LittleTools之输出RenderTexture工具

using UnityEngine;
using System.Collections;
using System.IO;
/// <summary>
/// Save render texture.
/// 1.需要在Assets同级目录下新建一个Dump文件夹
/// 2.一般绑在摄像机下
/// 3.摄像机中添加RenderTexture，并将其设置为OutputTexture
/// </summary>
public class SaveRenderTexture : MonoBehaviour {
        public RenderTexture OutputTexture;
        [ContextMenu("Save png")]  
        private void SaveTextureToFile()  
        {  
                if (OutputTexture != null)  
                {                         
                        RenderTexture prev = RenderTexture.active;
                        RenderTexture.active = OutputTexture;
                        Texture2D png = new Texture2D(OutputTexture.width, OutputTexture.height, TextureFormat.ARGB32, false);  
                        png.ReadPixels(new Rect(0, 0, OutputTexture.width, OutputTexture.height), 0, 0);  
                        byte[] bytes =  png.EncodeToPNG();  
                        string path = string.Format("Dump/raw {0}.png", Random.Range(0, 65536).ToString("X"));   
                        FileStream file = File.Open(path, FileMode.Create);
                        BinaryWriter writer = new BinaryWriter(file);  
                        writer.Write(bytes);  
                        file.Close();  
                        png = null;
                        RenderTexture.active = prev;  
                }
        }  
}