PongAR

Multi-user is important in Augmented Reality to share experiences

• Each user controls a cube
• A red capsule goes back and forth between the first and second user cubes
• A web server manages ip addresses for use over a LAN
• A heartbeat call to the server is made every 3 sec for each user
• Each user has a list of other ips
• Each user sends cube position and orientation to each ip each frame
• Each user receives other cube positions and orientations and updates game objects each frame
• Low latency

Web Server PHP

• upload_ip.php takes three arguments and is called by the Unity app
• ip, device, timestamp are the arguments
• Each Unity app calls every 3 seconds, timeout is 5 sec
• Each call checks for expired (elapsed time > 5sec) and removes entries
• Current caller's data is added
• List of ips is returned delimited by ":"
• Heartbeat calls update the active ip list
• Heartbeat accomplishes network discovery on a local network using a web server
• Game object position is sent to one or more ip's
• Positions and orientations of remote ip's are received and game objects are updated
• Each Unity app updates game object positions and orientations