Let's not forget that he was not the first to come up with this technique. From wikipedia [1]: William Bilodeau and Michael Songy discovered this technique in

Let's not forget that he was not the first to come up with this technique. From wikipedia [1]: William Bilodeau and Michael Songy discovered this technique in October 1998, and presented the technique at Creativity, a Creative Labs developer's conference, in 1999.[2] Sim Dietrich presented this technique at both GDC in March 1999, and at Creativity in late 1999.[3][4] A few months later, William Bilodeau and Michael Songy filed a US patent application for the technique the same year, US 6384822 , entitled "Method for rendering shadows using a shadow volume and a stencil buffer" issued in 2002. John Carmack of id Software independently discovered the algorithm in 2000 during the development of Doom 3.[5] Since he advertised the technique to the larger public, it is often referred to as Carmack's Reverse. [1] http://en.wikipedia.org/wiki/Shadow_volume http://en.wikipedia.org/wiki/Shadow_volume