Study on MMO in Visual Simulation Application - Advances in Image and Graphics Technologies - page 243

has different visual field, and its distribution is not equal. Therefore, we can use the
method of visual field partition interaction range to divide space, namely every entity
node has its own visual field space and has its own interaction objects because the
entity doesn't need to communicate with all nodes in the space.
We assume that there are three entity node, tank, armored car and soldier. If we don't
consider the interaction range, all possible interaction would be as in figure 1.
Fig. 1 . Possible Interaction of Entities
We can use the visual field partition method to confirm the interaction range as
figure 2 shows. The radiuses of visual field ranges are 2500m, 1800m, 1000m, among
them, tanks and armored vehicles were observed by sight certain magnification, the
soldiers were observed only by the naked eye, and they are moving from faraway place.
When soldier moves to the tank orientation and enters into the tank visual field, the
distance between them is 2500m, but the tank is 1500m away from the soldier's furthest
visual field border at this time, so, we just need to transmit the solder's entity node
simulation information to the tank, and the tank doesn't need to transmit the informa-
tion to the soldier, as figure 2 shows.
Fig. 2 . Interaction range of visual field partition
Virtual scene corresponding to the display as shown in figure 3: