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I have a beer setup in my blender scene. It's a basic glass shader for the glass containing a fluid mesh with a glass + volume absorption material with a tint.

I don't understand why the fluid is rendering completely black. Here's a render.

My beer render

It's supposed to look more like this (froth and bubbles aside):

The aim

Here's the fluid node setup:

Fluid node setup

Here's the glass node setup:

Glass node setup

I don't know what's going wrong. I've tried a couple of things.

Thanks for your help in advance. Please let me know if you need more information.

EDIT: I've upped the light bounces and this is the finished result, thought you might want to see :) (obviously still needs some tweaking) Finished render

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Even though you have 'Transmission' bounces set to 12 you are capping the 'Max' bounces to 4, meaning it's never doing 12 bounces. Here I have upped the 'Max' bounces to 6 and the liquid started to let light through:

enter image description here

If you want the liquid to use all 12 Transmission bounces you will have to set your 'Max' bounces to 12 as well.

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    $\begingroup$ Thanks a lot! I had a suspicion it might have to do with light paths. I have the bounces low because it cuts render times and usually I don't need more than 4 but I never thought this might be why... Thanks again. :) $\endgroup$
    – Cubit
    Dec 17, 2015 at 19:52

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