Nice page, and wonderfull java applications, can you send me more information or links, I would like to make a simulation in java for the Table Tennis Ball, as a proyectile and the efect in the movement for the spin (rotation). I'm table tennis player, usually when you put more spin in the ball, then the ball get a less distance to touch the table. For that reason in high level , the table tennis player put an strong spin in the ball, to make sure don't loss the point. mauricio_vergara6401@yahoo.com Please send me information to do this in java. Thanks