[Cthulhu_]

Reminds me a bit about a recent blogpost about KSP: https://www.kerbalspaceprogram.com/dev-diaries/6509/. Basically they draw circles as a fixed amount of points as well, but if you zoom enough the circle becomes straight lines. With some work, they're drawing more points on the visible part of the circle as you zoom in.

[jagged-chisel]

In 3D rendering, this is what subdivision surfaces are about. As the camera moves closer, produce more triangles to keep the model appearing smooth. Cool stuff.