| boundaryOut | 表示边界的顶点列表。 |
bool 如果平面存在（即仍处于被跟踪状态），返回 true，否则返回 false。
尝试检索设备空间中描述当前平面边界的位置列表。
如果成功，系统会使用描述平面边界的顶点填充 boundaryOut 参数。
边界将始终包含至少四个顶点，也可能包含更多，这取决于
提供边界的特定设备。如果系统不再跟踪平面，则返回 false。
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