对相机所看的视角截屏保存为图片

对相机所看的视角截屏保存为图片：

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
/// <summary>
/// 对相机截图
/// </summary>
public class Jietu : MonoBehaviour {

    public Camera camera;
    Texture2D tex;
    void Start()
    {
            tex= CaptureCamera(camera,new Rect(0,0,Screen.width,Screen.height));
            GameObject.Find("Canvas/Image").GetComponent<Image>().sprite=Sprite.Create(tex, new Rect(0, 0,tex.width,tex.height), new Vector2(0.5f, 0.5f));
    }
    Texture2D CaptureCamera(Camera cam,Rect rect)
    {
        //创建一个RenderTexture对象
        RenderTexture rt=new RenderTexture ((int)rect.width,(int)rect.height,0);
        //临时设置相关相机的targetTexture为rt，并手动渲染相关相机
        cam.targetTexture=rt;
        cam.Render();
        //ps: --- 如果这样加上第二个相机，可以实现只截图某几个指定的相机一起看到的图像。  
        //ps: camera2.targetTexture = rt;  
        //ps: camera2.Render();  
        //ps: -------------------------------------------------------------------  

        // 激活这个rt, 并从中中读取像素。  
        RenderTexture.active = rt;  
        Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);  
        screenShot.ReadPixels(rect, 0, 0);// 注：这个时候，它是从RenderTexture.active中读取像素  
        screenShot.Apply();  

        // 重置相关参数，以使用camera继续在屏幕上显示  
        camera.targetTexture = null;  
        //ps: camera2.targetTexture = null;  
        RenderTexture.active = null; // JC: added to avoid errors  
        GameObject.Destroy(rt);  
        // 最后将这些纹理数据，成一个png图片文件  
        byte[] bytes = screenShot.EncodeToPNG();  
        string filename = Application.dataPath + "/Screenshot.png";  
        System.IO.File.WriteAllBytes(filename, bytes);  
        Debug.Log(string.Format("截了一张照片: {0}", filename));  
        return screenShot;  
    }
}

转载一下，以备后用。