Why is a. Volume shader not working along with a glass BSDF shader? I recently saw this video on youtube by Midge Sinnaeve. I think there was a lot to learn from there so just after finishing it I opened Blender and I tried to recreate what he was doing on min 54:30.
Thing is, my glass shader doesnt look like the one in the video at all. Before I add the volume shader everything is ok, I can see the reflexions on the surface, but, when I create a volume Suzane under the glass I can't see anything new. If I take the glass off I can see the volume monkey so I don't think the problem has anything to do with this one.
I attach photos so you can see what I mean.
This is what it should look like.

This is what mine is looking like.
I've already done it a couple times so the node configuration should be alright
Solution: Make sure you set the max bounces for volumes (inside Render Tab &gt; Light Paths) to more than 0.
There are two suzannes in the scene;
One has a  simple glass shader with a solidify modifier and is the &quot;outer suzanne&quot; as I'll call it.
The second is inside the first and has a volumetric material (the tree I used is below). Midge added a displace modifier to this one to shrink it .
Suzanne 1 (Outer) should look as so with the solidify:

Modifier stack will be as follows:

Suzanne 2 (Inner) should be as shown below, just slightly smaller than the outer suzanne to avoid any intersections that will cause shading issues will the glass material:

modifiers for inner suzanne are as follows:

This is the volumetric material I used:

Click to enlarge
The result is about as below, but any volumetric material could be used: