| polygon | 来自NavMesh表面或链的节点的标识符。 |
当节点是NavMesh表面上的多边形时，返回 NavMeshPolyTypes Ground。
当节点是 NavMeshLink 或 Off-mesh Link 时，返回 OffMeshConnection。
返回NavMesh节点是多边形还是链接。
类型可以在指定的节点在查询的NavMeshWorld中无效后确定。
已知问题，待修复：如果查询的 NavMeshWorld 由于任何原因无效，则方法返回 NavMeshPolyTypes.OffMeshConnection。
其他资源：NavMeshPolyTypes，NavMeshQuery.IsValid，NavMeshWorld.IsValid。
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