/// <summary>
/// Link the prims in a given group to this group
/// </summary>
/// <param name="objectGroup">The group of prims which should be linked to this group</param>
public void LinkToGroup(SceneObjectGroup objectGroup)
{
//m_log.DebugFormat(
// "[SCENE OBJECT GROUP]: Linking group with root part {0}, {1} to group with root part {2}, {3}",
// objectGroup.RootPart.Name, objectGroup.RootPart.UUID, RootPart.Name, RootPart.UUID);
//Clear the update schedule so that we don't send wrong updates later about how this group is set up
objectGroup.RootPart.ClearUpdateScheduleOnce();
SceneObjectPart linkPart = objectGroup.m_rootPart;
Vector3 oldGroupPosition = linkPart.GroupPosition;
Quaternion oldRootRotation = linkPart.RotationOffset;
Quaternion parentRot = m_rootPart.RotationOffset;
linkPart.SetGroupPosition(AbsolutePosition); // just change it without doing anything else
Vector3 axPos = oldGroupPosition - AbsolutePosition;
axPos *= Quaternion.Inverse(parentRot);
linkPart.SetOffsetPosition(axPos);
Quaternion newRot = Quaternion.Inverse(parentRot) * oldRootRotation;
linkPart.SetRotationOffset(false,newRot,false);
//Fix the link number for the root
if (m_rootPart.LinkNum == 0)
m_rootPart.LinkNum = 1;
SceneObjectPart[] objectGroupChildren = new SceneObjectPart[objectGroup.ChildrenList.Count];
objectGroup.ChildrenList.CopyTo(objectGroupChildren, 0);
//Destroy the old group
m_scene.SceneGraph.DeleteEntity(objectGroup);
objectGroup.IsDeleted = true;
objectGroup.ClearChildren();
lock (m_partsLock)
{
int linkNum = 2;
//Add the root part to our group!
m_scene.SceneGraph.LinkPartToSOG(this, linkPart, linkNum++);
linkPart.CreateSelected = true;
linkPart.FixOffsetPosition(linkPart.OffsetPosition, true); // nasty let all know about where this is
// let physics link it
if (linkPart.PhysActor != null && m_rootPart.PhysActor != null)
{
linkPart.PhysActor.link(m_rootPart.PhysActor);
this.Scene.SceneGraph.PhysicsScene.AddPhysicsActorTaint(linkPart.PhysActor);
}
//rest of parts
foreach (SceneObjectPart part in objectGroupChildren)
{
if (part.UUID != objectGroup.m_rootPart.UUID)
{
LinkNonRootPart(part, oldGroupPosition, oldRootRotation, linkNum++);
part.FixOffsetPosition(part.OffsetPosition, true);
if (part.PhysActor != null && m_rootPart.PhysActor != null)
{
part.PhysActor.link(m_rootPart.PhysActor);
this.Scene.SceneGraph.PhysicsScene.AddPhysicsActorTaint(part.PhysActor);
}
}
}
}
// Here's the deal, this is ABSOLUTELY CRITICAL so the physics scene gets the update about the
// position of linkset prims. IF YOU CHANGE THIS, YOU MUST TEST colliding with just linked and
// unmoved prims!
ResetChildPrimPhysicsPositions();
}