Aum 32 - 35 will help you out on this topic George is a great programmer and has helped people like you along this topic, depending on the detail you want and compared to things like RPG's yes it is easy to make a racing game on 3DGS here is the link for the AUM's look and see for yourself if you think it is easy or hard. Check out all of the Aum's here, you only want AUM's 32 through 35 for specifically racing games this is not all you can do but you can see some of the work that was needed to start this, he shows a number of methods of doing this if I remember right.