指示地形洞穴数据的更改。
当地形洞穴数据发生更改时，将设置此标志，例如，在调用 TerrainData.SetHoles 之后。请注意，调用 TerrainData.SetHolesDelayLOD 不会设置此标志，即使这些调用更新了地形洞穴数据。请参阅 DelayedHolesUpdate。
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