Thank you for your help. Yes, it is 2D. I'll take a look at the article. My only concern is that my hexagons are 2d texture images so the math may not work quite as well as with a 2d primitive using math to display it. The other flip side is that I'm inexperienced at applying some of the math concepts to xna. If all else fails, I may just use a simple circle or rectangle check and leave it at that.