[OpenSCAD] how to dimension?

[David Rysdam]

n00b here. 

In the wikibook, there's one reference to dimensioning and I don't get
it. Can someone tell me how I can take a 3D model and make a printout of
3 orthographic views with dimensions? Automatically would be awesome,
but at the very least a human choosing the views would probably be
necessary.

btw, I love how the external editor feature works. The only downside I
saw to OpenSCAD was that the editor wasn't emacs. And now it is!