[x3d-public] web3d MMO > avatar updates via DIS

[GPU Group]

https://freewrl.sourceforge.io/tests/28_Distributed_interactive_simulation/elevator/

https://freewrl.sourceforge.io/tests/28_Distributed_interactive_simulation/elevator/Elevator3_4players.png

MMO - massively multiplayer online
4 players (4 instances of freewrl with scene elevator3.x3d, and just the
'application' number changed for each one) and the viewpoint pose in world
space is transferred to the other app instance via DIS distributed
interactive simulation, via an internal function run once per frame that
gets the viewpoint-agnostic view matrix at world scene level and parses
into xyz and ypr and transmits as an EntityState pdu.
The elevator3.x3d scene has a DISEntityManager node and a Group node that
newly discovered entities are addChildrened / parented to
As one player navigates, the associated cone avatar pose is updated in the
other app instances.
In theory a regular web3d node could spit out DIS compatible geo coords and
ypr orientation. It needs to be viewpoint agnostic world space, so perhaps
singleton navigation info could do that. And then could be routed to an
Espdu node in the source scene, for relaying updates to other app
instances. And then wouldn't need the special function. But then we may
have hand-wand-controlled or walk/stand/run or arm-pointing articulation
parameters to relay in the future, so having a special function may be
helpful for all that.
-Doug
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