diff --git a/Cargo.toml b/Cargo.toml
index 48ee500..52731ec 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ readme = "README.md"
 authors = ["laund <me@laund.moe>"]
 
 [dependencies]
-bevy = { version = "0.16", default-features = false }
+bevy = { version = "0.19", default-features = false }
 # KD-Tree dependencies
 kd-tree = { version = "0.6.0", optional = true }
 typenum = { version = "1.18.0" }
@@ -23,7 +23,7 @@ kdtree_rayon = ["kdtree", "kd-tree/rayon"]
 kdtree = ["dep:kd-tree"]
 
 [dev-dependencies]
-bevy = { version = "0.16" }
+bevy = { version = "0.19" }
 rand = "0.8"
 
 [profile.dev]
diff --git a/examples/distance3d.rs b/examples/distance3d.rs
index 9affa47..88a74b6 100644
--- a/examples/distance3d.rs
+++ b/examples/distance3d.rs
@@ -41,7 +41,6 @@ fn setup(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
     mut materials: ResMut<Assets<StandardMaterial>>,
-    mut ambient_light: ResMut<AmbientLight>,
 ) {
     let handles = MaterialHandles {
         orange_red: materials.add(Color::from(csscolors::ORANGE_RED)),
@@ -50,8 +49,11 @@ fn setup(
     };
     commands.insert_resource(handles.clone());
 
-    ambient_light.color = Color::WHITE;
-    ambient_light.brightness = 500.;
+    commands.insert_resource(GlobalAmbientLight {
+        color: Color::WHITE,
+        brightness: 500.,
+        ..default()
+    });
 
     commands.spawn((
         Camera3d::default(),
diff --git a/examples/modify_timestep.rs b/examples/modify_timestep.rs
index 37be19f..663a3eb 100644
--- a/examples/modify_timestep.rs
+++ b/examples/modify_timestep.rs
@@ -34,7 +34,7 @@ fn setup(mut commands: Commands) {
     commands.spawn((
         Text("Click mouse to change rate".to_string()),
         TextFont {
-            font_size: 30.0,
+            font_size: FontSize::Px(30.0),
             ..default()
         },
         TextColor(Color::BLACK),
diff --git a/examples/within2d.rs b/examples/within2d.rs
new file mode 100644
index 0000000..80ce8a2
--- /dev/null
+++ b/examples/within2d.rs
@@ -0,0 +1,171 @@
+use std::ops::Deref;
+use std::time::Duration;
+
+use bevy::{
+    color::palettes::css as csscolors,
+    diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
+    math::Vec3Swizzles,
+    prelude::*,
+    window::PrimaryWindow,
+};
+use bevy_spatial::{AutomaticUpdate, SpatialAABBAccess, SpatialStructure};
+use bevy_spatial::{SpatialAccess, kdtree::KDTree2};
+// marker for entities tracked by the KDTree
+#[derive(Component, Default)]
+struct NearestNeighbourComponent;
+
+// marker for the "cursor" entity
+#[derive(Component)]
+struct Cursor;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins.set(WindowPlugin {
+            primary_window: Some(Window {
+                present_mode: bevy::window::PresentMode::AutoNoVsync,
+                ..default()
+            }),
+            ..default()
+        }))
+        // Add the plugin, which takes the tracked component as a generic.
+        .add_plugins(
+            AutomaticUpdate::<NearestNeighbourComponent>::new()
+                .with_spatial_ds(SpatialStructure::KDTree2)
+                .with_frequency(Duration::from_millis(1)),
+        )
+        .add_plugins(LogDiagnosticsPlugin::default())
+        .add_plugins(FrameTimeDiagnosticsPlugin::default())
+        .insert_resource(Mouse2D { pos: Vec2::ZERO })
+        .add_systems(Startup, setup)
+        .add_systems(
+            Update,
+            (
+                update_mouse_pos,
+                (
+                    mouse,
+                    color_rect,
+                    reset_color.before(color_rect),
+                    collide_wall,
+                    movement,
+                ),
+            )
+                .chain(),
+        )
+        .run();
+}
+
+// type alias for easier usage later
+type NNTree = KDTree2<NearestNeighbourComponent>;
+
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2d);
+    commands.spawn((
+        Cursor,
+        Sprite {
+            color: Color::srgb(0.0, 0.0, 1.0),
+            custom_size: Some(Vec2::new(10.0, 10.0)),
+            ..default()
+        },
+        Transform {
+            translation: Vec3::ZERO,
+            ..default()
+        },
+    ));
+    let sprite = Sprite {
+        color: csscolors::ORANGE_RED.into(),
+        custom_size: Some(Vec2::new(6.0, 6.0)),
+        ..default()
+    };
+    for x in -100..100 {
+        for y in -100..100 {
+            commands.spawn((
+                NearestNeighbourComponent,
+                sprite.clone(),
+                Transform {
+                    translation: Vec3::new((x * 4) as f32, (y * 4) as f32, 0.0),
+                    ..default()
+                },
+            ));
+        }
+    }
+}
+#[derive(Copy, Clone, Resource)]
+struct Mouse2D {
+    pos: Vec2,
+}
+
+fn update_mouse_pos(
+    window: Single<&Window, With<PrimaryWindow>>,
+    camera: Single<(&Camera, &GlobalTransform)>,
+    mut mouse: ResMut<Mouse2D>,
+) {
+    let (cam, cam_t) = camera.deref();
+    if let Some(w_pos) = window.cursor_position() {
+        if let Ok(pos) = cam.viewport_to_world_2d(cam_t, w_pos) {
+            mouse.pos = pos;
+        }
+    }
+}
+
+fn mouse(
+    mut commands: Commands,
+    mouse: Res<Mouse2D>,
+    treeaccess: Res<NNTree>,
+    ms_buttons: Res<ButtonInput<MouseButton>>,
+    mut query: Query<&mut Sprite, With<NearestNeighbourComponent>>,
+) {
+    let use_mouse = ms_buttons.pressed(MouseButton::Left);
+
+    let p1 = mouse.pos;
+    let p2 = Vec2::from([100.0, -100.0]);
+
+    for (_, entity) in treeaccess.within(p1, p2) {
+        if use_mouse {
+            commands.entity(entity.unwrap()).despawn();
+        }
+
+    }
+}
+
+fn color_rect(
+    treeaccess: Res<NNTree>,
+    mouse: Res<Mouse2D>,
+    mut query: Query<&mut Sprite, With<NearestNeighbourComponent>>,
+) {
+    let p1 = mouse.pos;
+    let p2 = Vec2::from([100.0, -100.0]);
+
+    for (_, entity) in treeaccess.within(p1, p2) {
+        if let Ok(mut sprite) = query.get_mut(entity.unwrap()) {
+            sprite.color = csscolors::GREEN.into();
+        }
+    }
+}
+
+fn reset_color(mut query: Query<&mut Sprite, With<NearestNeighbourComponent>>) {
+    for mut sprite in &mut query {
+        sprite.color = csscolors::ORANGE_RED.into();
+    }
+}
+
+fn movement(mut query: Query<&mut Transform, With<NearestNeighbourComponent>>) {
+    for mut pos in &mut query {
+        let goal = pos.translation - Vec3::ZERO;
+        pos.translation += goal.normalize_or_zero();
+    }
+}
+
+fn collide_wall(
+    window: Single<&Window, With<PrimaryWindow>>,
+    mut query: Query<&mut Transform, With<NearestNeighbourComponent>>,
+) {
+    let w = window.width() / 2.0;
+    let h = window.height() / 2.0;
+
+    for mut pos in &mut query {
+        let [x, y] = pos.translation.xy().to_array();
+        if y < -h || x < -w || y > h || x > w {
+            pos.translation = pos.translation.normalize_or_zero();
+        }
+    }
+}
diff --git a/src/automatic_systems.rs b/src/automatic_systems.rs
index af44b82..2426780 100644
--- a/src/automatic_systems.rs
+++ b/src/automatic_systems.rs
@@ -7,7 +7,10 @@ use crate::{
 };
 
 use bevy::{
-    ecs::schedule::{ScheduleLabel, SystemSet},
+    ecs::{
+        component::Mutable,
+        schedule::{ScheduleLabel, SystemSet},
+    },
     prelude::*,
 };
 
@@ -29,7 +32,7 @@ pub(crate) struct AutoT<SpatialDS>(PhantomData<SpatialDS>);
 impl<SpatialDS> AutoT<SpatialDS>
 where
     GlamVec<SpatialDS>: VecFromTransform,
-    SpatialDS: UpdateSpatialAccess + Resource,
+    SpatialDS: UpdateSpatialAccess + Resource<Mutability = Mutable>,
     <SpatialDS as SpatialAccess>::Point: From<(Entity, GlamVec<SpatialDS>)>,
     SpatialDS::Comp: Component,
 {
@@ -61,7 +64,7 @@ pub(crate) struct AutoGT<SpatialDS>(PhantomData<SpatialDS>);
 impl<SpatialDS> AutoGT<SpatialDS>
 where
     GlamVec<SpatialDS>: VecFromGlobalTransform,
-    SpatialDS: UpdateSpatialAccess + Resource,
+    SpatialDS: UpdateSpatialAccess + Resource<Mutability = Mutable>,
     <SpatialDS as SpatialAccess>::Point: From<(Entity, GlamVec<SpatialDS>)>,
     SpatialDS::Comp: Component,
 {
diff --git a/src/kdtree.rs b/src/kdtree.rs
index bfdadf9..00be227 100644
--- a/src/kdtree.rs
+++ b/src/kdtree.rs
@@ -6,7 +6,7 @@ use kd_tree::{KdPoint, KdTree as BaseKdTree, KdTreeN};
 use crate::{
     TComp,
     point::SpatialPoint,
-    spatial_access::{SpatialAccess, UpdateSpatialAccess},
+    spatial_access::{SpatialAABBAccess, SpatialAccess, UpdateSpatialAccess},
 };
 
 use std::marker::PhantomData;
@@ -47,6 +47,35 @@ macro_rules! kdtree_impl {
             }
         }
 
+        impl<Comp> SpatialAABBAccess for $treename<Comp>
+        where
+            Comp: TComp,
+        {
+            /// Return all points which are within the specified rectangular axis-aligned region.
+            fn within(
+                &self,
+                loc1: <Self::Point as SpatialPoint>::Vec,
+                loc2: <Self::Point as SpatialPoint>::Vec,
+            ) -> Vec<Self::ResultT> {
+                let _span = info_span!("within").entered();
+
+                let p1: $pt = loc1.min(loc2).into();
+                let p2: $pt = loc1.max(loc2).into();
+
+                let rect = [p1, p2];
+
+                if self.tree.len() == 0 {
+                    vec![]
+                } else {
+                    self.tree
+                        .within(&rect)
+                        .iter()
+                        .map(|e| (e.vec(), e.entity()))
+                        .collect()
+                }
+            }
+        }
+
         impl<Comp> SpatialAccess for $treename<Comp>
         where
             Comp: TComp,
diff --git a/src/lib.rs b/src/lib.rs
index 76bf591..5346884 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -35,7 +35,7 @@
 
 pub mod point;
 mod spatial_access;
-pub use self::spatial_access::SpatialAccess;
+pub use self::spatial_access::{SpatialAccess, SpatialAABBAccess};
 
 use bevy::prelude::Component;
 mod timestep;
diff --git a/src/spatial_access.rs b/src/spatial_access.rs
index 435a8f1..2ca52e1 100644
--- a/src/spatial_access.rs
+++ b/src/spatial_access.rs
@@ -63,4 +63,11 @@ pub trait SpatialAccess: Send + Sync + 'static {
     ) -> Vec<Self::ResultT>;
 }
 
-// TODO: SpatialAABBAccess trait definition - should it be separate from SpatialAccess or depend on it?
+pub trait SpatialAABBAccess: SpatialAccess {
+    /// Return all points which are within the specified rectangular axis-aligned region.
+    fn within(
+        &self,
+        loc1: <Self::Point as SpatialPoint>::Vec,
+        loc2: <Self::Point as SpatialPoint>::Vec,
+    ) -> Vec<Self::ResultT>;
+}