There is also an old video which doesn't seem to be linked from the docs or this post.
It has some useful info on using nodegraph nodes with VDB volumes.
OctaneRender for Modo voxel rendering tutorial: https://www.youtube.com/watch?v=0pTMl5G5sJU
Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 / 2x1920x1200 / MODO 14
"I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live" - Jesus Christ