Blend node oriented "to window"

Is there an option for a blend node which allows me to set it up against the view window? I am after something like they used to do in movies to show dark atmosphere; overlaying a dimmed gradient from the top of the screen (the sky) fading downwards by the time it hits the horizon.

make a material with a blend texture. use that as a node.

Sorry… you’ve lost me there.
Could you please elaborate on the steps… especially how to apply it to the view/render window?

Hang on - I think I got what you mean now… like this… (attached file)

Thanks.

Attachments

vertical_mist_node.blend (36.6 KB)