Flicker

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

//Coded by ninjapretzel
//Flicker behaviour
//Add to a GameObject to make its renderer 'flicker'
public class Flicker : MonoBehaviour {

    public bool animate = true;

    public float tickTime = .1f;    //Time in seconds per 'tick' (.1 = .1sec full alpha, .1sec reduced alpha, .1sec full, etc)
    public float alphaScale = .3f;  //How transparent are the 'faded' ticks?

    float timeout = 0;              //timer to keep track of current time this tick.
    float fullAlpha = 1;            //Keep track of full alpha. We will grab this info from the material on start.
    bool full = true;               //Flag to keep track of if we should use the full or reduced alpha

    void Start() {
        fullAlpha = renderer.material.color.a;
        timeout = 0;
        full = true;
    }

    void Update() {
        Color c = renderer.material.color;
        c.a = fullAlpha;

        //Is the effect animating?
        if (animate) {
            //Accumulate time into the timer
            timeout += Time.deltaTime;

            //Process all ticks that would have happened over the deltaTime
            //(incase of a delay, we don't want it to instantly flip for a few frames)
            while (timeout > tickTime) {
                timeout -= tickTime;
                full = !full;
                //Subtract the time for that tick, and flip the fade flag.
            }

            //If we are not full this frame, set the reduced alpha value.
            if (!full) {
                c.a *= alphaScale;
            }

        }

        //This will apply the full alpha if we are not animating,
        //And then partial alpha half the time if we are.
        renderer.material.color = c;
    }

}