForce(float timestamp)
         {
+            System.Threading.Thread.Sleep(2);
             lock (m_forcelist)
             {
                 //m_log.Info("[PHYSICS]: dequeing forcelist");
diff --git a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
index e58984b..f1d8232 100644
--- a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
+++ b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
@@ -639,6 +639,7 @@ namespace OpenSim.Region.Physics.OdePlugin
         {
             lock (OdeLock)
             {
+                System.Threading.Thread.Sleep(20);
                 if (prim.IsPhysical)
                 {
                     prim.disableBody();
@@ -733,7 +734,7 @@ namespace OpenSim.Region.Physics.OdePlugin
             // never be called if the prim is physical(active)
 
             // All physical prim end up in the root space
-
+            System.Threading.Thread.Sleep(20);
             if (currentspace != space)
             {
                 if (d.SpaceQuery(currentspace, geom) && currentspace != (IntPtr) 0)
-- 
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