3d reverse masking of volumetric Is it possible to create a volumetric cube but mask only the space of that volumetric cube by a mesh?
Hence if I put Suzanne inside the volumetric I only see her?
The effect I am looking for is how at night with a torch if you shine it in smoke you only see the smoke as it passes through the light ray. I want to make shock wave torus rings that mask a volumetric cube with a random noise, so that the torus rings only expose the smoke.
Volumetric Cube catching Torus Light
Is this what you are looking for?

Cube with Principled Volume Shader
(Density 0.1 / Anisotropy 0.95)
Torus with Emission Shader
(Properties editor &gt; Object &gt; Visibility &gt; Ray Visibility &gt; Camera OFF)

So what you see is only light rays catching on Volumetric


Something more colourful ... Torus with Noise texture and Displacement Modifier.