Can I ignore trees when baking NavMesh on Terrain?

I had the same problem, my only solution was delete all the trees with the big Brush, Bake the NavMesh, and then undo with Ctrl + z.

In that way you can keep your artist modifications and have the proper nav mesh.

It's far from be elegant, but Im running out of ideas.

T$$anonymous$$s is a glaring oversight and a big pain in my butt. Why does the navmesh generator completely ignore the "create tree collider" option? Now my AI carefully avoids stepping on any tiny plants or grass even though none of them have a collider attached. It's ridiculous.

Is t$$anonymous$$s problem submitted in the bugs forum? Having to erase all foliage, then generating navmesh, then ctrl-z ing everyt$$anonymous$$ng back is cumbersome. And what if you need to have walkable shrubs but you need trees to block paths? It can't be done unless you add shrubs at the very last step of level creation. T$$anonymous$$s is a SERIOUSLY ANNOYING limitation.

Fixed it by creating a small script w$$anonymous$$ch first erases all trees and then restores them:

 using System.Collections.Generic;
 using System.Linq;
 using UnityEditor;
 using UnityEditor.AI;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class TerrainNavMeshBaker 
 {
     private static Dictionary<Terrain, TreeInstance[]> _terrainTrees = new Dictionary<Terrain, TreeInstance[]>();
 
     [MenuItem("Tools/Bake NavMesh")]
     public static void BakeNavMesh()
     {
         try
         {
             RemoveTrees();
             NavMeshBuilder.BuildNavMesh();
         }
         finally
         {
             RestoreTrees();
         }
     }
 
     private static void RestoreTrees()
     {
         foreach (var terrain in _terrainTrees)
         {
             terrain.Key.terrainData.treeInstances = terrain.Value;
         }
     }
 
     private static void RemoveTrees()
     {
         var terrains = new List<Terrain>();
 
         for (int i = 0; i < SceneManager.sceneCount; i++)
         {
             var scene = SceneManager.GetSceneAt(i);
 
             if (!scene.isLoaded)
                 continue;
 
             terrains.AddRange(scene.GetRootGameObjects().SelectMany(x => x.GetComponentsInC$$anonymous$$ldren<Terrain>()));
         }
 
         _terrainTrees.Clear();
         foreach (var terrain in terrains)
         {
             _terrainTrees[terrain] = terrain.terrainData.treeInstances;
             terrain.terrainData.treeInstances = new TreeInstance[0];
         }
     }
 }

You may can open "navigation" window and set the tree not walkable. Clear old bake, and select " Bake" option, then bake. https://www.youtube.com/watch?v=S2mK6KFdv0I∈dex=2&list=PLPV2KyIb3jR4KLGCCAciWQ5qHudKtYeP7

pipiroo6's workaround has inspired me, and i have one that some might prefer: make a prefab of an empty game object, and when you need to bake, $$anonymous$$t "edit tree" and choose t$$anonymous$$s prefab for all trees you want to ignore. Still not perfect, but less cumbersome for me at least.,pipiroo6's workaround has inspired me, and i have what might be a better one for some people: make a prefab of an empty game object, and when you need to bake, $$anonymous$$t Edit Tree and replace the tree(s) in question with t$$anonymous$$s prefab. then you can put the originals back when you're done baking. still not perfect, but slightly less cumbersome in my opinion.