You can change Ambient Occlusion Quality by replacing this file.

If the quality is too low, the AO shadow will become striped, but turning it down will improve performance.

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把不同的文件覆盖可以改变环境光遮蔽特效的等级。

如果等级太低，AO的阴影（也仅限于AO的阴影）会变成条纹状，但调低它的等级可以提高性能。