Original Post
After googling around I found this article:
http://www.acm.org/jgt/papers/MollerTrumbore97/code.html
I could just take the code and stick it in my program, but I do not understand it at all. I don''t want to become a copy and paste programmer 
. When I find myself doing it something always goes wrong and I have no idea what it is since I don''t even know what "my" code is doing. Are there any diagrams of what is going on in that algorithm so I can get an idea of what it does? I could also use some pictures that show what DOT and CROSS do. I can rewrite the formulas all day but I can''t visualize them. Thanks for the help.
. When I find myself doing it something always goes wrong and I have no idea what it is since I don''t even know what "my" code is doing. Are there any diagrams of what is going on in that algorithm so I can get an idea of what it does? I could also use some pictures that show what DOT and CROSS do. I can rewrite the formulas all day but I can''t visualize them. Thanks for the help.