diff --git a/Cargo.toml b/Cargo.toml
index 0ceca43..2b84644 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [features]
 debug = ["save/debug"]
 render = ["bevy/bevy_asset", "bevy/bevy_winit", "bevy/render", "save/render"]
-default = ["render"]
+default = ["render", "debug"]
 
 [dependencies.save]
 path = "save"
diff --git a/assets/JuliaMono.ttf b/assets/JuliaMono.ttf
new file mode 100644
index 0000000..f37efba
Binary files /dev/null and b/assets/JuliaMono.ttf differ
diff --git a/save/src/world.rs b/save/src/world.rs
index 12fd343..458304e 100644
--- a/save/src/world.rs
+++ b/save/src/world.rs
@@ -71,6 +71,13 @@ impl Debug for World {
     }
 }
 
+#[derive(Debug, Copy, Clone, Default)]
+pub struct Biome {
+    pub altitude: f32,
+    pub rainfall: f32,
+    pub temperature: f32,
+}
+
 #[derive(Debug, Copy, Clone, Default)]
 pub struct TerrainCell {
     pub altitude: f32,
@@ -120,7 +127,7 @@ impl World {
         if let Err(err) = self.generate_altitude() {
             return Err(WorldGenError::CartesianError(err));
         }
-        if let Err(err) = self.generate_rainfall_alt() {
+        if let Err(err) = self.generate_rainfall() {
             return Err(WorldGenError::CartesianError(err));
         }
 
@@ -280,6 +287,7 @@ impl World {
         Self::MIN_ALTITUDE + (raw_altitude * Self::ALTITUDE_SPAN)
     }
 
+    /*
     fn generate_rainfall_alt(&mut self) -> Result<(), CartesianError> {
         let max_cycles = self.width / 5;
 
@@ -289,13 +297,12 @@ impl World {
 
         for _ in 0..max_cycles {
             for x in 0..self.width {
-                let mut prev_x = (x - 1 + self.width) % self.width;
-
                 for y in 0..self.height {
+                    let mut prev_x = (x - 1 + self.width) % self.width;
                     let prev_y = if y < self.height / 4 {
-                        prev_x = (x + 1) % self.width;
                         y + 1
                     } else if y < self.height / 2 {
+                        prev_x = (x + 1) % self.width;
                         y - 1
                     } else if y < (self.height * 3) / 4 {
                         prev_x = (x + 1) % self.width;
@@ -304,15 +311,12 @@ impl World {
                         y - 1
                     };
 
-                    let width_factor = f32::sin(PI * y as f32 / self.height as f32);
-
                     let mut cell = self.terrain[y as usize][x as usize];
                     cell.previous_rain_accumulated = cell.rain_accumulated;
                     cell.rain_accumulated = 0.0;
 
                     if cell.altitude <= 0.0 {
-                        cell.rain_accumulated +=
-                            width_factor * ACCUMULATED_RAIN_FACTOR * Self::MAX_RAINFALL;
+                        cell.rain_accumulated += ACCUMULATED_RAIN_FACTOR * Self::MAX_RAINFALL;
                     }
 
                     let prev_cell = self.terrain[prev_y as usize][prev_x as usize];
@@ -342,8 +346,8 @@ impl World {
 
         Ok(())
     }
+    */
 
-    /*
     fn generate_rainfall(&mut self) -> Result<(), CartesianError> {
         let offset = Self::random_offset_vector();
         const RADIUS: f32 = 2.0;
@@ -351,14 +355,16 @@ impl World {
         for y in 0..self.terrain.len() {
             let alpha = (y as f32 / self.height as f32) * PI;
             for x in 0..self.terrain[y].len() {
-                let mut cell = self.terrain[y][x];
                 let beta = (x as f32 / self.width as f32) * TAU;
 
-                let base_rainfall = Self::calculate_rainfall(
-                    self.random_noise_from_polar_coordinates(alpha, beta, RADIUS, offset)?,
-                );
+                let value =
+                    self.random_noise_from_polar_coordinates(alpha, beta, RADIUS, offset)?;
+
+                let mut cell = &mut self.terrain[y][x];
+
+                let base_rainfall = Self::calculate_rainfall(value);
                 let altitude_factor = f32::clamp(
-                    cell.altitude / Self::MAX_ALTITUDE * Self::RAINFALL_ALTITUDE_FACTOR,
+                    (cell.altitude / Self::MAX_ALTITUDE) * Self::RAINFALL_ALTITUDE_FACTOR,
                     0.0,
                     1.0,
                 );
@@ -371,8 +377,10 @@ impl World {
     }
 
     fn calculate_rainfall(raw_rainfall: f32) -> f32 {
-        ((raw_rainfall * Self::RAINFALL_ALTITUDE_FACTOR) + Self::MIN_RAINFALL)
-            .clamp(0.0, Self::MAX_RAINFALL)
+        f32::clamp(
+            (raw_rainfall * Self::RAINFALL_SPAN) + Self::MIN_RAINFALL,
+            0.0,
+            Self::MAX_RAINFALL,
+        )
     }
-    */
 }
diff --git a/save/src/world_manager.rs b/save/src/world_manager.rs
index 0d09992..3cb3831 100644
--- a/save/src/world_manager.rs
+++ b/save/src/world_manager.rs
@@ -1,17 +1,42 @@
 #[cfg(feature = "render")]
 use crate::TerrainCell;
 use crate::{World, WorldGenError};
+use bevy::log::debug;
 #[cfg(feature = "render")]
-use bevy::render::color::Color;
+use bevy::{
+    asset::HandleId,
+    render::{color::Color, texture::Image},
+};
 use rand::random;
 
 #[derive(Debug)]
 pub struct WorldManager {
+    #[cfg(feature = "render")]
+    pub image_handle_id: HandleId,
     world: Option<World>,
+    #[cfg(feature = "render")]
+    rainfall_visible: bool,
 }
+
 impl WorldManager {
     pub fn new() -> WorldManager {
-        WorldManager { world: None }
+        Self {
+            #[cfg(feature = "render")]
+            image_handle_id: HandleId::default::<Image>(),
+            world: None,
+            rainfall_visible: false,
+        }
+    }
+
+    #[cfg(feature = "render")]
+    pub fn toggle_rainfall(&mut self) {
+        if self.rainfall_visible {
+            debug!("Turning rainfall off");
+        } else {
+            debug!("Turning rainfall on");
+            debug!("World: {:#?}", self.world);
+        }
+        self.rainfall_visible = !self.rainfall_visible;
     }
 
     pub fn get_world(&self) -> Option<&World> {
@@ -27,9 +52,13 @@ impl WorldManager {
     }
 
     #[cfg(feature = "render")]
-    fn generate_color(cell: &TerrainCell) -> Color {
+    fn generate_color(cell: &TerrainCell, show_rainfall: bool) -> Color {
         let altitude_color = Self::altitude_contour_color(cell.altitude);
-        let rainfall_color = Self::rainfall_color(cell.rainfall);
+        let rainfall_color = if show_rainfall {
+            Self::rainfall_color(cell.rainfall)
+        } else {
+            Color::BLACK
+        };
 
         let normalized_rainfall = Self::normalize_rainfall(cell.rainfall);
 
@@ -73,20 +102,15 @@ impl WorldManager {
 
     #[cfg(feature = "render")]
     fn rainfall_color(rainfall: f32) -> Color {
-        if rainfall <= 0.0 {
-            Color::BLACK
-        } else {
-            let mult = rainfall / World::MAX_RAINFALL;
-            Color::rgb(0.0, mult, 0.0)
-        }
+        Color::rgb(0.0, Self::normalize_rainfall(rainfall), 0.0)
     }
 
     #[cfg(feature = "render")]
     fn normalize_rainfall(rainfall: f32) -> f32 {
         if rainfall <= 0.0 {
-            rainfall
+            0.0
         } else {
-            rainfall / World::MAX_ALTITUDE
+            rainfall / World::MAX_RAINFALL
         }
     }
 
@@ -99,7 +123,7 @@ impl WorldManager {
 
                 terrain_cells
                     .iter()
-                    .map(|cell| Self::generate_color(cell))
+                    .map(|cell| Self::generate_color(cell, self.rainfall_visible))
                     .collect()
             }
         }
diff --git a/src/main.rs b/src/main.rs
index 4ee0334..53a8695 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,34 +34,93 @@
 
 mod plugins;
 
-use bevy::app::App;
+use bevy::{
+    app::App,
+    log::{debug, LogSettings},
+    utils::tracing::Level,
+};
 #[cfg(feature = "render")]
 use bevy::{
-    asset::Assets,
+    asset::{AssetServer, Assets},
     core_pipeline::core_2d::Camera2dBundle,
     ecs::{
         change_detection::ResMut,
-        system::{Commands, Res},
+        query::{Changed, With},
+        system::{Commands, Query, Res},
     },
+    hierarchy::BuildChildren,
     render::{
+        color::Color,
         render_resource::{
             Extent3d, TextureDescriptor, TextureDimension, TextureFormat, TextureUsages,
         },
         texture::{Image, ImageSettings},
+        view::Visibility,
+    },
+    ui::{
+        entity::{ButtonBundle, ImageBundle, TextBundle},
+        widget::Button,
+        AlignItems, Interaction, JustifyContent, Size, Style, UiColor, UiImage, UiRect, Val,
     },
-    ui::{entity::ImageBundle, Size, Style, UiImage, Val},
     utils::default,
-    window::WindowDescriptor,
+    window::{CursorIcon, WindowDescriptor, Windows},
     winit::WinitSettings,
 };
 use plugins::WorldPlugins;
 use save::*;
 
 #[cfg(feature = "render")]
-fn generate_texture(
+fn refresh_world_texture(images: &mut Assets<Image>, world_manager: &WorldManager) {
+    debug!("refreshing world texture");
+    let image_handle = images.get_handle(world_manager.image_handle_id);
+    images.get_mut(&image_handle).unwrap().data = world_manager.world_color_bytes();
+}
+
+const NORMAL_BUTTON: Color = Color::rgb(0.15, 0.15, 0.15);
+const HOVERED_BUTTON: Color = Color::rgb(0.25, 0.25, 0.25);
+const PRESSED_BUTTON: Color = Color::rgb(0.35, 0.60, 0.35);
+#[cfg(feature = "render")]
+fn handle_button_interaction(
+    mut interaction_query: Query<
+        '_,
+        '_,
+        (&Interaction, &mut UiColor /*, &Children*/),
+        (Changed<Interaction>, With<Button>),
+    >,
+    // mut text_query: Query<'_, '_, &mut Text>,
+    mut windows: ResMut<'_, Windows>,
+    mut images: ResMut<'_, Assets<Image>>,
+    mut world_manager: ResMut<'_, WorldManager>,
+) {
+    for (interaction, mut color /*, children*/) in &mut interaction_query {
+        // let mut text = text_query.get_mut(children[0]).unwrap();
+
+        match *interaction {
+            Interaction::Clicked => {
+                windows.primary_mut().set_cursor_icon(CursorIcon::Default);
+                *color = PRESSED_BUTTON.into();
+                debug!("Toggling rainfall");
+                world_manager.toggle_rainfall();
+                refresh_world_texture(&mut images, &world_manager)
+            }
+            Interaction::Hovered => {
+                windows.primary_mut().set_cursor_icon(CursorIcon::Hand);
+                *color = HOVERED_BUTTON.into();
+            }
+            Interaction::None => {
+                windows.primary_mut().set_cursor_icon(CursorIcon::Default);
+                *color = NORMAL_BUTTON.into();
+            }
+        }
+    }
+}
+
+#[cfg(feature = "render")]
+fn generate_graphics(
     mut commands: Commands<'_, '_>,
     mut images: ResMut<'_, Assets<Image>>,
-    world_manager: Res<'_, WorldManager>,
+    mut world_manager: ResMut<'_, WorldManager>,
+    asset_server: Res<'_, AssetServer>,
 ) {
     let world = world_manager.get_world().unwrap();
 
@@ -82,16 +141,53 @@ fn generate_texture(
         },
         ..default()
     });
+    world_manager.image_handle_id = image_handle.id;
 
     _ = commands.spawn_bundle(Camera2dBundle::default());
-    _ = commands.spawn_bundle(ImageBundle {
-        style: Style {
-            size: Size::new(Val::Auto, Val::Auto),
+    _ = commands
+        .spawn_bundle(ImageBundle {
+            style: Style {
+                size: Size::new(Val::Percent(100.0), Val::Auto),
+                ..default()
+            },
+            image: UiImage(image_handle),
             ..default()
-        },
-        image: UiImage(image_handle),
-        ..default()
-    });
+        })
+        .with_children(|world_map| {
+            _ = world_map
+                .spawn_bundle(ButtonBundle {
+                    button: Button,
+                    style: Style {
+                        align_items: AlignItems::Center,
+                        justify_content: JustifyContent::Center,
+                        margin: UiRect {
+                            left: Val::Auto,
+                            right: Val::Px(20.0),
+                            top: Val::Auto,
+                            bottom: Val::Px(20.0),
+                            ..default()
+                        },
+                        padding: UiRect::all(Val::Px(2.0)),
+                        ..default()
+                    },
+                    color: NORMAL_BUTTON.into(),
+                    visibility: Visibility::visible(),
+                    ..default()
+                })
+                .with_children(|button| {
+                    _ = button.spawn_bundle(TextBundle {
+                        text: bevy::text::Text::from_section(
+                            "Toggle rainfall",
+                            bevy::text::TextStyle {
+                                font: asset_server.load("JuliaMono.ttf"),
+                                font_size: 20.0,
+                                color: Color::WHITE,
+                            },
+                        ),
+                        ..default()
+                    });
+                });
+        });
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
@@ -112,12 +208,29 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 resizable: true,
                 ..default()
             })
-            .add_startup_system(generate_texture);
+            .add_startup_system(generate_graphics)
+            .add_system(handle_button_interaction);
     }
     #[cfg(not(feature = "render"))]
     {
         _ = manager.new_world()?
     }
+
+    #[cfg(feature = "debug")]
+    {
+        _ = app.insert_resource(LogSettings {
+            level: Level::DEBUG,
+            ..default()
+        });
+    }
+    #[cfg(not(feature = "debug"))]
+    {
+        _ = app.insert_resource(LogSettings {
+            level: Level::WARN,
+            ..default()
+        });
+    }
+
     app.insert_resource(manager).add_plugins(WorldPlugins).run();
 
     Ok(())
diff --git a/src/plugins.rs b/src/plugins.rs
index b3e7222..61c5bcd 100644
--- a/src/plugins.rs
+++ b/src/plugins.rs
@@ -18,8 +18,8 @@ impl PluginGroup for WorldPlugins {
         #[cfg(feature = "render")]
         {
             use bevy::{
-                asset::AssetPlugin, core_pipeline::CorePipelinePlugin, input::InputPlugin,
-                render::RenderPlugin, sprite::SpritePlugin, text::TextPlugin,
+                asset::AssetPlugin, core_pipeline::CorePipelinePlugin, hierarchy::HierarchyPlugin,
+                input::InputPlugin, render::RenderPlugin, sprite::SpritePlugin, text::TextPlugin,
                 transform::TransformPlugin, ui::UiPlugin, window::WindowPlugin, winit::WinitPlugin,
             };
             _ = group
@@ -28,7 +28,7 @@ impl PluginGroup for WorldPlugins {
                 .add(InputPlugin::default())
                 .add(WindowPlugin::default())
                 .add(AssetPlugin::default())
-                // scene
+                .add(HierarchyPlugin::default())
                 .add(WinitPlugin::default())
                 .add(RenderPlugin::default())
                 .add(CorePipelinePlugin::default())