🚀 go-pugleaf

I am sure I am missing something, but I open myself to abuse by asking a  
potentially stupid question:

How do you draw lines, arcs, or other curves in the 3Dkit?

I thought RenderMan would have a standard way to get "zero thickness" objects  
like the way PostScript has strokes of 0 width -- It does the finest line  
possible on the device.  But the "RenderMan Companion" doesn't act like people  
draw lines, and I am confused.

Do I just do PostScript, pumping my own points through the 3DCamera's  
transform?  Use small cylinders? Polygons?

Please no news on The Theory of Renderman, etc.  I understand the high-end  
goals.  But I was under the impression that the 3Dkit would do a lot of the 3D  
transforms for me.  People even said, "Think of it as 3D PostScript".

I hope I'm missing something.
--J Gregory