Version: 2020.2
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MonoBehaviour.InvokeRepeating

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public void InvokeRepeating(string methodName, float time, float repeatRate);

Description

Invokes the method methodName in time seconds, then repeatedly every repeatRate seconds.

Note : This does not work if you set the time scale to 0.

using UnityEngine;
using System.Collections.Generic;

// Starting in 2 seconds. // a projectile will be launched every 0.3 seconds

public class ExampleScript : MonoBehaviour { public Rigidbody projectile;

void Start() { InvokeRepeating("LaunchProjectile", 2.0f, 0.3f); }

void LaunchProjectile() { Rigidbody instance = Instantiate(projectile);

instance.velocity = Random.insideUnitSphere * 5; } }