I want to get this material that works similar to the Layer weight shader, but I can't get the effect I want.
I want to have a plane that is largely transparent with emission boundaries. I have attached a diagram that shows the basic idea, along with a basic idea of what shader basis I have going. This material needs to work well with a non-square plane. The sphere needs to be able to be stretched/manipulated to fit any shape, even if that means one side of the ellipse is wider than the other side.