wave5-parent-child-hierarchy-dynamic

To safely reparent entities in Unity DOTS, use an Entity Command Buffer to update Parent components during structural changes, ensuring children have LocalTransform components so hierarchy world-space results aren't skipped.

Runtime hierarchy changes corrupt DynamicBuffer<Child> iteration because direct structural changes invalidate the buffer while it is being read, requiring ECB-based deferred structural changes to modify parents safely.

Implement weapon pickup and vehicle mounting by iterating the parent's DynamicBuffer<Child> and issuing attach or detach structural changes through an ECB, ensuring each attached child has a LocalTransform component.

The best way to handle batch hierarchy changes for multiple children is using safe iteration patterns with an Entity Command Buffer to detach or adjust many children efficiently without invalidating the DynamicBuffer<Child>.

Yes, you need LocalTransform on every attached child for Unity DOTS hierarchy reparenting, because missing this component causes hierarchy world-space transform propagation results to be silently skipped.

You should not modify Child buffers directly during entity reparenting when iterating, because consistent ownership requires Child buffers to be modified only by the owning system using deferred ECB structural changes.