cppk-ar/Assets/Scripts/SceneHandler.cs

using System.Linq;
using System.Collections;
using System.Threading.Tasks;
using System.Collections.Generic;

using UnityEngine;

public class SceneHandler : MonoBehaviour
{
    [SerializeField] Material skyboxMaterial;
    [SerializeField] float startPositionValue;
    [SerializeField] float endPositionValue;
    [Space]
    [SerializeField] GameObject[] disableOnStart;

    async Task Start()
    {
        foreach(var item in disableOnStart)
            item.SetActive(false);

        var skyboxExposure = 1;
        float currentExposure = 0;
        skyboxMaterial.SetFloat("_Exposure", 0);

        float currentPositionValue = startPositionValue;

        var objectsWithEffect = FindObjectsOfType<MeshRenderer>()
            .Where(x => x.sharedMaterial.shader.name.Contains("S_Holographic"))
            .ToList();

        foreach(var item in objectsWithEffect)
            item.sharedMaterial.SetFloat("_EffectPosition", startPositionValue);

        while(currentPositionValue != endPositionValue)
        {
            currentPositionValue = Mathf.MoveTowards(currentPositionValue,
                endPositionValue,
                Time.deltaTime * 3);

            Debug.Log(currentPositionValue);

            foreach(var item in objectsWithEffect)
                item.material.SetFloat("_EffectPosition",
                    currentPositionValue);
            
            await Task.Yield();
        }

        while(currentExposure != skyboxExposure)
        {
            currentExposure = Mathf.MoveTowards(currentExposure, skyboxExposure, Time.deltaTime);
            skyboxMaterial.SetFloat("_Exposure", currentExposure);

            await Task.Yield();
        }

        foreach(var item in disableOnStart)
            item.SetActive(true);
    }
}