请求启用导航调试图形的用户的计数。
如果值为正,NavMesh 调试图形将显示在场景视图中。 通常的用法是在启用用于可视化 NavMesh 组件的编辑器时增加该数值。然后在编辑器关闭时减少该数值 - 例如 OnDisable。
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