Question NavMeshAgent.CalculatePath returns true on first frame, should return false

Hello,

I have a little problem regarding the NavMesh-Calculations.
In my game theres an agent, who is trapped between dynamic carving obstacles, he should not be able to reach the target.
In the Start()-function, NavMeshAgent.CalculatePath == NavMeshPathStatus.PathComplete, which should not be the case.
I added a little time-buffer to recalculate the path after a certain amount of ms, it gives the right result than, but I already can feel thats bad practice.

My guess is that the obstacle carving takes longer to calculate than the first frame.
Is there anything I can do about that, like, is there a "WaitForCarvingToFinish" or something?

Code (CSharp):

1. public class NavMesh : MonoBehaviour
2. {
3.     [SerializeField] Transform target;
4.     [SerializeField] NavMeshObstacle obstacle;
5.     public NavMeshAgent navMeshAgent;
6.  
7.     NavMeshPath path;
8.  
9.     bool pathCheckedTwice;
10.     float timer;
11.  
12.  
13.     private void Start() {
14.         path = new NavMeshPath();      
15.         pathCheckedTwice = false;
16.         timer = 0;
17.         RecalculatePath();
18.     }
19.  
20.     private void Update() {
21.    
22.  
23.         //VERY BAD CODE! Waiting for dynamic obstacles to finish calculating before checking Path
24.         timer += Time.deltaTime;
25.         if(timer >= 0.05 && !pathCheckedTwice){
26.             RecalculatePath();
27.             pathCheckedTwice = true;
28.         }
29.  
30.     }
31.  
32.     //gets called when mousebutton is released after dragging dynamic obstacle
33.     public void RecalculatePath(){
34.    
35.         if (navMeshAgent.CalculatePath(target.position, path))
36.         {      
37.             if (path.status == NavMeshPathStatus.PathComplete){
38.                 navMeshAgent.destination = target.position;
39.                 navMeshAgent.isStopped = false;
40.             }
41.             else{
42.                 navMeshAgent.isStopped = true;
43.             }
44.         }
45.     }
46. }

 

You can try using this event:
https://docs.unity3d.com/ScriptReference/AI.NavMesh-onPreUpdate.html

 

that looks very promising. I‘ll try it. Thanks a lot!