指示在使用 Mesh.SetIndexBufferData 修改网格数据时，Unity 不应检查索引值。
使用 Mesh.SetIndexBufferData 修改网格数据时，Unity 的默认行为是验证提供的索引数组，以检查是否存在越界索引值。如果发现任何此类值，则 Unity 会抛出异常。
可以使用 MeshUpdateFlags.DontValidateIndices 标志使 Unity 跳过这些检查。这可能对性能大有裨益，但是如果使用此标志，则必须确保向网格传递有效数据。
另请参阅：Mesh.SetIndexBufferData。
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