NavMesh Question

I am making a twin stick space shooter. I need all of the empty space to be navigable without having to use a collision mesh to generate the navigation data (There is no floor in space). If I use a volume/mesh with collision, my actors collide with the “surface”. I have tried using NavMesh Modifier Volumes, but none of them cause the NavMesh to draw anything by themselves. Is it possible in the editor or in blueprint to make everything (or at least a large area) navigable except for where enemies, asteroids, space stations, etc are located? If so, where I am going wrong?

Thank you!

So… no?

I don’t think 3D navmesh is a thing yet.