Original Post — Direct link

Goto Level then Volumes,

Click “Navmesh Clip”

Hit ‘e’ to create the node

Make sure the top of the node is over the surface you need (in my case it is the roads)

Make it as big as you want

Place your nav and bake it

Slightly jenky with some flying zombies but that’s ok, they were fine on the streets.

I assume this works to make bunker navs too as you can limit the height. But as you can see if any buildings/objects are capable of entering that mesh they will.

External link →
about 2 months ago - /u/SDGNelson - Direct link

I'm late to the party suggesting this, but is it possible the roads it's not generating on were scaled negative/flipped? IIRC there was a similar issue at one point with the roads on Kuwait.