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


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.

  • 1
    $\begingroup$ 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 '15 at 19:52

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