What wrong with my code when i create an entity at runtime?

Code (CSharp):

1. using Unity.Entities;
2. using Unity.Mathematics;
3. using Unity.Rendering;
4. using Unity.Transforms;
5. using UnityEngine;
6.  
7. public class CubeSpawner : JobComponentSystem
8. {
9.     private static EntityManager entityManager;
10.     private static EntityArchetype cubeArchetype;
11.     public static MeshInstanceRenderer cubeRenderer;
12.     public static Entity entity;
13.  
14.     [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
15.     public static void Initialize()
16.     {
17.         entityManager = World.Active.GetOrCreateManager<EntityManager>();
18.         cubeArchetype = entityManager.CreateArchetype
19.             (
20.             typeof(Position),
21.             typeof(MeshInstanceRenderer),
22.             typeof(LocalToWorld)
23.             );
24.         Spawn();
25.     }
26.  
27.     protected override void OnCreateManager()
28.     {
29.         base.OnCreateManager();
30.         Spawn();
31.     }
32.     private static void Spawn()
33.     {
34.         // Prepare cube entity prefab .
35.         GameObject cube = Resources.Load("cube") as GameObject;
36.         // I can done this way.
37.         Entity entity1 = entityManager.Instantiate(cube);
38.  
39.         // Entity doesn't show up in scene. Why?
40.         Entity entity2 = entityManager.CreateEntity(cubeArchetype);
41.         entityManager.SetComponentData(entity2, new Position { Value = new float3(6, 0, 0) });
42.         entityManager.SetSharedComponentData(entity2, new MeshInstanceRenderer { mesh = cube.GetComponent<MeshInstanceRendererComponent>().Value.mesh });
43.         Debug.Log("Done.");
44.     }
45.  
46. }
47.  

 

is Debug.Log("Done."); printing out?
I assume you have 0 errors.

Is cube material set to GPU instancing?

 

Your MIR is missing a material?

 

When i change this class inherit from Monobehaviour it work. But Why? Why not Job or System?

Code (CSharp):

1. using Unity.Entities;
2. using Unity.Mathematics;
3. using Unity.Rendering;
4. using Unity.Transforms;
5. using UnityEngine;
6.  
7. public class CubeSpawner : MonoBehaviour
8. {
9.     private EntityManager entityManager;
10.     private EntityArchetype cubeArchetype;
11.     public Entity entity;
12.  
13.     private void Start()
14.     {
15.         entityManager = World.Active.GetOrCreateManager<EntityManager>();
16.         cubeArchetype = entityManager.CreateArchetype
17.             (
18.             typeof(Position),
19.             typeof(MeshInstanceRenderer)
20.             );
21.         Spawn();
22.     }
23.  
24.     private void Spawn()
25.     {
26.         // Prepare cube entity prefab .
27.         GameObject cube = Resources.Load("cube") as GameObject;
28.  
29.         Entity entity2 = entityManager.CreateEntity(cubeArchetype);
30.         entityManager.SetComponentData(entity2, new Position { Value = new float3(6, 0, 0) });
31.         entityManager.SetSharedComponentData(entity2, cube.GetComponent<MeshInstanceRendererComponent>().Value );
32.         Debug.Log("Done.");
33.     }
34.  
35. }
36.  

 

I'm not certain Initialize runs before OnCreateManager

Have you tested that?