Capture Screenshot And Apply Texture To Material

ApplyScreenshotToMaterial.cs

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

public class ApplyScreenshotToMaterial : MonoBehaviour
{
    public Material m_targetMaterial;
    public string m_targetTextureName = "_MainTex";
    Texture2D m_lastScreenshot;

    void Start()
    {        
        m_lastScreenshot = new Texture2D(Screen.width, Screen.height);
    }

    IEnumerator TakeScreenshotApplyToMat()
    {
        yield return new WaitForEndOfFrame();        
        m_lastScreenshot.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0, false);
        m_lastScreenshot.Apply();
        m_targetMaterial.SetTexture(m_targetTextureName, m_lastScreenshot);
    }

    void LateUpdate()
    {
        if(Input.GetKeyDown(KeyCode.Space))
            StartCoroutine(TakeScreenshotApplyToMat());
    }

}