Is there a way to draw something in Viewport. I'd like to extend the "Thirds Guide" approach. The image I render will have some margins in post-render, so I would like to see them in when composing. Ideally I'd like to be able to do rounded rectangle, oval, and anything else, but just set of vertical and horisontal guidlines would be good enough. Is there any access to such things as the "Thirds Guide" in Viewport?
Thanks.