Method OnUpdate

OnUpdate()

Implement OnUpdate() to perform the major work of this system.

Declaration

[RequiredMember]
protected abstract void OnUpdate()

Remarks

By default, the system invokes OnUpdate() once every frame on the main thread. To skip OnUpdate if all of the system's EntityQueries are empty, use the RequireMatchingQueriesForUpdateAttribute. To limit when OnUpdate is invoked, you can specify components that must exist, or queries that match specific Entities. To do this, call RequireForUpdate<T>() or RequireForUpdate(EntityQuery) in the system's OnCreate method. For more information, see ShouldRunSystem.

The Entities.ForEach and Job.WithCode constructions provide convenient mechanisms for defining jobs. You can also instantiate and schedule an IJobChunk instance; you can use the C# Job System or you can perform work on the main thread. If you call EntityManager methods that perform structural changes on the main thread, be sure to arrange the system order to minimize the performance impact of the resulting sync points.