 
 				for (i = 0; i < vertices.length; i++)
 				{
-					vertices[i] = vertices[i].add(position);
+					vertices[i].incrementBy(position);
 					// 投影到 2D 坐标系后，再交给 Quad 画线
 					points[i] = new Point(vertices[i].x, _projectY(vertices[i].y, vertices[i].z));
 				}

		public function set direction(value:int):void
		{
			_direction = value;
			currentFrame = _currentFrame
		}

		private var _position:Vector3D = new Vector3D;

			}
		}

		private var box:Box = new Box();

		public function validate():void
		{
			if (_frameInfo && _frameInfo.keyframe.box)
			{
				// 取关键帧的 box
				const originBox:Box = _frameInfo.keyframe.box.clone1();
				box.direction = Direction.RIGHT;
				box.setTo(originBox.x, originBox.y, originBox.z, originBox.width, originBox.height, originBox.depth, originBox.pivot.x, originBox.pivot.y, originBox.z);
				box.direction = _direction;
				// 取出所有顶点用于绘制
				const vertices:Vector.<Vector3D> = box.vertices.concat();
