Question Need help with Accessing Child Entities during subscene baking

Hi.
I have gameobjects in a subscene that are using multiple materials.
When the gameobjects are converted, for each material they are split into child entities parented to a parent entity. I'd like to add material overrides components to the child entities.

I use a baker where I tag that entity, then using a baking system I can query the parent entity, but i can't access the child entities using SystemAPI.HasBuffer<Child>(entity).

Code (CSharp):

1. public class BuildingFloorAuthoring : MonoBehaviour
2.     {
3.         public int Floor = 0;
4.  
5.         private class BuildingFloorAuthoringBaker : Baker<BuildingFloorAuthoring>
6.         {
7.             public override void Bake(BuildingFloorAuthoring authoring)
8.             {
9.                 var entity = GetEntity(TransformUsageFlags.Dynamic);
10.  
11.                 AddComponent(entity, new Floor()
12.                 {
13.                     Value = authoring.Floor
14.                 });
15.  
16.             }
17.         }
18.     }
19.  
20.     public struct Floor : IComponentData
21.     {
22.         public int Value;
23.     }
24.  
25.     [WorldSystemFilter(WorldSystemFilterFlags.BakingSystem)]
26.     partial struct AddMaterialOverrideToSubMeshesBakingSystem : ISystem
27.     {
28.         public void OnUpdate(ref SystemState state)
29.         {
30.             var queryFloorTag = SystemAPI.QueryBuilder()
31.                 .WithAny<Floor>()
32.                 .Build();
33.            
34.             var entityArray = queryFloorTag.ToEntityArray(Allocator.Temp);
35.  
36.             foreach (var entity in entityArray)
37.             {
38.                 Debug.Log("iteration");
39.                 if (SystemAPI.HasBuffer<Child>(entity))
40.                 {
41.                     Debug.Log("found child");
42.                 }
43.             }
44.  
45.             entityArray.Dispose();
46.         }
47.     }

The debug "iteration" runs fine and matches the number of tagged entities, but "found child" never prints.
If I run the system outside of the baking then it works fine.
What am I doing wrong? Thanks.

 

Baked entities don't have a Child buffer. That's added at runtime.

 

I see, I'll add the material overrides at runtime then. Thank you for taking the time to help!