Add a way to refer back to a common deep ancestor 🦑 #5534
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This allows querying for a potentially far-off ancestor in the bevy hierarchy with the `Ancestor` component. It's a very simple system that recursively traverse the children of an entity marked with a `MarkDescendants` component, and adds a `Ancestor` component to entities that comply to a rule provided in the `MarkDescendants` component. drawbacks: - It is not "smart", it's just a one-off event that generates the components once. No dynamically updating the `Ancestor` component to account for runtime changes to the hierarchy. - It requires an exclusive system. An alternative design could be providing a generic system and letting the user add the system with their prefered query filter. - Users need to add the `mark_descendants` system themselves.
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Objective
This allows querying for a potentially far-off ancestor in the bevy
hierarchy with the
Ancestorcomponent.Motivation
I found myself needing such components a lot in #5378,
I think it might also have a few other applications.
Solution
It's a very simple system that recursively traverse the children of an
entity marked with a
MarkDescendantscomponent, and adds aAncestorcomponent to entities that comply to a rule provided in the
MarkDescendantscomponent.drawbacks:
components once. No dynamically updating the
Ancestorcomponentto account for runtime changes to the hierarchy.
providing a generic system and letting the user add the system with
their prefered query filter.
mark_descendantssystem themselves.Changelog
MarkDescendantsandAncestorcomponents to make deep hierarchical relations easier to handle