Why does the mirror material not consider the fresnel reflection?

According to the document “Behavior of Materials in Radiance,” it appears that the consideration of Fresnel reflection was omitted. This is evident from the constant reflectance, which does not vary with incident angle. I have also conducted tests and confirmed that the Fresnel effect was not taken into account. Therefore, I would like to inquire if there is a way to adjust the normal reflectance based on the incident angle when utilizing mirror material for calculating specular reflectance of facades.


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Thank you so much, Stephen!