wallace wrote:This is expected, because if albedo (diffuse) is not present, then the transmission layer and the specular layer essentially becomes a specular material on its own, and so it uses the same model as the one specified by "Reflection model".
If I disconnect albedo, and set specular and transmission to 1, it becomes solid. This is not how the specular material works.
EDIT: Actually it seems disconnecting albedo is giving it some default color thats close to white, which means you get no transmission.
Setting albedo to black, makes it work like the specular material (BRDF controlled by reflection model). It's a bit confusing, but I think I understand.
You need to set albedo to something like 0.0001, if you want to control both models in a "glass" material.
You dont get the same result as a specular material if you set both models to the same value though. I'm not sure if that's intentional.