Object Intersection Routines

http://www.realtimerendering.com/intersections.html – website for book real time rendering (Tomas Akenine-Möller, Eric Haines, and Naty Hoffman), containing number of intersection routines for different object types

http://fileadmin.cs.lth.se/cs/Personal/Tomas_Akenine-Moller/raytri/ – variations of Moller Trumbore