Entity hierarchy when only using the bevy_ecs crate?

[eboatwright]

I want to use the Bevy ECS with the Macroquad rendering. So, I've got most of it done, I just wanted to know if there was already an entity hierarchy system inside the bevy_ecs crate. I couldn't find anything, so I was making sure that there wasn't a way to do it before I jump into trying to do it myself.

[alice-i-cecile]

What you really want is relations: #3742. As that is not yet implemented (and won't be for a while), I would suggest writing your own tool. The discussion in that linked issue is helpful, if somewhat overwhelming, and you can look at how bevy_transform does it as well.