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Votes

0

Found in [Package]

0.0.12-preview.33

Issue ID

1163747

Regression

No

Destroying all entities in a world does not set next empty entity to index 0

Package: Entity Component System (ECS)

-

How to reproduce:
1. Open attached project "DestroyAllEntities (2).zip"
2. In Package Manager, install Entities package
3. Enter Play mode and observe Console window

Expected result: "Unexpected first entity index for empty world, Entity = 0:2", the new entity's index is 0
Actual result: "Unexpected first entity index for empty world, Entity = 994:2" the new entity's index is 994

Reproducible with: 2019.1.0b7 (preview.30), 2019.1.9f1 (preview.33), 2019.2.0b7 (preview.33),
Could not test with: 2017.4, 2018.4.3f1 (preview.24), 2019.1.0b6 (preview.30) due to package errors
2019.3.0a1 (preview.33), 2019.3.0a7 (preview.33) due to Burst package errors

  1. Resolution Note:

    NAB. There aren't any guarantees about what entity id will be, other than they will be unique identifiers.

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Comments (1)

  1. DerekKelly

    Jul 05, 2019 19:09

    That would be fair enough.
    But calling MoveEntitiesFrom on an EntityManager will return the next entity id to 0.
    So will calling DestroyEntity on all the Entities in the world in reverse order.
    As will this
    NativeArray<Entity> entityArray = testWorld.EntityManager.GetAllEntities();
    List<Entity> entityList = new List<Entity>(entityArray.Reverse());
    entityArray.CopyFrom(entityList.ToArray());
    testWorld.EntityManager.DestroyEntity(entityArray);

    It would be nice to get this behaviour without jumping through hoops. A Reset method perhaps.

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