i am developing a little game. I need to put an A star pathfinding algorithm to put enemies who follows the player. I have already learned and tested a pathfinding algorithm, but it works with fixed-size array.

How can I turn a open world into a fixed-size array?? I am developing with Irrlicht engine 1.6 version. I know that it is a quite old, but it is the only engine who works for me in Windows XP. Thanks.

Here there is a link to the work I have done with Irrlicht: Just a walking person.

http://www.4shared.com/zip/Rli6BGGAce/Jesucristo_videojuego.html

Please put media folder in your C:\ drive. Thanks.