I released an open source volumetric raytracer (after some discussions I
found out that volumetric raytracer is the most correct name for it), the
project is called Trixel and it's on sourceforge here:
http://sourceforge.net/projects/trixel

It would be cool if someone added a feature, or just gave me some comments
on the coding style.

(btw it's the same thing as the cube posts I made here as hybrid6666, but
this time open
source)