包含与跟踪网格相关的状态信息。
此结构体由 XRMeshSubsystem 用于确定哪些网格已添加、更新或删除。
其他资源：XRMeshSubsystem.TryGetMeshInfos
| ChangeState | 跟踪网格的更改状态（例如，添加、删除）。 |
| MeshId | 跟踪网格的 MeshId。 |
| PriorityHint | 一个提示，可用于确定何时应处理此网格。 |
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