Unity - Navmesh event on navigation end

Question

Is there a way to raise a flag on the Navmesh navigation end, or to use a callback when it finish?

I want to run a function when my objection reach to the desire position, I can check on every frame update if the navigation has finished but I want a more elegant and efficient solution.

Thanks.

score 0 · Answer 1 · answered May 15 '20 at 21:09

0

It depends what you mean by "ends", if you want to know when a path is no longer available for the NavAgent, you can use pathStatus, for example you could write:

if(myNavAgent.pathStatus != NavMeshPathStatus.PathComplete) {
  // Do stuff
}

If you me reaching a location such as a "waypoint" you can use myNavAgent.remainingDistance then check if it is less than a certain value.

Here's the unity NavAgent scriptingAPI doc link: https://docs.unity3d.com/ScriptReference/AI.NavMeshAgent.html

If this doesn't work, let me know!

answered May 15 '20 at 21:09

CodingGuy

71
7

1

I mean when the agent reaches his destination – Ilan12 Jun 01 '20 at 17:38
Then use what i said about `myNavAgent.remainingDistance`, doing things such as `if(myNavAgent.remainingDistance < 0.1)` – CodingGuy Jun 03 '20 at 14:05
3

But then I have to use exhaustive checks, its not the same as callback. – Ilan12 Oct 21 '21 at 07:37

Selcuk Oruc · Answer 2 · 2022-10-18T14:07:32.380

0

I have Thought the same question and i couldn't find a callback, However i managed to solve with triggers. For example if my agent goes point a, i put trigger that position and when my agent touches it i stopped agent.

edited Oct 18 '22 at 14:07

answered Oct 18 '22 at 13:09

Selcuk Oruc

9
2

shenntaro · Answer 3 · 2023-06-20T22:03:30.333

If someone will search, then here is my solution:

NavMeshAgent _agent; 
bool _hasPath;

public Action OnPointReached;

void Update()
{
    if (_hasPath)
    {
        if(!_agent.hasPath)
        {
            _agent.isStopped = true; // For understanding - here the agent stops 
            OnPointReached?.Invoke(); // here we start an event or a function
        }
        else
        {
            _agent.isStopped = false; // The agent is moving
        }
    }
}

void LateUpdate()
{
    _hasPath = _agent.hasPath;
}

The bottom line is that you need to duplicate the NavMeshAgent.hasPath value for the first check, but send it late - for this we assign the _hasPath value in LateUpdate. Roughly speaking: the agent will reach the destination, but the check will work again due to the fact that the value has not yet been updated, and inside we transfer the current value directly from the agent and get a single event firing.

Unity - Navmesh event on navigation end

3 Answers3