CallLoadScreen.cs

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

public class CallLoadScreen : MonoBehaviour
{
    public OVROverlay cubemapOverlay;
    public OVROverlay loadingTextQuadOverlay;
    public GameObject myCamera;
    public float distanceFromCamToLoadText;

    IEnumerator WaitforOVROverlay()
    {
        Transform camTransform = myCamera.transform;
        Transform uiTextOverlayTrasnform = loadingTextQuadOverlay.transform;
        Vector3 newPos = camTransform.position + camTransform.forward * distanceFromCamToLoadText;
        newPos.y = camTransform.position.y;
        uiTextOverlayTrasnform.position = newPos;
        cubemapOverlay.enabled = true;
        loadingTextQuadOverlay.enabled = true;

        yield return new WaitForSeconds(0.1f);

        /////重い処理をここでする
       // System.Threading.Thread.Sleep(2500); 
       
        cubemapOverlay.enabled = false;
        loadingTextQuadOverlay.enabled = false;
        yield return null;
    }

    public void LoadButton()
    {
        StartCoroutine(WaitforOVROverlay());
    }

}