Systems are not updating automatically

What do I have to do to get update to be called on systems? It is only called if I manually call it.

Code (CSharp):

1. public sealed class TestComponentSystem : ComponentSystem {
2.         protected override void OnStartRunning() {
3.             base.OnStartRunning();
4.             Debug.Log("OnStartRunning");
5.         }
6.  
7.         protected override void OnStopRunning() {
8.             base.OnStopRunning();
9.             Debug.Log("OnStopRunning");
10.         }
11.  
12.         protected override void OnCreateManager() {
13.             base.OnCreateManager();
14.             Debug.Log("OnCreateManager");
15.         }
16.  
17.         protected override void OnDestroyManager() {
18.             base.OnDestroyManager();
19.             Debug.Log("OnDestroyManager");
20.         }
21.  
22.         protected override void OnUpdate() {
23.             Debug.Log("OnUpdate");
24.         }
25.     }

Only OnCreateManager() is called. If I call Update(), it calls OnStartRunning() and OnUpdate(), but I thought Update() was supposed to be called automatically.

 

It called automatically if system registred in default world bootstrap ScriptBehaviourUpdateOrder. All depend on how you create this system.

 

If the system has no matched entities, OnUpdate() is not called when the system uses ComonentGroup. Use [AlwaysUpdateSystem] attribute.

 

How can I make sure it is registered? I am not manually creating the system.

I added the attribute and it is still not being called.

I added another system and several entities with matched components and it has the same issue. It works when I manually call update, but is not called automatically.

Code (CSharp):

1. public sealed class ApplyVelocityToPositionUnitySystem : JobComponentSystem {
2.         [BurstCompile]
3.         struct Job : IJobProcessComponentData<Position, Velocity2DComponentData> {
4.             public float deltaTime;
5.          
6.             public void Execute(ref Position position, [ReadOnly] ref Velocity2DComponentData velocity) {
7.                 var addition = velocity.value * deltaTime;
8.                 position.Value.x += addition.x;
9.                 position.Value.y += addition.y;
10.             }
11.         }
12.  
13.         protected override JobHandle OnUpdate(JobHandle inputDeps) {
14.             var job = new Job() { deltaTime = Time.fixedDeltaTime };
15.             return job.Schedule(this, inputDeps);
16.         }
17.     }

 

Your code works fine for me. Has to be something else going on in your project.

 

I was able to fix it by manually calling

ScriptBehaviourUpdateOrder.UpdatePlayerLoop(world);

Is it normal to have to do that? Maybe something in my project is interfering with ECS. It is a big project.

 

You only need to call UpdatePlayerLoop if you're manually adding/removing systems. But it's certainly required if you are.

 

I am not, but it's good to know because I would prefer to add the systems manually. I will use Zenject dependency injection for creating them.

 

Are you using UniRx.Async? That library modifies the player loop in order to make `await` returns to the same spot in the next update etc. It execute after ECS's modification, so all ECS systems are erased from the player loop.

https://notargs.hateblo.jp/entry/ecs_unirx

 

Only if you manually operate with system lifetime. You use UNITY_DISABLE_AUTOMATIC_SYSTEM_BOOTSTRAP in Scripting Define Symbols? Or UniRx as @5argon says?

 

Yes, that was the issue. Thanks for the link too.