The DIS (Distributed Interactive Simulation ) network software architecture
is a direct descendent from SIMNET but has packets that are more general than
SIMNET’s.
DIS has the same three basic components
an object-event architecture
notion of fully distributed simulation nodes
embedded set of predictive modelling algorithms for “dead reckoning”
Each Event is a packet sent over the network called a Protocol Data Unit :
PDU
The form of a PDU is standardised :
144 bytes in length and contains the information necessary to manage entity
state for the various players.
Identification of the player, player's location, orientation, velocity acceleration,
any articulation information for the player, any dynamic information about the
player that need to be communicate.
Other hypothesis : Graphics performance - 30 frames per second.
Thanks to predictive modelling algorithms, there is no need to systematically
send a PDU every frames