| id | 要加载的 WorldAnchor 的标识符。 |
| go | 将 WorldAnchor 附加到的对象（如果已找到）。 |
WorldAnchor 按标识符加载的 WorldAnchor，或者 null（如果未找到）。
针对给定标识符从磁盘加载 WorldAnchor 并将其附加到 GameObject。如果 GameObject 具有 WorldAnchor，则将更新该 WorldAnchor。如果未找到锚点，则将返回 null，并且不会修改 GameObject 和附加到该对象的任何现有 WorldAnchor。
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