Tooltip in world space works, need to populate with data

src/debug.rs

@@ -36,7 +36,9 @@ impl Plugin for DebuggingPlugin {
                     )
                         .run_if(in_state(DebuggingState::On)),
                 ),
-            );
+            )
+            .add_observer(add_tooltip_text)
+            .add_observer(remove_tooltip_text);
 
         // WebGL2-incompatible systems
         #[cfg(not(target_arch = "wasm32"))]
@@ -265,6 +267,37 @@ fn lock_tooltip(
     });
 }
 
+/// when a tooltip is added to an entity, insert the text component
+fn add_tooltip_text(
+    trigger: Trigger<OnAdd, ToolTip>,
+    mut commands: Commands,
+) {
+    info!("Adding text2d to {:?}", trigger.target());
+    commands.entity(trigger.target()).with_children(|parent| {
+        parent.spawn((
+            TextColor(GREEN.into()),
+            Text2d("Placeholder".into()),
+            Transform::from_xyz(1.5, 0.0, 1.0).with_scale(Vec3::splat(0.01)),
+        ));
+    });
+}
+
+/// when a tooltip is removed to an entity, remove the text components
+fn remove_tooltip_text(
+    trigger: Trigger<OnRemove, ToolTip>,
+    mut commands: Commands,
+    parents: Query<&Children>,
+    text_2d: Query<Entity, With<Text2d>>,
+) {
+    // Get lis of children for this entity
+    let children = parents.get(trigger.target()).unwrap();
+    // Find the tooltip text child
+    if let Some(child) = children.iter().find_map(|child| text_2d.get(child).ok()) {
+        // Remove it from the world
+        commands.entity(child).despawn();
+    }
+}
+
 /// When you hover over a mesh, update the tooltip with some info
 fn hover_mesh(
     mut over_events: EventReader<Pointer<Over>>,