Version: 2019.1 (switch to 2018.3 or 2017.4)
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Mathf.PingPong

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public static float PingPong(float t, float length);

Description

PingPongs the value t, so that it is never larger than length and never smaller than 0.

The returned value will move back and forth between 0 and length.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Update()
    {
        // Set the x position to loop between 0 and 3
        transform.position = new Vector3(Mathf.PingPong(Time.time, 3), transform.position.y, transform.position.z);
    }
}

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Copyright © 2019 Unity Technologies. Publication: 2019.1-002V. Built: 2019-04-15.
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