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SDK 0.4.14
SDK 0.4.14
  • Welcome
  • Overview
    • What is coherence?
    • How does coherence work?
    • Features and Roadmap
    • Requirements
  • Get Started
    • Install coherence
    • Scene setup
    • Prefab setup
    • Build and run
    • Baking and code generation
    • Create a free account
    • Deploy and share
  • Authority and communication
    • How authority works
    • Authority transfer
    • Commands
    • Server-side and input queues
    • Animations
  • Persistence
    • Overview
    • Configuring persistence
    • Storage
    • Example – A global counter
  • Optimization
    • Overview
    • Simulation frequency
    • Areas of interest
    • World size
    • Level of detail
    • Interpolation
    • Extrapolation
  • Connected entities
    • Overview
    • Entity references
    • ConnectedEntity component
    • Parent-child relationships
  • Simulators
    • Overview
    • Client vs. simulator logic
    • Build and deploy
    • Simulator load balancing
  • Tutorial project
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    • Start Tutorial
      • 1. Transforms
      • 2. Physics
      • 3. Persistence
      • 4. Animation and Variables
      • 5. AI Navigation
      • 6. Network Commands
      • 7. Network Events
  • Game Services
    • Game account
    • Key-value store
    • Matchmaking
  • API reference
    • Network SDK
      • CoherenceSync
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      • Archetype
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      • Settings Window
    • Cloud API
      • API tokens and keys
      • Server discovery
      • Game account
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      • Matchmaking
    • Replication Server
    • Simulation Server
    • Entity Component System
      • Network Entities and Components
  • Schema reference
    • Overview
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  • Additional information
    • Pricing
    • SLA
    • Unreal Engine support
    • Peer-to-Peer (P2P)
    • Known Issues
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  • Client Authority
  • Server Authority
  • Remote Communication

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  1. Authority and communication

How authority works

Last updated 4 years ago

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Networked entities can be simulated either on a game client ("client authority") or a simulation server ("server authority).

Client Authority

Client authority is the easiest to set up initially, but it has some drawbacks:

  • Higher latency. Because both clients have a non-zero ping to the replication server, the minimum latency for data replication, commands and events is the combined ping (client 1 to replications server and replication server to client 2).

  • Higher exposure to cheating. Because we trust game clients to simulate their own entities, there is a risk that one such client is tampered with and sends out unrealistic data.

In many cases, especially when not working on a competitive PvP game, these are not really issues and are a perfectly fine choice for the game developer.

Client authority does have a few advantages:

  • Easier to set up. No client vs. server logic separation in the code, no building and uploading of simulation servers, everything just works out of the box.

  • Cheaper. Depending on how optimized the simulator code is, running a simulator in the cloud will in most cases incur more costs than just running a replication server (which is comparatively very lean).

Server Authority

Having one or several simulators taking care of the important world simulation tasks (like AI, player character state, score, health, etc.) is always a good idea for competitive PvP games.

Running a simulator in the cloud next to the replicator (the ping between them being negligible) will also result in lower latency.

The player character can also be simulated on the server, with the client locally predicting its state based on inputs. You can read more about how to achieve that in the section .

Peer-to-peer support (without a replicator) is planned in a future release. Please see the for updates.

Remote Communication

Even if an entity is not currently being simulated locally, we can still affect its state by sending a , network events or even .

input queues
Peer-to-peer page
network command
requesting a transfer of authority