ReadPixels was called to read pixels from system frame buffer, while not inside drawi

Unity Engine
,
1

Please bear with me as I’m new to Unity. I’m using Vuforia and the Prime31 Etcetera plugin and am trying to email a screenshot of the application on an Android device. Vuforia works fine, sending an email works fine, but as soon as I try to create the screenshot LogCat shows me:

ReadPixels was called to read pixels from system frame buffer, while not inside drawing frame.

This is the code I’m using:

void SendAndroidEmail() {
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();
        byte[] bytes = tex.EncodeToPNG();
        Destroy(tex);
		
		var path = System.IO.Path.Combine( Application.persistentDataPath, "tmp_" + System.DateTime.Now.ToString() + ".png" );
		System.IO.File.WriteAllBytes( path, bytes );

		EtceteraAndroid.showEmailComposer( "noone@nothing.com", "Message subject", "click <a href='http://somelink.com'>here</a> for a present", true, path );
}

I have tried experimenting with yield but to no avail as I’m not sure what I’m doing…

Thanks!

1 Like
2

I was able to get the screenshot by moving the code above from ‘Update’ to ‘LateUpdate’. But unfortunately then in the the screenshot I can only see the camera image with the marker (or target), but not the model rendered on top of that…

Is there some other place I need to execute this code form to get both the model and the camera image?

1 Like
3
1 Like
4

Thank your very much! OnPostRender did the trick.

3 Likes