Got it in but not sure it's working properly. First off I use 3.8 ..and called NavMeshUpdateAroundObject. In my version the function didn't have a reference to mPathfindingIgnore in sceneObject.cpp / h so I added that but I can make the call and it returns. Not sure if the "ignore" is the only equate for that. Anyhow here is a link to a pic. I drive the vehicle in and make the call on exit and you can see the result ...
Since this function checks worldbox and a vehicle box is off the ground because of the tires and the bot reference is on the ground do you think this might be an issue?
If something protruded from a wall at waist high the bot will run into it? Or the octree checks for any path obstruction in vertical from worldbox on bot player.?