Screen capture on 2nd camera using RenderTexture not working on Android

When trying to take a screen grab from a 2nd camera in my project, this image is then set on a texture in the UI.

This works in the Unity Editor, but when building for Android and running on an Android device, the screen capture is always from the main camera, and never the 2nd camera. Has anyone come across this issue before?

Thanks for your help in advance.


Test project can be found at here:- https://www.dropbox.com/s/ttwc5hzu2634pm7/TestScreenGrab.zip?dl=0

This is what it should look like, taken from Unity Editor :- https://www.dropbox.com/s/dfbqk2x89bix8nw/screenshot.PNG?dl=0


Code used to take the screenshot :-

Code (CSharp):

1.  
2. public void ButtonClicked()
3. {
4.     var screenshot = TakeScreenShot();
5.     image.texture = screenshot;
6. }
7.  
8. private Texture TakeScreenShot()
9. {
10.     var renderTexture = new RenderTexture(Screen.width, Screen.height, 24);
11.     screenshotCamera.targetTexture = renderTexture;  
12.     RenderTexture.active = renderTexture;
13.     screenshotCamera.Render();
14.  
15.     // texturize rendering
16.     float leftOffset = (Screen.width - Screen.height)/2f;
17.     var screenshot = new Texture2D(Screen.height, Screen.height, TextureFormat.RGB24, false);
18.     screenshot.ReadPixels(new Rect(leftOffset, 0, Screen.height, Screen.height), 0, 0);
19.     screenshot.Apply();
20.  
21.     screenshotCamera.targetTexture = null;
22.     RenderTexture.active = null;
23.  
24.     // return shot
25.     return screenshot;
26. }
27.  

 

Can anybody help with this please?

 

Problem solved. For some reason Android doesn't like it if you specify the activeTexture before you call render on the camera.

So change :-

Code (CSharp):

1. var renderTexture = new RenderTexture(Screen.width, Screen.height, 24);
2.     screenshotCamera.targetTexture = renderTexture;
3.     RenderTexture.active = renderTexture;
4.     screenshotCamera.Render();
5.  

to :-

Code (CSharp):

1. var renderTexture = new RenderTexture(Screen.width, Screen.height, 24);
2.     screenshotCamera.targetTexture = renderTexture;
3.     screenshotCamera.Render();
4.  
5.     RenderTexture.active = renderTexture;
6.  

 

I just would like to thank U. It also solved my problem. Thanks

 

Big thanks from me as well. Unity staff should look into this!