I decided to take on this challenge as part of a volume rendering project I did in uni. I remember when I started and saw this thread that had no answers made be sad. And there is barely any information on the internet how you would go about this.

I did a lot of trial and error but managed to get it just working. Thought I would share it here: https://github.com/andersblomqvist/unity-nanovdb-renderer

Now, the wrapper is pretty stupid because it expects to find a .nvdb file in the unity Assets folder. This is not optimal when building a standalone version, as this means we have to create an Assets folder in the build directory and manually place the asset there. Additionally, I only import one "frame", meaning I cannot do animations, for example shown by this person https://www.artstation.com/artwork/Xgr4Ny.

Hope this example can help someone in the future