Glass, Absorption and Precedence?

[Glendaloch]

Here is a glass decanter that I am working on and getting confused about.

This precedence idea, if the glass is 10 and the liquid is 9 is this the same as glass 10 and liquid 5? If a glass stopper is put in this, should it have a different precedence number?

Also the absorption is confusing.

Does gain = absorption? Have seen mention of 5% (for water)??? Where is this set, ie gain is numbers not percent?

In the indigo tech. ref. it mentions under 'medium':

absorption_coefficient_spectrum

Controls the rate at which light is absorbed as it passes through the medium....etc
But where is this control on the interface, very frustrating....

(Indigo seems a great Renderer!)

[Meelis]

Precedence is for intersecting objects, larger % takes over 100% of another medium area in with it's intersecting.
It just have to be different, in glass with water glass has a larger %.

Gain 1 = 100% absorbed light per 1 meter = 1% per 1 cm = 0.1% per 1 mm

[Glendaloch]

Precedence is for intersecting objects, larger % takes over 100% of another medium area in with it's intersecting.
It just have to be different, in glass with water glass has a larger %.

Gain 1 = 100% absorbed light per 1 meter = 1% per 1 cm = 0.1% per 1 mm

Thanks for writing and explanation. Nice avatar!