HOTween: Reusing the same Tweener???

Unity Engine
1

Hi Everyone,

I am trying to use HOTween to translating a game object to a random location when I press a button. So I do not have a predefined path it is completely dynamic. I did not want to create a new HOTween game object every time the translation occurs because it happens quite often. The only thing that changes is the positional information so I was hoping I could “ResetAndChangeParms” on a persistant Tweener object.

Here is an example of what I am trying to do:

Tweener positionTween = null
TweenParms posTweenParms = null;

void Start()
{
     HOTween.Init(true, true, true);
     HOTween.EnableOverwriteManager();
     
     posTweenParms = new TweenParms().Prop("localPosition", movingObject.transform.position)
			.Ease(EaseType.Linear)
			.OnComplete(myCallback).Pause(true).AutoKill(false);

       positionTween = HOTween.To(movingObject.transform, 0.0f, posTweenParms);
       positionTween.autoKillOnComplete = false;
}

void MoveTo(Vector3 _position)
{
     if (HOTween.IsTweening(movingObject.transform ) )
     {
          positionTween.Complete();
     }

	positionTween.ResetAndChangeParms(TweenType.To, 0.5f, posTweenParms.NewProp("localPosition", _position).Pause(false));
}

When I call MoveTo(…) once it works fine the HOTween object remains on the object and the positionTween component is fine though the loop says 1/1. When I call it a second time I get this warning:

“HOTween : PlugVector3 is overwriting PlugVector3 for Moving Object (UnityEngine.Transform).localPosition”

And immediately after I get this Error:

“NullReferenceException: Object reference not set to an instance of an object
Holoville.HOTween.Tweener.Update (Single p_shortElapsed, Boolean p_forceUpdate, Boolean p_isStartupIteration, Boolean p_ignoreCallbacks, Boolean p_ignoreDelay)”

Any insight would be appreciated. I know I could just create a new HOTween object and all but I am trying to keep my new calls to a minimum.

Peace

2

Hi bmcc, and sorry for the late answer, but I usually check only the “official” HOTween thread (my bad :P).

The problem is that a Tweener, when completed, is automatically killed. If you want to re-use a Tweener, you should set the AutoKill method-parameter to false

   [...]
   .Ease(EaseType.Linear)
   .AutoKill(false)
   [...]

That said, my bad for not making it more clear and logging a more useful message instead than letting an error happen. Will take care of that in a future release.