revival/game/Assets/Scripts/Rendering/GlitchInit.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Random = UnityEngine.Random;

[ExecuteAlways]
public class GlitchInit : MonoBehaviour
{
    private void OnEnable()
    {
        foreach (var glitchRenderer in GetComponentsInChildren<Renderer>())
        {
            var mpb = new MaterialPropertyBlock();
            mpb.SetVector(
                "_Positions", 
                new Vector4(Random.value,Random.value,Random.value,Random.value));
            glitchRenderer.SetPropertyBlock(mpb);
        }
    }
}