Unity Animator SetTrigger not resetting to default

Question

As I hopefully correctly understand the Animator "SetTrigger" will set the animation to false once it's done (correct me if I'm wrong), but this is not the case for my project.

I have two states. Default (do nothing) and Move. Default is automatically entered when the app is opened and Move is triggered when I call "SetTrigger". I expect that Animator will set this animation id to false once the animation is done and then go back to Default state. but this is not the case - animation keeps repeating. I can achieve this by calling "ResetTrigger" manually but then I need to detect when the animation is done, which is not convenient in my case.

I want to achieve that animation is played only once when called. Any ideas?

Thanks

EDIT: Adding animation controller

public class TestAnimation : MonoBehaviour
{

    private Animator _animation;
    private static readonly int Playing = Animator.StringToHash("PlayingTrigger");

    // Start is called before the first frame update
    void Start()
    {

        _animation = GetComponent<Animator>();
    }

    // Update is called once per frame
    void Update()
    {

        if (Input.GetKeyDown(KeyCode.A))
        {
            _animation.SetTrigger(Playing);
         //   _animation.ResetTrigger(Playing);

            IDebug.Log("Playing animation ");
        }
        
        if (Input.GetKeyDown(KeyCode.R))
        {
            _animation.ResetTrigger(Playing);
            IDebug.Log("reseting animation ");
        }
        

    }
}

Its a little bit hard to explaing whitout an image of the animator interface but you can create bool variables and asociate it in the conditions of transitions (arrows) betwen the animations. In a way that when you active than boolean in a script the animation starts and when you put it in false the animation stops. I hope that this help you :) — ZeroCodeException

derHugo derHugo · Accepted Answer · 2021-05-19T14:42:00

the Animator "SetTrigger" will set the animation to false once it's done

-> Nope!

The only thing it does is resetting the trigger itself once it was used for a transition, it doesn't mean the animation state is reset once the animation has reached the end.

If you want your Animator go back to the idle/default state after your animation is done then in the controller add a transition

yourState -> Idle/Default

with

Has Exit Time -> True
Duration -> as you like
Exit Time -> 1 - Duration

No further condition.

One pitfall though: Afaik the triggers can stack!

This means if you call 5 times SetTrigger then that trigger will be used for 5 transitions until it is finally reset and doesn't trigger the transition anymore!

At least that was the case in earlier versions .. not sure if this was ever changed.

Therefore I ended up using a trigger resetter directly attached not to a specific state but the Basic layer itself -> it is automatically called for each and every entered state:

public class TriggerRestter : StateMachineBehaviour
{
    override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        foreach(var p in animator.parameters)
        {
            if (p.type == AnimatorControllerParameterType.Trigger)
            {
                animator.ResetTrigger(p.name);   
            }
        }
    }
}

Unity Animator SetTrigger not resetting to default

1 Answers