Screenshot Capture

Hi,

I have simple function that uses
Camera.Render() and a RenderTexture to get a screenshot. This is works perfectly while unity is running
on Editor mode. I want to run it offline, I want unity to start, take a snapshot and exit. I have tried to use
-executeMethod or implementing [InitializeOnLoad] class and call the function.
Non of that works. I'm getting the same results as if I were disable the call to Camera.Render().
So it looks like the Camera.Render() is not working.
How can I make it work?
Tnx

 

I noticed that Camera.PixelRect is 0,0,0,0. When I'm setting it with new rect with legal resolution, it remains 0,0,0,0.
Unity Guys how can I make to work?