Deborah R. Fowler
RayTracing in C++
Updated on Jan
9 2013 Thank you to Zephyr Mann for sharing his collection of useful links.
http://www.cs.unc.edu/~rademach/xroads-RT/RTarticle.html
http://iquilezles.org/www/index.htm
http://scratchapixel.com/
http://www.codermind.com/articles/Raytracer-in-C++-Part-I-First-rays.html
http://www.upvector.com/?section=Tutorials&subsection=Intro%20to%20Shaders
http://joomla.renderwiki.com/joomla/index.php?option=com_content&view=article&id=81&Itemid=54
http://escience.anu.edu.au/lecture/cg/Illumination/lambertCosineLaw.en.html