using UnityEngine;

 using System.Collections;

 using UnityEngine.UI;

 using System.IO;

 public class TestRenderTexture : MonoBehaviour {

     public Camera camera;

     public RawImage rawImage;

     bool isScreenShot = false;

     void Update()

     {

         //将镜头的画面保存到本地

         if (Input.GetKeyDown(KeyCode.Q))

         {

             Texture2D tex = RenderTexture2Texture2D(camera.targetTexture);

             //展示

             rawImage.texture = tex;

             //保存到本地

             byte[] bytes = tex.EncodeToPNG();

             File.WriteAllBytes(Application.dataPath + "/RenderTexture/Test.png", bytes);

             UnityEditor.AssetDatabase.Refresh();

         }

         //屏幕截图(方法1)

         if (Input.GetKeyDown(KeyCode.W))

         {

             StartCoroutine(ScreenShotIEnumerator());

         }

         //屏幕截图(方法2)

         if (Input.GetKeyDown(KeyCode.E))

         {

             isScreenShot = true;

         }

     }

     public IEnumerator ScreenShotIEnumerator()

     {

         yield return new WaitForEndOfFrame();

         rawImage.texture = ScreenShot();

     }

     private void OnPostRender()

     {

         //Debug.Log("OnPostRender");

         if (isScreenShot)

         {

             isScreenShot = false;

             rawImage.texture = ScreenShot();

         }

     }

     //屏幕截图

     public Texture2D ScreenShot()

     {

         Texture2D tex = new Texture2D(Screen.width, Screen.height, TextureFormat.ARGB32, false);

         tex.ReadPixels(new Rect(, , Screen.width, Screen.height), , );

         tex.Apply();

         return tex;

     }

     //RenderTexture转Texture2D

     public Texture2D RenderTexture2Texture2D(RenderTexture rt)

     {

         RenderTexture preRT = RenderTexture.active;

         RenderTexture.active = rt;

         Texture2D tex = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, false);

         tex.ReadPixels(new Rect(, , rt.width, rt.height), , );

         tex.Apply();

         RenderTexture.active = preRT;

         return tex;

     }

 }