FSO.SimAntics.VMContext.UnregisterObjectPos C# (CSharp) Method

        public void UnregisterObjectPos(VMEntity obj)
        {
            var pos = obj.Position;

            //remove object from room

            var room = GetObjectRoom(obj);
            RoomInfo[room].Entities.Remove(obj);
            if (obj.EntryPoints[15].ActionFunction != 0)
            { //portal
                RemoveRoomPortal(obj, room);
            }
            if (obj.GetValue(VMStackObjectVariable.LightingContribution) > 0)
                RefreshLighting(room, true);

            SetToNextCache.UnregisterObjectPos(obj);
        }

        public override void PositionChange(VMContext context, bool noEntryPoint)
        {
            if (GhostImage)
            {
                return;
            }

            var room = context.GetObjectRoom(this);

            SetRoom(room);

            if (HandObject != null)
            {
                context.UnregisterObjectPos(HandObject);
                HandObject.Position = Position;
                HandObject.PositionChange(context, noEntryPoint);
            }

            context.RegisterObjectPos(this);
            if (Container != null)
            {
                return;
            }
            if (Position == LotTilePos.OUT_OF_WORLD)
            {
                return;
            }

            base.PositionChange(context, noEntryPoint);
        }