Problem with transmission of a material that uses principled shader I'm having an issue with transmission in the principled shader. As you can see my material's base colour is blue, but when I add transmission to it goes dark?
EDIT: Also just realized that I left transmission roughness on 1, I was just trying to see if anything's gonna change with that, but no. It remained the same. So on transmission roughness any value from 0 to 1... no difference at all.
EDIT2: Using Eevee
Go to the Material Tab. Scroll down to &quot;Settings&quot; and Check &quot;Screen Space Refraction&quot;

You also need to enable &quot;Refraction&quot; in the &quot;Screen Space Reflections&quot; panel of the render properties. Render engine must be set to Eevee beforehand.

Also make sure the roughness value is not too high, above 0.5 it will gradually prevent refraction.