Defeating lag in network-distributed physics simulations

[Display omitted] Shared worlds for distributed games, simulations, and VR/AR rely on intuitively “good-enough” depictions of shared world state currently limited by the belief that it is impossible to maintain identical shared state across a real-time distributed network. This prevents repeatable,...

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Bibliographic Details
Published in:Graphical models 2020-09, Vol.111, p.101075, Article 101075
Main Authors: Peitso, Loren, Brutzman, Don
Format: Article
Language:English
Subjects:
Asynchronous discrete event simulation (ADES)
Lag
Latency
Shared state
X3D graphics
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Summary:[Display omitted] Shared worlds for distributed games, simulations, and VR/AR rely on intuitively “good-enough” depictions of shared world state currently limited by the belief that it is impossible to maintain identical shared state across a real-time distributed network. This prevents repeatable, verifiable results for decision-making support, safety-related and/or equipment-in-the-loop simulations, or multi-user virtual/augmented reality. A network-distributed simulation architecture is presented which maintains consistent distributed state with known maximum bounds on the duration of transient state divergence due to external input. The key concept is computing simulation events slightly early so that they arrive just-in-time to other nodes in the distributed system. This works for all events where the data resides fully within the simulation model. A procedure is provided to eliminate any state divergence caused by external inputs, which to date has been considered impossible. Providing consistent distributed dynamic shared state enables repeatable, verifiable results for all distributed simulation applications.
ISSN:1524-0703
1524-0711
DOI:10.1016/j.gmod.2020.101075