This is an awesome post by a1k0n, finally explaining how the donut works: http://a1k0n.net/2011/07/20/donut-math.html

For those of you new to Vendetta, a1k0n used to be one of the devs (well known for flying around in Furies and infinite-health short busses during the days of alpha). One of his greatest contributions was to open-source VO: http://a1k0n.net/code/vosource.c.txt

Awesome. Thanks for posting the link, roguelazer.