World Streaming multiplayer

Optional WorldStreaming.Multiplayer synchronizes cell and layer interest between dedicated server and clients. Server shards (authority ownership) are not the same as editor collaboration shards.

Integration checklist

Build with the Multiplayer Gem present so WorldStreaming.Multiplayer compiles.
Place WorldStreamingSyncNetworkComponent on the networked player Prefab. Without it, clients do not receive activation authority.
Ship the same Manifest on server and clients (worldGuid + manifestVersion + contentHash handshake). Mismatch → reject; client gets zero authorized cells.
Configure authority mode, interest CVars, and optional server shards.

Server authority modes

`Runtime/ServerAuthority`	Semantics
`ServerDriven` (default)	Local client sources may warm cells only up to Loaded; Activated requires server authorization
`ClientPredicted`	Clients may load/activate static content themselves; networked entities remain server-authoritative

Query from script: IsServerAuthorityEnforced / GetServerAuthorizedCellCount.

State sync and interest

The sync component carries cell / layer state server → client. The server filters relevant cells by interest:

CVar / setting	Default	Role
`sv_worldStreamingInterestUpdateMs`	250 ms	Interest refresh period
`sv_worldStreamingInterestRadius`	512 m	Interest radius
`sv_worldStreamingPeriodicSnapshotPushes`	20	Periodic snapshot pushes
`ws_entityCellRefreshMs`	0 (off)	Entity→cell refresh
`ws_gateReplicatedEntitiesOnCellLoaded`	`false`	Gate replication on cell Loaded
`m_maxReplicatedEntitiesPerConnection` / `m_perCellReplicationBudget`	0 / 0	Replication budgets (0 = off)
`FilterForcedRelevantByCell`	`false`

Replication-load gate: unexpected / Failed / HLOD cells always pass (no deadlock). Client NetworkEntityTag alias Disable: networked entities arrive only via replication.

Network instantiation modes

Runtime/NetworkInstantiationMode:

Value	Semantics
`StaticAliasAutoInstantiate` (default)	Replace-alias auto-spawns networked entities
`ExplicitNetSpawn`	Explicit network spawnable; spawn = activate (single tier)
`ExplicitImmediateSpawn`	`CreateEntitiesImmediate(DoNotActivate)`; supports two-tier activation + double-precision anchors

Server residency

Runtime/ServerStreamingMode: StreamInOut (default) / StreamInOnly / FullyResident.

Server shards (multi-authority)

Distinct from editor shards:

Set .wsworld m_shardSize > 0 at bake time.
Configure OwnedShardCoords in setreg (for example "0,0;1,0").
Set ws_installCellEntityDomainOnHost = true on hosts that own cells.
sv_worldStreamingShardAuthorityUpdateMs default 500 ms.

Query: GetCellShardAtPosition / IsCellOwnedByThisServerAtPosition (script) or C++ GetCellShard / IsCellOwnedByThisServer.

Content Layer network roles

Layers may be ClientOnly or ServerOnly and are clamped by the local network role. See Content Layers.

Content Bundles in multiplayer

Mount state is not in the handshake. ServerDriven clients should mount the same bundles as the server. Chunked roots cannot mount bundles (v1).

Next steps

Scripting: multiplayer query events.
Configuration and debugging: full CVar table.