I have a terrain in my scene that I’ve used to place tree and was also using it for the nav mesh. But I want to create a separate piece of geometry to use instead for the nav mesh.
I go in to Navigation, clear the bake - select my new geometry and hit bake. It uses the new geometry but ALSO is still using the terrain object.
How to I exclude the terrain object so I can only use the new geometry for the bake?
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I just bumped into this one as well and found a solution.
I’m using navmesh building components Unity - Manual: NavMesh building components
What I did to resolve it is to create a layer called Terrain and add the terrain to this layer. After this you can add an empty game object with a navmeshsurface script and remove Terrain from include layers.
Just add a plane to the empty game object as a child ( with the navmeshsurface script ) and press bake on the script component.
No more terrain navmesh baking!
Can’t you just go into the Object tab of the Navigation window and uncheck the options associated to the Terrain?
There doesn’t seem to be anything associated with any specific Terrain, just all Terrains. Wouldn’t help if one wanted to, for example, use a Terrain as a backdrop without a navmesh. I’m attempting right now to make the ones I don’t want Walkable Non-Walkable.
Update: This worked, there is no longer a NavMesh at all on the Terrains I marked as Non-Walkable. Nine square miles of NavMesh takes a while 
Edit: whoops, 9 sq miles was what WAS walkable; it was 72 sq miles I made unwalkable. No wonder… Just flabbergasted Unity handled either so well…