Hi @ehddnjsdn,
I don’t currently have any VDBs open to test this on, but I have two potential solutions for you.
First, try enabling “Composite with Translucency” in your project settings.
The description is a little unclear, but I believe it will allow you to render them out as a separate translucency pass.
You can also try rendering them into the custom depth buffer, though I’m not sure how well that will work. I suspect even if it is able to be rendered to the custom depth buffer, it may not retain the shape of the actual VDB and just the volume box.
