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Actor presence

Goal​

Move a dot with the mouse and see other players' dots in realtime.

Send loop​

Send sendActorUpdate at ~10 Hz with your world X/Y encoded in actor state (see Actor state layout).

await client.udp.sendActorUpdate({
  appId: '1',
  chunk: { x: '0', y: '0', z: '0' },
  uuid: actorUuid,       // 32 UTF-8 bytes
  state: encodeActorState({ worldX, worldY, pushFlags: 0 }),
  sequenceNumber: seq,   // 0–255, wraps
});

client.udp.* runs on the app-scoped token from chapters 2–3; the identity session token is rejected for gameplay.

Receive​

On ActorUpdateNotification, decode state and render a dot for each remote UUID (skip your own).

Multiplayer test​

Open two browser tabs. Each tab should show the other's dot within ~200 ms on the dev tier.

Exit criteria​

  • Local dot follows mouse
  • Remote dots visible in second window

Next: Painting voxels