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

OBJECT SHARING SYSTEMS

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

Client A Objects Application Network Object-Sharing Client B Objects Application Network Object-Sharing

RAKNET

Client A ReplicaObjects Application ReplicaManager 1 2 Server ReplicaObjects Application ReplicaManager 4 Client C ReplicaObjects Application ReplicaManager Client B ReplicaObjects Application ReplicaManager

Client A ReplicaObjects Application ReplicaManager Server ReplicaObjects Application ReplicaManager 1 Client C ReplicaObjects Application ReplicaManager Client B ReplicaObjects Application ReplicaManager

BOIDS USING OBJECT SHARING

GENERAL OBJECT SHARING

OWNERSHIP

Client AClient BClient C

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

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

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

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

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

SCENE-GRAPHS, OBJECT-SHARING AND MESSAGES

SUMMARY