1. Networked Graphics Building Networked Virtual Environments and Networked Games Chapter 8: Middleware and Object-Sharing Systems

2. OBJECT SHARING SYSTEMS

3. Client A Objects Application Network Object-Sharing Client B Objects Application Network Object-Sharing Shared Objects

4. Client A Objects Application Network Object-Sharing Client B Objects Application Network Object-Sharing 1 2 3 4

5. RAKNET

6. Client A ReplicaObjects Application ReplicaManager 1 2 Server ReplicaObjects Application ReplicaManager 4 Client C ReplicaObjects Application ReplicaManager Client B ReplicaObjects Application ReplicaManager 3 5 5 6 6

7. Client A ReplicaObjects Application ReplicaManager Server ReplicaObjects Application ReplicaManager 1 Client C ReplicaObjects Application ReplicaManager Client B ReplicaObjects Application ReplicaManager 2 2 3 3

8. BOIDS USING OBJECT SHARING

9. GENERAL OBJECT SHARING

10. OWNERSHIP

11. Client AClient BClient C

12. Client AServer Client B Request Move Object O to XYZ Move Object O to XYZ Client A attempts to move Object O to XYZ Object O moves to XYZ Server authorizes move

13. Client AServer Client B Request Move Object O to XYZ 2 Move Object O to XYZ 2 Client A moves Object O from XYZ 1 to XYZ 2 Client A confirms moves Object O moves to XYZ 2 Server authorizes move

14. Client AServer Client B Request Move Object O to XYZ 2 Reject Movement Client A moves Object O from XYZ 1 to XYZ 2 Client A moves Object O from XYZ 2 back to XYZ 1 Server refuses move

15. Client AServer Client B Request Lock Object O Grant Lock Object O Client A requests lock on Object O Client A gets lock and makes move to XYZ 1 Object O moves to XYZ 1 Server grants lock Move Object O to XYZ 1 Client A makes move to XYZ 2 Object O moves to XYZ 2 Move Object O to XYZ 2

16. Client AServer Client B Request Lock & Move Object O to to XYZ 2 Grant Lock Object O Client A requests lock and move Object O from XYZ 1 to XYZ 2 Client A gets lock and makes move to XYZ 2 Object O moves to XYZ 1 Server grants lock Move Object O to XYZ 1 Object O moves to XYZ 2 Move Object O to XYZ 2

17. SCENE-GRAPHS, OBJECT-SHARING AND MESSAGES

19. SUMMARY