The history of this function: http://www.beyond3d.com/content/articles/8/ http://www.beyond3d.com/content/articles/8/ Finding the original author of the functi

The history of this function: http://www.beyond3d.com/content/articles/8/ http://www.beyond3d.com/content/articles/8/ Finding the original author of the function (Greg Walsh): http://www.beyond3d.com/content/articles/15/ http://www.beyond3d.com/content/articles/15/