u3d摄像机截图

using System;

using UnityEngine;

using System.Collections;

public class TestCamreaCapture1 : MonoBehaviour {

    private string imagesPath;

    private int imageIndex = ;

    private RenderTexture rt;

    private Texture2D screenShot;

    private System.Diagnostics.Stopwatch stopWatch;

    // Use this for initialization

    void Start () {

        imagesPath = Application.dataPath + "/../pic/";

        stopWatch = new System.Diagnostics.Stopwatch ();

        rt = new RenderTexture (Screen.width,Screen.height, );

        //将rt附给一个摄像机，这样这个摄像机实时渲染的结果就都在这个tex上了.

        GetComponent<Camera>().targetTexture = rt;

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

    }

    // Update is called once per frame

    void Update () {

        StartCoroutine (ScreenShoot());

    }

    IEnumerator ScreenShoot(){

        yield return new WaitForEndOfFrame ();

        stopWatch.Start ();

        ScreenSave ();

        imageIndex++;

        stopWatch.Stop();

        Debug.Log (string.Format("generate one pic use {0} 'ms",stopWatch.ElapsedMilliseconds));

        stopWatch.Reset ();

    }

    private void ScreenSave(){

        //记住当前渲染纹理.

        var remeber = RenderTexture.active;

        //将相机的渲染结果设置为当前渲染.

        RenderTexture.active = rt;

        //读取

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

        byte[] bytes;

        bytes = screenShot.EncodeToJPG ();

        System.IO.File.WriteAllBytes (imagesPath + imageIndex +".jpg", bytes);

        //将之前的渲染纹理变成激活.

        RenderTexture.active = remeber;

    }

}

个人最喜欢这种方式，效率已经相当高了