Granules in OpenScad

What if I had a device that was capable of placing individual molecules of stuff within a 3D volume? What I need for tools is a volumetric rendering sort of thing. What?

This 'thing' is a set of simple tools that begin to build up a 3D/2D rendering library in OpenScad.

Of course, you already have Processing, and with a .stl exporter, what's the need of such a thing? It's just fun.

What can you do with it? Well, you do this in OpenScad:

include Render2D.scad

gPmm = 4; // How