There are the "pick" commands, EntityPick, LinePick, CameraPick, etc...
Also you could just keep track of the x,y,z of the paddles and the ball and consider a collision when the ball's position is within a certain distance of the paddle's position.
Also you could just keep track of the x,y,z of the paddles and the ball and consider a collision when the ball's position is within a certain distance of the paddle's position.