modeling - I have an undesirable black area on my glass shader

modeling - I have an undesirable black area on my glass shader

(Using Principled BDSF) I'm aware that glasses are naturally going to have a bit of black anyway, and I have no problem with the black sections around the base of the main section and the beginni

why is there a black rim on the top of the glass? (used only a glass shader node) : r/blender

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