From 725751fd6c0101b8610e84716d28b6af91e20b61 Mon Sep 17 00:00:00 2001
From: Robert Adams
Date: Tue, 6 Aug 2013 10:32:56 -0700
Subject: BulletSim: fixes for change linkset implementation of physical
 linksets.

---
 .../Scripting/ExtendedPhysics/ExtendedPhysics.cs   | 29 +++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

(limited to 'OpenSim/Region/OptionalModules')

diff --git a/OpenSim/Region/OptionalModules/Scripting/ExtendedPhysics/ExtendedPhysics.cs b/OpenSim/Region/OptionalModules/Scripting/ExtendedPhysics/ExtendedPhysics.cs
index d1d318c..4455df4 100755
--- a/OpenSim/Region/OptionalModules/Scripting/ExtendedPhysics/ExtendedPhysics.cs
+++ b/OpenSim/Region/OptionalModules/Scripting/ExtendedPhysics/ExtendedPhysics.cs
@@ -29,6 +29,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using System.Text;
+using System.Threading;
 
 using OpenSim.Framework;
 using OpenSim.Region.CoreModules;
@@ -198,7 +199,33 @@ public class ExtendedPhysics : INonSharedRegionModule
                 Physics.Manager.PhysicsActor rootPhysActor = rootPart.PhysActor;
                 if (rootPhysActor != null)
                 {
-                    ret = (int)rootPhysActor.Extension(PhysFunctSetLinksetType, linksetType);
+                    if (rootPhysActor.IsPhysical)
+                    {
+                        // Change a physical linkset by making non-physical, waiting for one heartbeat so all
+                        //    the prim and linkset state is updated, changing the type and making the
+                        //    linkset physical again.
+                        containingGroup.ScriptSetPhysicsStatus(false);
+                        Thread.Sleep(150);  // longer than one heartbeat tick
+
+                        // A kludge for the moment.
+                        // Since compound linksets move the children but don't generate position updates to the
+                        //     simulator, it is possible for compound linkset children to have out-of-sync simulator
+                        //     and physical positions. The following causes the simulator to push the real child positions
+                        //     down into the physics engine to get everything synced.
+                        containingGroup.UpdateGroupPosition(containingGroup.AbsolutePosition);
+                        containingGroup.UpdateGroupRotationR(containingGroup.GroupRotation);
+
+                        ret = (int)rootPhysActor.Extension(PhysFunctSetLinksetType, linksetType);
+                        Thread.Sleep(150);  // longer than one heartbeat tick
+
+                        containingGroup.ScriptSetPhysicsStatus(true);
+                    }
+                    else
+                    {
+                        // Non-physical linksets don't have a physical instantiation so there is no state to
+                        //    worry about being updated.
+                        ret = (int)rootPhysActor.Extension(PhysFunctSetLinksetType, linksetType);
+                    }
                 }
                 else
                 {
-- 
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