Render2Texture.cs

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using UnityEngine;
using System.Collections;

public class Render2Texture : MonoBehaviour {

    public Texture2D textOut;
    RenderTexture rt;
    private bool once;

    void OnEnable () {
        rt = GetComponent<Camera>().targetTexture as RenderTexture;
        textOut = new Texture2D (rt.width, rt.height);
        GetComponent<Camera> ().enabled = true;
        GetComponent<Camera>().Render();
    }
    
    void OnPostRender () {
        textOut.ReadPixels (new Rect (0, 0, rt.width, rt.height), 0, 0);
        textOut.Apply();
        enabled = false;
        GetComponent<Camera> ().enabled = false;
    }
}