Unity screenshot method

Here is my summary 、 stay u3d Medium , Three screen capture methods ：

1、 Use Application Under class CaptureScreenshot Method .

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1. void CaptureScreen()   
2. {  
3.     Application.CaptureScreenshot("Screenshot.png", 0);  
4. }  

 

This method , What is intercepted is the picture of the whole game at a certain frame , Or a full screen shot .

a、 Not for a camera （camera） The picture of , A screenshot .

b、 Screenshot of partial screen , It's not convenient to implement , It's also inefficient , It is not recommended to use... In the project ：

although CaptureScreenshot What about this method , Don't do it yourself . But we can take the route of saving the country by curving to realize it . This is the idea ： You can use this method to capture a full screen first , Then get the screenshot through the path ; Next, we will use the related graphic classes to , Take a partial area of this screenshot and save it , So you can get a partial screenshot . I will not realize it here , But those who are interested can try , It must be possible .

2、 The method of this second screenshot is , Use Texture2d Class , It can also realize the screenshot function .

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1. /// <summary>  
2. /// Captures the screenshot2.  
3. /// </summary>  
4. /// <returns>The screenshot2.</returns>  
5. /// <param name="rect">Rect. The area of the screenshot , The lower left corner is o spot </param>  
6. Texture2D CaptureScreenshot2(Rect rect)   
7. {  
8.     //  First create an empty texture , The size can be set according to the implementation needs   
9.     Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);  
10.   
11.     //  The screen pixel information is read and stored as texture data ,  
12.     screenShot.ReadPixels(rect, 0, 0);  
13.     screenShot.Apply();  
14.   
15.     //  Then these texture data , Become a png Picture file   
16.     byte[] bytes = screenShot.EncodeToPNG();  
17.     string filename = Application.dataPath + "/Screenshot.png";  
18.     System.IO.File.WriteAllBytes(filename, bytes);  
19.     Debug.Log(string.Format(" Screenshot of a picture : {0}", filename));  
20.   
21.     //  Last , I return to this Texture2d object , In this way, we can directly , So this screenshot is illustrated in the game , Of course, according to their own needs .  
22.     return screenShot;  
23. }  

Cut a full-screen （ Here's the picture , notes ： Yes ui）：
CaptureScreenshot2( new Rect( Screen.width*0f, Screen.height*0f, Screen.width*1f, Screen.height*1f));

Cut the middle 4 Divided （ Here's the picture ）:
CaptureScreenshot2( new Rect( Screen.width*0.25f, Screen.height*0.25f, Screen.width*0.5f, Screen.height*0.5f));

Here are a few Texture2d Class method , There are also some points to pay attention to in use , See for yourself .

Of course , This method does not need to implement the function of screenshot for a certain camera . But key interfaces have emerged , It is Texture2d.ReadPixels(), Let's not talk about this paragraph , Let's look down ！

3、 This third method , The best , You can take a screenshot of a certain camera .

In this case , I can cut off , my Avatar What you see in the game scene ,UI Interface （ Use a special camera Show ） What is not supposed to be . Do that , We should separate them into one camera To display ui Interface , With another camera The camera displays the scene picture . then , We only take screenshots of the scene camera . So the key point is ： How to take a screenshot of a camera . A new class used here is RenderTexture.

The code is as follows ：

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1. /// <summary>  
2. ///  Take a screenshot of the camera .   
3. /// </summary>  
4. /// <returns>The screenshot2.</returns>  
5. /// <param name="camera">Camera. The camera to be screenshot </param>  
6. /// <param name="rect">Rect. Screen capture area </param>  
7. Texture2D CaptureCamera(Camera camera, Rect rect)   
8. {  
9.     //  Create a RenderTexture object   
10.     RenderTexture rt = new RenderTexture((int)rect.width, (int)rect.height, 0);  
11.     //  Temporarily set the of the relevant camera targetTexture by rt,  And manually render the relevant camera   
12.     camera.targetTexture = rt;  
13.     camera.Render();  
14.         //ps: ---  If you add a second camera , You can only take a screenshot of the image seen by several specified Cameras .  
15.         //ps: camera2.targetTexture = rt;  
16.         //ps: camera2.Render();  
17.         //ps: -------------------------------------------------------------------  
18.   
19.     //  Activate this rt,  And read pixels from it .  
20.     RenderTexture.active = rt;  
21.     Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);  
22.     screenShot.ReadPixels(rect, 0, 0);//  notes ： This is the time , It's from RenderTexture.active Read the picture in the middle school   
23.     screenShot.Apply();  
24.   
25.     //  Reset relevant parameters , To use the camera Continue to display... On the screen   
26.     camera.targetTexture = null;  
27.         //ps: camera2.targetTexture = null;  
28.     RenderTexture.active = null; // JC: added to avoid errors  
29.     GameObject.Destroy(rt);  
30.     //  Finally, these texture data , Become a png Picture file   
31.     byte[] bytes = screenShot.EncodeToPNG();  
32.     string filename = Application.dataPath + "/Screenshot.png";  
33.     System.IO.File.WriteAllBytes(filename, bytes);  
34.     Debug.Log(string.Format(" Screenshot of a picture : {0}", filename));  
35.       
36.     return screenShot;  
37. }  

I won't say more , Find the relevant information by yourself , Because I don't understand either ！

It goes straight to the picture above .

nothing ui Full screen view of ：

Only ui Full screen view of ：

Yes ui There is a full screen picture of the scene （ Only these two cameras are specified , The relevant tips are in the code “//ps” in ）：

Source :http://blog.csdn.net/anyuanlzh/article/details/17008909;