Great one: http://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm http://www.iquilezles.org/www/articles/distfunctions/distfun... Just go to hi

Great one: http://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm http://www.iquilezles.org/www/articles/distfunctions/distfun... Just go to his articles section and you'll see a bunch more.