最低图形层级。对应于低端设备。
注意: 图形层级仅在内置渲染管线中受支持。
有关此图形层级对应的设备以及如何使用图形层级的更多信息，请参阅 图形层级。
其他资源: 图形层级, TierSettings, Graphics.activeTier, EditorGraphicsSettings.GetTierSettings, EditorGraphicsSettings.SetTierSettings.
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