Hi, 关于这部分，可以在说明书The Setup Tab > Editors Group (Setup Tab) > Lens Data Editor > Surface Properties > Physical Optics → Use X-axis Reference中找到相关的解答

By default, the grid of rays used to generate the transfer function at any surface is oriented such that the Y-axis of the grid aligns with the Y-axis of the beam. In highly tilted systems this choice of alignment may not be appropriate. This option allows the orthogonal choice of grid alignment, i.e. one in which the X-axis of the grid aligns with the X-axis of the beam.

谢谢你的解答。目前有个问题就是光线网格的方向是怎么定义的。或者就是光束Y轴参考和光线网格方向是哪个为先，以什么为定义标准。因为现在我们找不到这个方向是怎么定义的。

Thank you for your answer. The problem is how to define the direction of the grid of rays. Or just which comes first, the Y-axis reference of the beam or the direction of the grid of rays, and what is the defining criteria. Because right now we can't find how this direction is defined.