Takes a path + filename + extension and removes path and extension to return only the filename.

Takes a path + filename + extension and removes path to return only the filename and extension.

From: http://en.wikipedia.org/wiki/HSL_and_HSV#General_approach

http://youtu.be/A6A0rpV9ElA

This method gets called when the user presses a key

This method gets called when the player releases a key.

This method is called every time the player moves the mouse

Since we're mucking around with matrices so much, the basis vectors can sometimes get slightly longer or shorter than unit length because of floating