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


PingPong returns a value that will increment and decrement between the value 0 and length.

PingPong requires the value t to be a self-incrementing value, for example Time.time, and Time.unscaledTime.

using UnityEngine;

public class PingPongExample : MonoBehaviour { Light myLight;

void Start() { myLight = GetComponent<Light>(); }

void Update() { myLight.intensity = Mathf.PingPong(Time.time, 8); } }