You can render Particles along splines.
Splines actually don’t render (and that is the real beauty of them, lots of power, at little cost).
What you might want to consider, is that when it’s time for the redndering of a circle to occur, you can always ask the spline, what is the local or world position for a given distance along a spline, then from this start rendering your lines, or whatever it is you wish to render.
Is there any way to render a line using splines? I’ve created a perfect circle using splines and cannot find a way to render a line in its position. I’m trying to create something a galaxy map where the circle is the path of the planets.