From 5bdfd55ace4b673d8aaa3f25fd4bb675b1b28263 Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Fri, 2 Aug 2013 10:32:43 -0700
Subject: BulletSim: When converting linkset types, don't try to change the
 list of linkset children while iterating through the list.

---
 .../Region/Physics/BulletSPlugin/BSPrimLinkable.cs | 29 +++++++++++++++-------
 1 file changed, 20 insertions(+), 9 deletions(-)

(limited to 'OpenSim/Region/Physics')

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs b/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
index c565998..7179a6d 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
@@ -240,26 +240,37 @@ public class BSPrimLinkable : BSPrimDisplaced
         bool ret = false;
         if (LinksetType != newType)
         {
-            BSLinkset oldLinkset = Linkset;
+            // Set the implementation type first so the call to BSLinkset.Factory gets the new type.
+            this.LinksetType = newType;
+
+            BSLinkset oldLinkset = this.Linkset;
             BSLinkset newLinkset = BSLinkset.Factory(PhysScene, this);
 
+            this.Linkset = newLinkset;
+
             // Pick up any physical dependencies this linkset might have in the physics engine.
             oldLinkset.RemoveDependencies(this);
 
-            // Copy the linkset children from the old linkset to the new (will be a new instance from the factory)
-            oldLinkset.ForEachLinkInfo((li) =>
+            // Create a list of the children (mainly because can't interate through a list that's changing)
+            List<BSPrimLinkable> children = new List<BSPrimLinkable>();
+            oldLinkset.ForEachMember((child) =>
             {
-                oldLinkset.RemoveMeFromLinkset(li.member);
-                newLinkset.AddMeToLinkset(li.member);
-                li.member.Linkset = newLinkset;
-                return false;
+                if (!oldLinkset.IsRoot(child))
+                    children.Add(child);
+                return false;   // 'false' says to continue to next member
             });
 
-            this.Linkset = newLinkset;
+            // Remove the children from the old linkset and add to the new (will be a new instance from the factory)
+            foreach (BSPrimLinkable child in children)
+            {
+                oldLinkset.RemoveMeFromLinkset(child);
+                newLinkset.AddMeToLinkset(child);
+                child.Linkset = newLinkset;
+            }
 
             // Force the shape and linkset to get reconstructed
             newLinkset.Refresh(this);
-            this.ForceBodyShapeRebuild(true);
+            this.ForceBodyShapeRebuild(true /* inTaintTime */);
         }
         return ret;
     }
-- 
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