Transform Child buffer does not appear on the root entity

Unity Engine
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1

I have a prefab, which is an empty object, that groups several visual objects under itself. When I spawn it, it has no Child buffer but does have LinkedEntityGroup (even though its children have this root entity as a Parent). If I modify the conversion system to add and fill the Child buffer, it appears on prefab but is missing on the instance whenever I instantiate the prefab. Is there a way to make the prefab creating or, at least, preserving its children?

2

I use the following code in my conversion system, but it seems like the Child buffer appears on the next frame and not at the moment of the prefab’s instantiation. I wonder why.

            var dbfChild = dstManager.AddBuffer<Child>(entity);
            foreach (Transform t in transform)
            {
                var eChild = conversionSystem.GetPrimaryEntity(t);
                dbfChild.Add(new Child() { Value = eChild });
            }
3

The Child buffer is a system state type that is added by the transform system. System state types aren’t replicated when instantiating entities.

4

Ouch! I didn’t know that! Thank you!

5

Well, this still doesn’t help to get the buffer. It just doesn’t appear automagically on the root entity. Is there any way to make an entity hook it’s direct children?

6

Update the TransformSystemGroup.

1 Like
7

Awesome thanks! EndFrameParentSystem from TransformSystemGroup did the trick