Bobber.cs

//Steffen Vetne made this
//Creative Commons 0

using UnityEngine;

[ExecuteInEditMode]
public class Bobber : MonoBehaviour
{
    //Fields
    public Vector3 localPosition;
    public float amount = 1;
    public Vector3 localDirection = Vector3.up;

    [Header("Time")]
    public float startTime;
    public float startTimeRandomization;
    public float rate = 1;
    public float rateRandomization = 0;
    
    private float t;
    private float r;



    //Lifecycle
    private void OnEnable() //Start()
    {
        t = startTime + (Random.value - 0.5f) * startTimeRandomization;
        r = rate + (Random.value - 0.5f) * rateRandomization;
    }

    private void Update()
    {
        t += Time.deltaTime * r;
        transform.localPosition = localPosition + localDirection * Mathf.Sin(t) * amount;
    }
}