How to know when the AI path calculation failed?

General
1
  • A* version: 5.2.5
  • Unity version: 2022.3.23

Hello!

I am looking for a way to be notified when a Path calculation fails, so that I can handle it as I need (try again, change destination, teleport, …):

pseudo-code:

IAstarAI ai;
ai.destination = Vector3.one;

// Some frames later
if (ai.path.CompletedState == Error) {
  // Do something depending on game logic. Don't try to recalculate path again and again as it has a very high probability of failing again
  // Ideally know the error type (canceled, cannot find end, unreachable, ...)
}

Is there a way to do that without having to create and handle Path manually. I’d rather not lose the functionalities provided by Seeker // FollowerEntity out of the box.

Thank you!

2

You can use Path.error for this :slight_smile: There’s also Path.errorLog to know what the error was :+1:

3

But how can I get the current Path from an IAstarAI?

4

It sounds like you’re not using Seeker, based on the " I’d rather not lose the functionalities provided by Seeker // FollowerEntity out of the box." line. I dug around but I don’t see how IAstarAI holds its path, but you have the option to create a path, then assign it to the interface yourself. Here’s a quick example of what I got working:

ABPath newPath = new(){
	startPoint = transform.position,
	endPoint = Vector3.zero // Destination. I just made them all go to the origin
};

ai.SetPath(newPath);
ai.SearchPath();

There you’d have access to the path itself where you can check it where you’d need. There’s other options too, though.