将一个面的表面类型设为扩展多项式(Extended Polynomial)后,extra data编辑框里的第二项norm radius是什么呢?应该怎么设置呢?
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j@ zemax manual里的说明是“Normalization radius. All ray-intercept points are divided by this number to determine the x and y coordinates for polynomial evaluation.”,但是没看懂,请问大家怎么理解?
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