Help with CopyFromComponentDataArray

I am instantiating my prefabs with this:

Code (CSharp):

1. entityManager.Instantiate(prefab, entityNativeArray);

I have a job that returns a LocalToWorld array (NativeArray<float4x4>) that is the same length as the instantiated array.

How do I copy the LocalToWorld data to my entities without looping through them?

I have seen this in a SystemBase class, but how do I pass the NativeArray<float4x4> data from my job to the SystemBase class?

Code (CSharp):

1. EntityQuery updatePos = GetEntityQuery(
2.      typeof(LocalToWorld)
3. );
4.        
5. updatePos.CopyFromComponentDataArray(localToWorld);

Is there a way to do this without using the EntityQuery?

 

Code (CSharp):

1. Job.WithCode(() =>
2. {
3.     for (int i = 0; i < entityNativeArray.Length; i++)
4.         SetComponent(entityNativeArray[i], new LocalToWorld { Value = ltwArray[i] });
5. }.Schedule();

 

My NativeArrays are currently variables in a Monobehaviour class. How do I get my NativeArrays into a systemBase class?

I can't instantiate a SystemBase. I guess this is more of a how do I pass data around question. Do I just make an IComponentData entity and save it there? (over 100,000 elements in my arrays).

Edit with a little more detail

My main class is a MonoBehaviour class.

1. Load and parse a large JSON file.
2. Instantiate a new class "Calculate" in order to run my IParallelFor jobs to convert the JSON data into LocalToWorld data. This is passed back to my MonoBehaviour class.
3. Instantiate a new class to create the prefab and instantiate my entities. this class passes the entityNativeArray back to my MonoBehaviour class
4. Now I need to add the LocalToWorld data to the entities. My current solution is to just loop through them and combine the two in a job. It works, but it would be nice to do this in one step using CopyFromComponentDataArray.

 

Someone with more experience interopping MonoBehaviour and Entities will have to help you, because I really don't understand your architecture and consequently don't feel comfortable suggesting an API pathway. I only use MonoBehaviours for authoring or as hybrid components, but all logic is driven by systems.

 

You can use:

Code (CSharp):

1. var system = World.DefaultGameObjectInjectionWorld.GetOrCreateSystem<SystemYouWant>();
2.             system.SystemNativeArray = YourNativeArray;

In the example, it's a field in the system, but it surely can be a method with a parameter. It's not a very clean solution but you can definitely try it this way or just use ECB inside a job to iterate and fill values.

 

@Krajca - thank you

That's what I was looking for