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我需要将一个RenderTexture对象保存为.png文件,然后将该文件用作包裹3D对象的纹理.我的问题是现在我无法使用EncodeToPNG()保存RenderTexture对象,因为RenderTexture不包含该方法.如何将RenderTexture对象转换为Texture2D对象？谢谢!

// Saves texture as PNG file.
using UnityEngine;
using System.Collections;
using System.IO;

public class SaveTexture : MonoBehaviour {

    public RenderTexture tex;

    // Save Texture as PNG
    void SaveTexturePNG()
    {
        // Encode texture into PNG
        byte[] bytes = tex.EncodeToPNG();
        Object.Destroy(tex);

        // For testing purposes, also write to a file in the project folder
        File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);
    }
}