Question When I get his index after instantiate entity, I always get -1

I instantiate enity in job, I get the index of entity is -1. Shouldn't index be different?

Code (CSharp):

1. [BurstCompile]
2. private void Execute([ChunkIndexInQuery] int chunkIndex)
3. {
4.     Entity entity = ecb.Instantiate(chunkIndex, prefab);
5.     int index = entity.Index;
6.     UnityEngine.Debug.Log(">>>>>>>>>> " + index);
7. }

>>>>>>>>>> -1

 

The actual entity creation happens during ECB playback. While recording, each ECB creates 'fake' entities only usable within the context of the ECB. If you execute another

Instantiate

on the same ECB it would get index -2.
The entity returned is not usable for anything except for queing additional commands on the same ECB.

 

Oh, I see. Thank you very much