4.3.83 - seeker.pathCallback deprecated - Callback needed for SearchPath()

General
1

Hello Aron,

since seeker.pathCallback is deprecated now, I am missing a callback for when I do set the ‘destination’, and then call SearchPath()…

Currently only the SetPath() method does have a callback…

Greetings
Denzi

2

Hi

Could you elaborate on why you need this callback?

3

Well, I need to know when the path calculation has been finished … maybe I am not getting it, and there is already some functionality for that :slight_smile:

I currently do override RichAI, and in OnEnable I attach to the seeker.pathCallback event, after which I fire “my own event” in the overriden RichAI…

That seems to not work anymore in 4.3.83

4

But why do you need to know this?

You can already check the pathPending property.

5

Ok, polling would solve the issue… makes it a bit more complicated… because I start in a “state” that searches the new path, and then runs at least until it has found a solution once…

That means I would have to implement an Update() method or something, to poll for if the SearchPath is finished.

Simply put, it makes it more complicated for me :rofl:

Then the question arises: why have a callback for SetPath, and not for SearchPath? :smiley:

Sorry, no offense :grinning:

6

Maybe something like this:

IEnumerator DoStuff() {
    ai.destination = ...;
    ai.SearchPath();
    while(ai.pathPending) yield return true;
}

...
StartCoroutine(DoStuff());

Generally, the intention is that when you pass a path to the SetPath method, you leave the path’s callback as null.

7

I just noticed this method in AIBase:

/// <summary>Called when a requested path has been calculated</summary>
protected abstract void OnPathComplete(Path newPath);

Stupid me :rofl:

That would exactly be the solution… I override that method in my RichAI-overridden class (called MovementAgent, for whatever reason? :smiley: )

protected override void OnPathComplete(Path p)
{
	base.OnPathComplete(p);

    if (p.IsDone())
    {
        OnPathFound?.Invoke(p);
    }
}
8

Just tried to leave it as null, and it throws me some warnings, that I should add a correct callback :smiley:

I actually do call the SetPath() method only when trying to calculate a Flee path…

9

Btw, somewhat related, I sometimes do get this error message, multiple times in a row, from searching a flee path:

Failed to find next corners in the path
UnityEngine.Debug:LogError (object)
Pathfinding.RichFunnel:Update (UnityEngine.Vector3,System.Collections.Generic.List`1<UnityEngine.Vector3>,int,bool&,bool&) (at ./Library/PackageCache/com.arongranberg.astar@4.3.83/Core/AI/RichPath.cs:401)
Pathfinding.RichAI:UpdateTarget (Pathfinding.RichFunnel) (at ./Library/PackageCache/com.arongranberg.astar@4.3.83/Core/AI/RichAI.cs:385)

I am using the flee code from here in the forum:

// The path will be returned when the path is over a specified length (or more accurately when the traversal cost is greater than a specified value).
// A score of 1000 is approximately equal to the cost of moving one world unit.
var theGScoreToStopAt = (int)(distance * 1000f);

// Create a path object
var path = FleePath.Construct(transform.position, fleeFrom, theGScoreToStopAt);
// This is how strongly it will try to flee, if you set it to 0 it will behave like a RandomPath
path.aimStrength = aimStrength;
// Determines the variation in path length that is allowed
path.spread = (int)Mathf.Max(4000, distance);

// Start the path and return the result to MyCompleteFunction (which is a function you have to define, the name can of course be changed)
seeker.StartPath(path, OnPathComplete);

(Using Mathf.Max with 4000 was just guessing from my side, maybe it would make it less often “fail to find next corners in the path” :slight_smile: )

Often - but not always - the AI will stop moving for a moment when this happens, and after a while just continues to function.