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I've no idea where this grey is coming from. Transmission 1.0 and Roughness 0

Weird Reflection,Originally thought my glass was thick but it isn't

Opaque from the inside

Silver Metallic Reflection

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  • $\begingroup$ Because you didn't put thing around your platform. That's Blender default empty been rendered. $\endgroup$ – HikariTW Dec 21 '19 at 22:36
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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.

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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.

enter image description here

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.

Hope it helps :) enter image description here

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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. $\endgroup$ – deouy19 Dec 22 '19 at 8:12
  • $\begingroup$ Oh man, sorry then :( If you find the answer, please post it here. I'm also curious on this one. $\endgroup$ – Mateus Arruda Dec 22 '19 at 13:07
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Definitely try @Mateus Arruda's answer first. If that doesn't work, try turning down the Alpha on that same node.
enter image description here

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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. $\endgroup$ – deouy19 Dec 22 '19 at 8:16
  • $\begingroup$ 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. $\endgroup$ – CStafford-14 Dec 22 '19 at 13:48

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