I suppose this is a question about looping values in general in Playmaker. I am used to doing something like this, say to animate an alpha:
var lerp : float = Mathf.PingPong (Time.time, duration) / duration;
alpha = Mathf.Lerp(0.0, 1.0, lerp) ;
renderer.material.color.a = alpha;
However I would prefer to do this in Playmaker using actions, if possible. Is this an unusual usage of Playmaker to do this kind of loop somehow? Is this better done in a normal script?