I decided to upload a few pictures related to the paddle movement and some shadow effects that were created to help the user know the position of the ball and paddle in the 3D space.

The following were taken with one client running:

Fig. 1- In this picture the face is centered inside the circle so the paddle isn't going to move

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

As you can see, in Fig. 6, when the paddle comes closer to the ground a shadow starts to appear. This lets the user know if he's too close to the ground and also aids to know if he is in the same height as the ball or not. Also, in Fig.5, you can see that there is no shadow this was done to increase the level of difficulty and so it becomes more realistic. The shadow starts to fade when the user's paddle is closer to the ceiling of the game space.

Another thing added to improve the user experience is the arrows that light up to show where the paddle will move. This was done so that the user doesn't have to look to the video feed to know where he is. This way he can concentrate exclusively in trying to hit the ball.

Since this is a multiplayer game I'll add more pictures and videos regarding multiplayer gaming experiences.