Graphics Reference
In-Depth Information
It still uses conception of simulation application, but it is called federation member
in great majority case. The conception of simulation practice is replaced by federation.
The federation is composed of many federation members, namely many simulation
applications. Run Time Infrastructure (RTI) is a new conception in HLA. From phys-
ical view, it is a kind of software that distributes in every simulation host machine of
HLA, like a distributed operation system. Every simulation application informs RTI
what data it will send or need by communicating with local RTI; then the RTI is re-
sponsible for communicating with other simulation application. So the information
exchange can be realized.
2.2
MMO
MMO is the network communication technology of large scale network game. MMOG
(Massively Multiplayer Online Game) system model consisting of a centralized
structure to a distributed architecture development is an inevitable trend[4]. In large
scale many player online game, it needs transmitting posture information such as po-
sition and speed between players. It has a greater communication flow. In order to solve
this problem, MMO designs several mechanisms to decrease the communication flow
and reduce the network load. Generally, this mechanism is called MMO communica-
tion mechanism. With the use this mechanism, the network load which was produced
by transmitting above information between players in game scene can be effectively
reduced. According to characteristic of the network game, like big communication
flow, high need of real time, it usually uses UDP mode on agreement, but the com-
munication architecture is different between games based on its own requirement and
characteristic. Currently, the P2P structure is a widely using structure. Paper also uses
UDP agreement and P2P structure in realization.
Peer-to-Peer computing is a study hotspot recently. The characteristic of the
peer-to-peer computing is that it deals better with server computing bottleneck prob-
lems of C/S mode, the computing capability of system is decided by the sum of all node
computing capability. Since every peer represents an equal node, no one has any pri-
vilege, therefore, there is no total data control ability. The virtual source of player is
stored in local node, but the safety can't be well ensured. In theory, with the joining of
more and more peer, the system computing capability will be increased and the
availability will be enhanced, but the communication volume of the entire system will
be increased by n2, of course, we can use some technology like interest management to
make improvement [5].
3
Application Analysis of MMO Mechanism in DIS Visual
Simulation
3.1
Requirement of Real Time
The Real time is one basic characteristic of DIS visual simulation. It requires trans-
mission of a big size of data such as words, image, sound and position in time in the
Search WWH ::
Custom Search