Study on MMO in Visual Simulation Application - Advances in Image and Graphics Technologies - page 246

In a word, supposing that at time t, entity node 2 discovers object entity node 1
(namely 1 goes into visual field of 2), the entity 1 doesn't discover the entity 2. From
this time, entity 1 should give own state information to entity 2. At the entity 2 position,
the visual retention of human is 24 frames per second, so it should transport 24 times
position information that the image display which we are observing don't be get stuck.
If entity 1 runs from point m to point n using 4 seconds, it needs to transport 96 times
position information. By using DR algorithm, under the effect of forecast mechanism,
if it needs to transport 10 times state information per second, so the entity 1 just needs
to transport 40 times state information during its moving procedure. The communica-
tion time is 2/5 of the old. If we use the better DR algorithm, we will get even a better
result.

4

Example of DIS Visual Simulation Experiment with MMO

In DIS, nodes communicate with each other through the P2P structure, whether in-
formation that is useful is decided by receiver. If the information has no value for
receiver itself, it will be deleted, so it may waste bandwidth of information transmission
network. With the increasing of simulation node, communication data will increase
exponentially. This data transmission occupies limited network bandwidth, so the real
time of communication interaction data can't be effectively assured. Based on this
fault, the above mentioned visual field partition interaction range method was used in
examples, when the node needing communication with others, sender confirms inte-
raction objects according to its visual field range, excluding unrelevant entity node to
interaction range through the game engine or 3D visual simulation engine mature view
of field calculate function. The network flow load during DIS network data transmis-
sion process will reduceits availably. Figure 5 shows its flow diagram and specific
realization project design.

Fig. 5 . Process of Interaction range of visual field partition