Quick screenshot question

Hi. Sorry for posting yet another screenshot question, but nothing I found in other posts satisfied me.

I'm trying to make a Screenshot function. Here is my code :

Code (csharp):

1. // Copy pixels to a 2D texture
2. RenderTexture.active = thisCamera.targetTexture;
3. exportTexture.ReadPixels(new Rect(0, 0, thisCamera.targetTexture.width, thisCamera.targetTexture.height), 0, 0, false);
4. exportTexture.Apply(false);
5.  
6. // Resize to correct ratio
7. exportTexture.Resize(screenshotWidth, screenshotHeight);
8. exportTexture.Apply(false);
9. Debug.Log(exportTexture.width + " x " + exportTexture.height);
10.  
11. // Convert pixels as a byte array and write it to a PNG file
12. exportBytes = exportTexture.EncodeToPNG();
13. File.WriteAllBytes(exportPath, exportBytes);
14.  
15. // Deactivate render texture
16. RenderTexture.active = null;

Reading pixels from RenderTexture is OK. And writing them to file (without resizing) is OK.
But if I uncomment the two resizing lines, it makes the resulting PNG file entirely black. The resolution though, is correctly set and the Debug.Log line shows the correct one (i.e. 1920 x 1080).

Does someone see what's wrong ?

Thanks a lot.

 

http://answers.unity3d.com/questions/42753/resizing-a-screenshot-mobile.html#answer-148189