How to query for 2 different entity archetypes in one system?

i have a JobComponentSystem and use IJobProcessComponentDataWithEntity<Collider> to query for mouse click target Entities.
Then I need to iterate over another entity archetype with a Spring component
How can I do that?

I can not use GetComponentDataFromEntity, because these are completely different entities.

 

Use IJobChunk instead.
https://docs.unity3d.com/Packages/com.unity.entities@0.0/manual/chunk_iteration_job.html

 

I read the docs and visited an example, but there is a single entity archetype used.
IJobChunk.Schedule accepts the only ComponentGroup as a first parameter.

 

There is an example. You use two archetype queries and combine them:

Code (CSharp):

1. protected override void OnCreateManager()
2. {
3.    var query0 = new EntityArchetypeQuery
4.    {
5.        All = new ComponentType[] {typeof(RotationQuaternion)}
6.    };
7.  
8.    var query1 = new EntityArchetypeQuery
9.    {
10.        All = new ComponentType[] {typeof(RotationSpeed)}
11.    };
12.  
13.    m_Group = GetComponentGroup(new EntityArchetypeQuery[] {query0, query1});
14. }

 

Now I have a problem - the systems run for the first time (I can enter OnCreateManager in the debugger), but I don't seen any presense of the system when a program running. Entity debugger shows other systems, but not the system with the IJobChunk.

My code:

Code (CSharp):

1. using Unity.Collections;
2. using Unity.Entities;
3. using Unity.Jobs;
4. using UnityEngine;
5.  
6. namespace Ecs
7. {
8.     public class ClickHandleSystem : JobComponentSystem
9.     {
10.         struct ColliderGroupJob : IJobChunk
11.         {
12.             [ReadOnly]
13.             public ArchetypeChunkComponentType<Collider> Colliders;
14.             [ReadOnly]
15.             public ArchetypeChunkComponentType<Node> Nodes;
16.             [ReadOnly]
17.             public ArchetypeChunkComponentType<Spring> Springs;
18.             public ArchetypeChunkComponentType<DirectedConnection> Connections;
19.  
20.  
21.             public void Execute(ArchetypeChunk chunk, int chunkIndex, int firstEntityIndex)
22.             {
23.                 var chunkColliders = chunk.GetNativeArray(Colliders);
24.                 var chunkSprings = chunk.GetNativeArray(Springs);
25.                 for (int i = 0; i < chunk.Count; i++)
26.                 {
27.                     Debug.Log(chunkColliders[i].Radius);
28.                     Debug.Log(chunkSprings[i].Stiffness);
29.                 }
30.             }
31.         }
32.  
33.         ComponentGroup group;
34.  
35.         protected override void OnCreateManager()
36.         {
37.             var nodes = new EntityArchetypeQuery { All = new ComponentType[] { typeof(Collider), typeof(Node) } };
38.             var springs = new EntityArchetypeQuery { All = new ComponentType[] { typeof(Spring), typeof(DirectedConnection) } };
39.             group = GetComponentGroup(new EntityArchetypeQuery[] { nodes, springs });
40.         }
41.         protected override JobHandle OnUpdate(JobHandle inputDeps)
42.         {
43.             var colliders = GetArchetypeChunkComponentType<Collider>(true);
44.             var nodes = GetArchetypeChunkComponentType<Node>(true);
45.             var spring = GetArchetypeChunkComponentType<Spring>(true);
46.             var connections = GetArchetypeChunkComponentType<DirectedConnection>(false);
47.             return new ColliderGroupJob {
48.                 Colliders = colliders,
49.                 Connections = connections,
50.                 Nodes = nodes,
51.                 Springs = spring
52.             }.Schedule(group, inputDeps);
53.         }
54.     }
55. }

Am I missing something?

 

I do not know why it is not showing but I think you have an error in the job. You are aware that some of your chunks may not contain both components? You should check if this chunk contains them.

 

Thank you. There was type mismatch in my code, so system failed to execute.

The last (I hope) question: what is the difference between chunk.Has() and chunk.HasChunkComponent()?
Both methods receive the same arguments and return bool. But Has() works while HasChunkComponent() is not.

 

Has check existance type in archetype in which chunk presented. HasChunkComponent check existance of component on chunk (now we have components associated not only with entity but with chunk too)

 

How can I know that I finished processing all entitiy archetypes when using IJobChunk?
I don't see any advantage over two separate systems in my case.