I've no idea where this grey is coming from. Transmission 1.0 and Roughness 0
3 Answers
I found a fix! Apparently my normals were facing the wrong way. You can check this by clicking on overlays and checking "Face Orientation"; Red means it is reversed. I Selected all my vertices and hit shift-n and voila no more silvery things! Thank you everyone who gave suggestions.
I believe it is reflecting the world texture. Try changing the color of the world as represented below and see if the reflection of the cup remains grey.
Another suggestion, change the IOR of your glass texture. This is related to the degree of the glass, like the ones we use in the face. Try putting it into 1 and it will show the object inside without any distortion.
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$\begingroup$ It is definitely reflecting the world but no color value can help me make the glass completely clean, I tried making the world color alpha 0 but still the grey persists. Changing the IOR value to 1 makes my glass completely invisible. $\endgroup$– deouy19Dec 22, 2019 at 8:12
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$\begingroup$ Oh man, sorry then :( If you find the answer, please post it here. I'm also curious on this one. $\endgroup$ Dec 22, 2019 at 13:07
Definitely try @Mateus Arruda
's answer first. If that doesn't work, try turning down the Alpha on that same node.
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$\begingroup$ Changing the Alpha definitely helps with the weird reflections but it makes my glass itself more transparent and even a middle value looks unnatural. $\endgroup$– deouy19Dec 22, 2019 at 8:16
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$\begingroup$ A combination of the two? Try turning the "Transmission" value up. Mess with IOR, Transmission, Transmission Roughness and Alpha until you get the right setup. $\endgroup$ Dec 22, 2019 at 13:48