For this night I decided to experiment with Polar Coordinates.
Here is how I wired things up on the Shader
To be honest, I copied some of it from you, from one of yours Screenshots you sent here: Most common / Bread & Butter Shaders and Materials "techniques"? - #24 by Sig
I’m heading to bed now, but how would you go about making it rounded? I aim to project it on the ground using Horizontal Billboard, but no way I can leave it looking like a quad!