How to render curves

A simple question, yet I have problems with it. How do I render curves (bezier, path). I make the line, apply a halo material hit f12 but it renders nothing.

Halos only works on vertices as far as I know, so you have to convert your curve to a mesh first.
But if you want to render a line you can giv the curve some volume by activating the 3D option and deactivating Front and Back and giving the curve some beveldepth in the Editbuttons.

oh, I see. And is there a way to convert lines to meshes at render time, so I could have an animated line growing with the halo material?

I don’t know what you want to do, but you could for example control a MeshTube with a CurveModifier.

You could try my After Effect stroke emulator.