对相机所看的视角截屏保存为图片

 1 using UnityEngine;
 2 using System.Collections;
 3 using UnityEngine.UI;
 4 /// <summary>
 5 /// 对相机截图
 6 /// </summary>
 7 public class Jietu : MonoBehaviour {
 8 
 9     public Camera camera;
10     Texture2D tex;
11     void Start()
12     {
13             tex= CaptureCamera(camera,new Rect(0,0,Screen.width,Screen.height));
14             GameObject.Find("Canvas/Image").GetComponent<Image>().sprite=Sprite.Create(tex, new Rect(0, 0,tex.width,tex.height), new Vector2(0.5f, 0.5f));
15     }
16     Texture2D CaptureCamera(Camera cam,Rect rect)
17     {
18         //创建一个RenderTexture对象
19         RenderTexture rt=new RenderTexture ((int)rect.width,(int)rect.height,0);
20         //临时设置相关相机的targetTexture为rt，并手动渲染相关相机
21         cam.targetTexture=rt;
22         cam.Render();
23         //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。  
24         //ps: camera2.targetTexture = rt;  
25         //ps: camera2.Render();  
26         //ps: -------------------------------------------------------------------  
27 
28         // 激活这个rt, 并从中中读取像素。  
29         RenderTexture.active = rt;  
30         Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);  
31         screenShot.ReadPixels(rect, 0, 0);// 注：这个时候，它是从RenderTexture.active中读取像素  
32         screenShot.Apply();  
33 
34         // 重置相关参数，以使用camera继续在屏幕上显示  
35         camera.targetTexture = null;  
36         //ps: camera2.targetTexture = null;  
37         RenderTexture.active = null; // JC: added to avoid errors  
38         GameObject.Destroy(rt);  
39         // 最后将这些纹理数据，成一个png图片文件  
40         byte[] bytes = screenShot.EncodeToPNG();  
41         string filename = Application.dataPath + "/Screenshot.png";  
42         System.IO.File.WriteAllBytes(filename, bytes);  
43         Debug.Log(string.Format("截了一张照片: {0}", filename));  
44         return screenShot;  
45     }
46 }