made proto_locomotion used a config resource

src/xr_input/trackers.rs

@@ -1,4 +1,4 @@
-use bevy::prelude::Component;
+use bevy::prelude::{info, Added, BuildChildren, Commands, Component, Entity, Query, With};
 
 #[derive(Component)]
 pub struct OpenXRTrackingRoot;
@@ -16,3 +16,21 @@ pub struct OpenXRLeftController;
 pub struct OpenXRRightController;
 #[derive(Component)]
 pub struct OpenXRController;
+
+pub fn adopt_open_xr_trackers(
+    query: Query<(Entity), Added<OpenXRTracker>>,
+    mut commands: Commands,
+    tracking_root_query: Query<(Entity, With<OpenXRTrackingRoot>)>,
+) {
+    let root = tracking_root_query.get_single();
+    match root {
+        Ok(thing) => {
+            // info!("root is");
+            for tracker in query.iter() {
+                info!("we got a new tracker");
+                commands.entity(thing.0).add_child(tracker);
+            }
+        }
+        Err(_) => info!("root isnt spawned yet?"),
+    }
+}