LightFlicker.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


[RequireComponent(typeof(Light))]
public class LightFlicker : MonoBehaviour
{
    [Tooltip("Base Brightness of the flickering light (used when Normality happens)")]
    [Range(0.0f, 8.0f)]
    public float baseBrightness = 1.0f;

    [Tooltip("Intensity of the periodic brightness fluctuations")]
    [Range(0.0f, 10.0f)]
    public float fluctuationIntensity = 2.0f;
    [Tooltip("Frequency of the periodic brightness fluctuations")]
    [Range(0.0f, 100.0f)]
    public float fluctuationSpeed = 44.0f;

    [Tooltip("Intensity of the random brightness flicker")]
    [Range(0.0f, 10.0f)]
    public float flickerIntensity = 2.0f;
    [Tooltip("Frequency of the random brightness flicker")]
    [Range(0.0f, 1.0f)]
    public float flickerSpeed = 0.1f;
    [Tooltip("Off vs On-percentage of the random brightness flicker")]
    [Range(0.0f, 1.0f)]
    public float flickerOffVsOn = 0.5f;

    [Tooltip("Frequency of the normality effect (where flicker and fluctuations are switched off)")]
    [Range(0.0f, 1.0f)]
    public float normalitySpeed = 0.1f;
    [Tooltip("Likelihood of the normality effect to happen (where flicker and fluctuations are switched off)")]
    [Range(0.0f, 1.0f)]
    public float normalityLikelihood = 0.5f;

    float randomWalk = 0.0f;
    float flickerBrightness = 0.0f;
    float upperBound = 1.0f;
    float lowerBound = -1.0f;

    float fluctuationBrightness = 0.0f;

    float randomWalk2 = 0.0f;
    float upperBound2 = 1.0f;
    float lowerBound2 = 0.0f;

    Light thisLight;
    // Start is called before the first frame update
    void Start()
    {
        thisLight = this.gameObject.GetComponent<Light>();
    }

    // Update is called once per frame
    void Update()
    {
        // Flicker
        randomWalk += Random.Range(-flickerSpeed, flickerSpeed);
        if (randomWalk >= upperBound) { randomWalk = upperBound; }
        if (randomWalk <= lowerBound) { randomWalk = lowerBound; }
        flickerBrightness = (randomWalk * flickerIntensity) + (-8.0f + flickerOffVsOn * 16.0f) * flickerIntensity;

        // fluctuation
        fluctuationBrightness =  ((Mathf.PingPong(Time.time*fluctuationSpeed, 8.0f) * Mathf.PingPong(Time.time*fluctuationSpeed*1.131517f,4.0f)) - 4.0f) * fluctuationIntensity*0.1f;

        // Normality
        randomWalk2 += Random.Range(-normalitySpeed * 0.2f, normalitySpeed * 0.2f);
        if (randomWalk2 >= upperBound2) { randomWalk2 = upperBound2; }
        if (randomWalk2 <= lowerBound2) { randomWalk2 = lowerBound2; }