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How to use snapshots

You must generate a snapshot as the starting point for your SpatialOS world when you create a new GDK project.

To generate a snapshot, on the SpatialOS GDK toolbar in the Unreal Editor, select Snapshot.

Snapshot

Image: The GDK toolbar

This creates a snapshot called default.snapshot which you can find in spatial\snapshots.

If you want your snapshots to be exported to a different path you can specify the output path and file name of the snapshot using the GDK toolbar settings.

Critical entities

Critical entities are listed in snapshots by default.

Critical entities are required for the GDK; do not delete them. SpatialOS needs them for launching a deployment. You save these into your initial snapshot when you generate it.

The critical entities are:

  • SpatialSpawner - an entity with the PlayerSpawner component which contains the spawn_player command. Client-worker instances connecting to a deployment use this entity to spawn their player.
  • GlobalStateManager - an entity with the GlobalStateManager component which has a map of singleton classes to entity IDs (see Global State manager glossary entry). The GDK uses this entity to orchestrate the replication of Singleton Actors.

Placeholder entities

Placeholder entities are listed in snapshots by default. You can opt to exclude them when generating a snapshot via the SpatialOS GDK toolbar.

These entities exist only to set up server-worker boundaries in a way that is easy to test with multiple server-workers. These entities do not spawn as Actors when checked out by a worker and serve no purpose within the GDK. In most cases you can safely ignore them.

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