GunSystem/Assets/Standard Assets/ParticleSystems/Scripts/FireLight.cs

using System;
using UnityEngine;
using Random = UnityEngine.Random;

namespace UnityStandardAssets.Effects
{
    public class FireLight : MonoBehaviour
    {
        private float m_Rnd;
        private bool m_Burning = true;
        private Light m_Light;


        private void Start()
        {
            m_Rnd = Random.value*100;
            m_Light = GetComponent<Light>();
        }


        private void Update()
        {
            if (m_Burning)
            {
                m_Light.intensity = 2*Mathf.PerlinNoise(m_Rnd + Time.time, m_Rnd + 1 + Time.time*1);
                float x = Mathf.PerlinNoise(m_Rnd + 0 + Time.time*2, m_Rnd + 1 + Time.time*2) - 0.5f;
                float y = Mathf.PerlinNoise(m_Rnd + 2 + Time.time*2, m_Rnd + 3 + Time.time*2) - 0.5f;
                float z = Mathf.PerlinNoise(m_Rnd + 4 + Time.time*2, m_Rnd + 5 + Time.time*2) - 0.5f;
                transform.localPosition = Vector3.up + new Vector3(x, y, z)*1;
            }
        }


        public void Extinguish()
        {
            m_Burning = false;
            m_Light.enabled = false;
        }
    }
}