Circle gradient 3D2D camera effect

Hello, i’m trying to make an objective thingy in my gamemode. I want to re-create this in garry’s mod:

(the little red gradient circle)

How would I achieve this effect?
I was thinking of having an entity with no collision and invisible model, no shadows and draw 3D2D around it, but is there an easier way? Thank you.

This isn’t a task for 3D2D, easiest way to do this is to use a model.

Didn’t think about that, but if I were to do it a different way, how would I do it?

you could use an iMesh for this to make a triangle structure in the shape of a circle with proper u,v tex coordinate mapping and then draw it with gradient mat.