diff --git a/Cargo.lock b/Cargo.lock
index 0c3af44..4e240cd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -457,6 +457,15 @@ dependencies = [
  "glam 0.13.1",
 ]
 
+[[package]]
+name = "bevy_mod_raycast"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b699d78034aaf5730a4c10a09fd5a2e6886964a42fa7453b9e5f8b926cd846e"
+dependencies = [
+ "bevy",
+]
+
 [[package]]
 name = "bevy_pbr"
 version = "0.5.0"
@@ -2124,6 +2133,7 @@ name = "moria"
 version = "0.1.0"
 dependencies = [
  "bevy",
+ "bevy_mod_raycast",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 2f436f8..bc8dd57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2018"
 
 [dependencies]
 bevy = "0.5.0"
+bevy_mod_raycast = "0.2.2"
diff --git a/src/camera.rs b/src/camera.rs
index 91dc6be..df0e633 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -1,8 +1,18 @@
 use bevy::prelude::*;
+use bevy_mod_raycast::{RayCastMethod, RayCastSource};
 
 use crate::player::*;
 
+pub struct MyRaycastSet;
+
 pub struct Camera;
+pub fn spawn_camera(commands: &mut Commands) {
+    commands
+        .spawn_bundle(PerspectiveCameraBundle::default())
+        .insert(Camera)
+        .insert(RayCastSource::<MyRaycastSet>::new());
+}
+
 pub fn camera_follow_player(
     player: Query<(&Transform, &Player), Without<Camera>>,
     mut camera: Query<(&mut Transform, &Camera), Without<Player>>,
@@ -18,3 +28,31 @@ pub fn camera_follow_player(
         trans.look_at(player_pos, Vec3::Y);
     }
 }
+
+// update our `RayCastSource` with the current cursor position every frame.
+pub fn update_raycast_with_cursor(
+    mut cursor: EventReader<CursorMoved>,
+    mut query: Query<&mut RayCastSource<MyRaycastSet>>,
+) {
+    for mut pick_source in query.iter_mut() {
+        // Grab the most recent cursor event if it exists:
+        if let Some(cursor_latest) = cursor.iter().last() {
+            pick_source.cast_method = RayCastMethod::Screenspace(cursor_latest.position);
+        }
+    }
+}
+
+#[derive(Default)]
+pub struct MouseCoords(pub Vec3);
+
+// Update our `RayCastSource` with the current cursor position every frame.
+pub fn update_mouse_coords(
+    query: Query<&RayCastSource<MyRaycastSet>>,
+    mut coords: ResMut<MouseCoords>,
+) {
+    for pick_source in query.iter() {
+        if let Some((_, intersection)) = pick_source.intersect_top() {
+            coords.0 = intersection.position();
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 3d83b89..c79b4ba 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,16 +1,16 @@
 use bevy::{input::system::exit_on_esc_system, pbr::AmbientLight, prelude::*};
+use bevy_mod_raycast::{build_rays, update_raycast, PluginState, RayCastMesh, RaycastSystem};
 
+mod camera;
+mod columns;
+mod light_balls;
+mod loading;
+mod player;
 mod rendering;
 
-mod light_balls;
-use light_balls::*;
-mod player;
-use player::*;
-mod camera;
 use camera::*;
-mod columns;
-
-mod loading;
+use light_balls::*;
+use player::*;
 
 #[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub enum AppState {
@@ -24,8 +24,31 @@ fn main() {
         .insert_resource(ClearColor(Color::rgb(0.0, 0.0, 0.0)))
         .add_plugins(rendering::CustomPlugins)
         .init_resource::<LightBallMaterials>()
+        .init_resource::<MouseCoords>()
+        .init_resource::<FloatingOrbsInterpolationState>()
         .init_resource::<loading::LoadedAssets>()
         .add_state(AppState::Loading)
+        // raycasting
+        .init_resource::<PluginState<MyRaycastSet>>()
+        .add_system_to_stage(
+            CoreStage::PostUpdate,
+            build_rays::<MyRaycastSet>
+                .system()
+                .label(RaycastSystem::BuildRays),
+        )
+        .add_system_to_stage(
+            CoreStage::PostUpdate,
+            update_raycast::<MyRaycastSet>
+                .system()
+                .label(RaycastSystem::UpdateRaycast)
+                .after(RaycastSystem::BuildRays),
+        )
+        .add_system_to_stage(
+            CoreStage::PreUpdate,
+            update_raycast_with_cursor
+                .system()
+                .before(RaycastSystem::BuildRays),
+        )
         // loading
         .add_system_set(
             SystemSet::on_update(AppState::Loading).with_system(loading::loading.system()),
@@ -34,8 +57,11 @@ fn main() {
         .add_system_set(SystemSet::on_enter(AppState::Game).with_system(setup.system()))
         .add_system_set(
             SystemSet::on_update(AppState::Game)
+                .with_system(update_mouse_coords.system())
                 .with_system(exit_on_esc_system.system())
                 .with_system(light_movement.system())
+                .with_system(move_light_friends.system())
+                .with_system(update_floating_orbs_interpolation.system())
                 .with_system(move_player.system())
                 .with_system(camera_follow_player.system())
                 .with_system(light_up_ball_when_close_to_player.system()),
@@ -66,12 +92,14 @@ fn setup(
     let floor_material = materials.add(floor_material);
     for i in -10..10 {
         for j in -10..10 {
-            commands.spawn_bundle(PbrBundle {
-                mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
-                material: floor_material.clone(),
-                transform: Transform::from_xyz(100.0 * i as f32, 0.0, 100.0 * j as f32),
-                ..Default::default()
-            });
+            commands
+                .spawn_bundle(PbrBundle {
+                    mesh: meshes.add(Mesh::from(shape::Plane { size: 100.0 })),
+                    material: floor_material.clone(),
+                    transform: Transform::from_xyz(100.0 * i as f32, 0.0, 100.0 * j as f32),
+                    ..Default::default()
+                })
+                .insert(RayCastMesh::<camera::MyRaycastSet>::default());
         }
     }
 
@@ -96,7 +124,5 @@ fn setup(
     }
 
     // camera
-    commands
-        .spawn_bundle(PerspectiveCameraBundle::default())
-        .insert(Camera);
+    spawn_camera(&mut commands);
 }
diff --git a/src/player.rs b/src/player.rs
index 8ac3b7e..c28ec63 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -1,5 +1,7 @@
 use bevy::prelude::*;
 
+use crate::camera::MouseCoords;
+
 pub struct Player;
 pub struct PlayerLight {
     i: u8,
@@ -20,18 +22,23 @@ pub fn spawn_player(
             transform: Transform::from_xyz(0.0, 1.0, 0.0),
             ..Default::default()
         })
-        .insert(Player)
-        .with_children(|parent| {
-            // light
-            let mut light_material: StandardMaterial =
-                Color::rgb(0.737255, 0.560784, 0.560784).into();
-            light_material.metallic = 0.5;
-            light_material.reflectance = 0.5;
-            light_material.emissive = Color::rgb(7.52, 5.72, 5.72);
-            let light_material = materials.add(light_material);
+        .insert(Player);
 
+    // light
+    let mut light_material: StandardMaterial = Color::rgb(0.737255, 0.560784, 0.560784).into();
+    light_material.metallic = 0.5;
+    light_material.reflectance = 0.5;
+    light_material.emissive = Color::rgb(7.52, 5.72, 5.72);
+    let light_material = materials.add(light_material);
+
+    commands
+        .spawn()
+        .insert(LightFriends)
+        .insert(Transform::default())
+        .insert(GlobalTransform::default())
+        .with_children(|children| {
             for i in 0..6 {
-                parent
+                children
                     .spawn_bundle(PbrBundle {
                         mesh: meshes.add(Mesh::from(shape::Icosphere {
                             radius: 0.2,
@@ -54,14 +61,56 @@ pub fn spawn_player(
         });
 }
 
+pub struct LightFriends;
+pub fn move_light_friends(
+    mut query: Query<(&mut Transform, &LightFriends)>,
+    player: Query<(&Transform, &Player), Without<LightFriends>>,
+    coords: Res<MouseCoords>,
+    interpolation: Res<FloatingOrbsInterpolationState>,
+    time: Res<Time>,
+) {
+    let player_pos = if let Some(player) = player.iter().next() {
+        player.0.translation
+    } else {
+        return;
+    };
+
+    for (mut trans, _light) in query.iter_mut() {
+        // interpolate between player pos and mouse click pos
+        let i = interpolation.0;
+        let center = i * coords.0 + (1.0 - i) * player_pos;
+
+        let mut d = trans.translation - center;
+        d.y = 0.0;
+        trans.translation -= d * time.delta_seconds();
+    }
+}
+
 pub fn light_movement(mut query: Query<(&mut Transform, &PlayerLight)>, time: Res<Time>) {
     let t = time.seconds_since_startup();
     for (mut trans, light) in query.iter_mut() {
         let i = light.i as f64;
         let i2 = i / 2.0;
-        trans.translation.y = 3.0 * (t * 1.1 * i2 + i).sin() as f32 + 4.0;
-        trans.translation.x = 5.0 * i2 as f32 * (t * 0.4 * i2 + i).cos() as f32;
-        trans.translation.z = 5.0 * (t * 0.4 * i + i).sin() as f32;
+        trans.translation = Vec3::new(
+            5.0 * i2 as f32 * (t * 0.4 * i2 + i).cos() as f32,
+            3.0 * (t * 1.1 * i2 + i).sin() as f32 + 4.0,
+            5.0 * (t * 0.4 * i + i).sin() as f32,
+        );
+    }
+}
+
+#[derive(Default)]
+pub struct FloatingOrbsInterpolationState(f32);
+pub fn update_floating_orbs_interpolation(
+    mut state: ResMut<FloatingOrbsInterpolationState>,
+    input: Res<Input<MouseButton>>,
+    time: Res<Time>,
+) {
+    let ds = time.delta_seconds();
+    if input.pressed(MouseButton::Left) {
+        state.0 = (state.0 + 0.5 * ds).clamp(0.0, 1.0);
+    } else {
+        state.0 = (state.0 - ds).clamp(0.0, 1.0);
     }
 }
 
@@ -72,9 +121,6 @@ pub fn move_player(
 ) {
     let ds = time.delta_seconds() * 5.0;
 
-    // TODO rotate according to camera position
-    // but make it snap to coord system
-
     for (mut transform, _) in query.iter_mut() {
         if input.pressed(KeyCode::W) {
             transform.translation += Vec3::X * ds;