diff --git a/src/game.rs b/src/game.rs
index b265f59..01273c3 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,3 +1,4 @@
+use glam::Vec2;
 use glium::{Surface, uniform};
 use glium::uniforms::{Sampler, MinifySamplerFilter, MagnifySamplerFilter};
 use glium::glutin::{
@@ -22,6 +23,7 @@ use shaders::{Programs, chunk::Vertex as ChunkVertex};
 use camera::Camera;
 use controller::Controls;
 use world::World;
+use options::GameOptions;
 
 struct State {
   pub camera: Camera,
@@ -47,6 +49,8 @@ pub fn run() {
   let programs = Programs::compile_all(&display);
   log::info!("loading assets");
   let assets = Assets::load_all_sync(&display);
+  log::info!("init game options");
+  let options = GameOptions::default();
   log::info!("init game state");
   let mut state = State::init();
   state.camera.position = [0., 0., -1.];
@@ -100,18 +104,32 @@ pub fn run() {
       _ => return
     }
     
+    //Calculate delta time
     let now = Instant::now();
     let dt = (now - last_render).as_secs_f32();
     last_render = now;
 
+    //Update controls
     state.controls.calculate(dt).apply_to_camera(&mut state.camera);
 
+    //Load new chunks
+    
+    state.world.update_loaded_chunks(
+      Vec2::new(state.camera.position[0], state.camera.position[2]), 
+      &options, 
+      &display
+    );
+
+    //Start drawing
     let mut target = display.draw();
+    target.clear_color_and_depth((0.5, 0.5, 1., 1.), 1.);
+
+    //Compute camera
     let target_dimensions = target.get_dimensions();
     let perspective = state.camera.perspective_matrix(target_dimensions);
     let view = state.camera.view_matrix();
-    target.clear_color_and_depth((0.5, 0.5, 1., 1.), 1.);
     
+    //Draw example triangle
     target.draw(
       &vertex_buffer,
       glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList), 
@@ -129,6 +147,8 @@ pub fn run() {
       }, 
       &Default::default()
     ).unwrap();
+
+    //Finish drawing
     target.finish().unwrap();
   });
 }
diff --git a/src/game/world.rs b/src/game/world.rs
index 74c3e3b..d3a8708 100644
--- a/src/game/world.rs
+++ b/src/game/world.rs
@@ -1,11 +1,13 @@
 use glam::{Vec2, IVec2};
+use glium::Display;
 use std::collections::HashMap;
 use crate::game::options::GameOptions;
 
 mod chunk;
 mod thread;
 
-use chunk::{Chunk, CHUNK_SIZE};
+use chunk::{Chunk, ChunkState, CHUNK_SIZE};
+use thread::WorldThreading;
 
 const POSITIVE_X_NEIGHBOR: usize = 0;
 const NEGATIVE_X_NEIGHBOR: usize = 1;
@@ -13,7 +15,8 @@ const POSITIVE_Z_NEIGHBOR: usize = 2;
 const NEGATIVE_Z_NEIGHBOR: usize = 3;
 
 pub struct World {
-  pub chunks: HashMap<IVec2, Chunk>
+  pub chunks: HashMap<IVec2, Chunk>,
+  pub thread: WorldThreading,
 }
 impl World {
   pub fn chunk_neighbors(&self, position: IVec2) -> [Option<&Chunk>; 4] {
@@ -26,13 +29,56 @@ impl World {
   }
   pub fn new() -> Self {
     Self {
-      chunks: HashMap::new()
+      chunks: HashMap::new(),
+      thread: WorldThreading::new(),
     }
   }
-  pub fn update_loaded_chunks(&mut self, around_position: Vec2, game_opt: &GameOptions) {
-    let render_dist = game_opt.render_distance as i32;
+  pub fn update_loaded_chunks(&mut self, around_position: Vec2, options: &GameOptions, display: &Display) {
+    let render_dist = options.render_distance as i32 + 1;
     let inside_chunk = (around_position / CHUNK_SIZE as f32).as_ivec2();
-    
-    todo!()
+    //Mark all chunks for unload
+    for (_, chunk) in &mut self.chunks {
+      chunk.desired = ChunkState::Unload;
+    }
+    //Load new/update chunks in range
+    for x in -render_dist..=render_dist {
+      for z in -render_dist..=render_dist {
+        let offset = IVec2::new(x, z);
+        let position = inside_chunk + offset;
+        if !self.chunks.contains_key(&position) {
+          self.chunks.insert(position, Chunk::new(position));
+        }
+        let chunk = self.chunks.get_mut(&position).unwrap();
+        if x == 0 || z == 0 || x == render_dist || z == render_dist {
+          chunk.desired = ChunkState::Loaded;
+        } else {
+          chunk.desired = ChunkState::Rendered;
+        }
+      }
+    }
+    //State up/downgrades are handled here!
+    self.chunks.retain(|&position, chunk| {
+      match chunk.desired {
+        ChunkState::Unload => {
+          return false
+        },
+        ChunkState::Nothing => {
+          chunk.block_data = None;
+          chunk.vertex_buffer = None;
+          chunk.state = ChunkState::Nothing;
+        },
+        ChunkState::Loaded if matches!(chunk.state, ChunkState::Nothing) => {
+          self.thread.queue_load(position);
+        },
+        ChunkState::Loaded if matches!(chunk.state, ChunkState::Rendered) => {
+          chunk.vertex_buffer = None;
+          chunk.state = ChunkState::Loaded;
+        },
+        _ => ()
+      }
+      true
+    });
+    //Apply changes from threads
+    self.thread.apply_tasks(&mut self.chunks, display);
   }
 }
diff --git a/src/game/world/chunk.rs b/src/game/world/chunk.rs
index 1830b61..520c2cf 100644
--- a/src/game/world/chunk.rs
+++ b/src/game/world/chunk.rs
@@ -9,6 +9,7 @@ pub const CHUNK_SIZE: usize = 16;
 pub const CHUNK_HEIGHT: usize = 255;
 
 pub enum ChunkState {
+  Unload,
   Nothing,
   Loaded,
   Rendered,
@@ -20,7 +21,7 @@ pub type ChunkMesh = VertexBuffer<ChunkVertex>;
 pub struct Chunk {
   pub position: IVec2,
   pub block_data: Option<ChunkData>,
-  pub vertex_buffer: Option<ChunkMesh>,
+  pub vertex_buffer: Option<(bool, ChunkMesh)>,
   pub state: ChunkState,
   pub desired: ChunkState,
 }
diff --git a/src/game/world/thread.rs b/src/game/world/thread.rs
index 0b01299..38e59d3 100644
--- a/src/game/world/thread.rs
+++ b/src/game/world/thread.rs
@@ -1,22 +1,28 @@
 use glam::IVec2;
+use glium::{Display, VertexBuffer};
 use std::{
   thread::{self, JoinHandle}, 
   collections::HashMap,
   mem
 };
 use super::chunk::{Chunk, ChunkData, ChunkState};
+use crate::game::shaders::chunk::Vertex as ChunkVertex;
 
 mod world_gen;
 mod mesh_gen;
 
-struct WorldThreading {
+#[derive(Default)]
+pub struct WorldThreading {
   //drain_filter is not stable yet so
   //Options are needed here to take ownership, 
   //None values should never appear here!
   pub load_tasks: HashMap<IVec2, Option<JoinHandle<ChunkData>>>,
-  pub mesh_tasks: HashMap<IVec2, Option<JoinHandle<ChunkData>>>,
+  pub mesh_tasks: HashMap<IVec2, Option<JoinHandle<Vec<ChunkVertex>>>>,
 }
 impl WorldThreading {
+  pub fn new() -> Self {
+    Self::default()
+  }
   pub fn is_done(&self) -> bool {
     self.load_tasks.is_empty() && 
     self.mesh_tasks.is_empty()
@@ -32,7 +38,24 @@ impl WorldThreading {
       log::warn!("load: discarded {}, reason: new task started", position);
     }
   }
-  pub fn apply_tasks(&mut self, chunks: &mut HashMap<IVec2, Chunk>) {
+  pub fn queue_mesh(&mut self, chunk: &Chunk, neighbors: [&Chunk; 4]) {
+    let position = chunk.position;
+    let data = chunk.block_data.expect("Chunk has no mesh!");
+    let neighbor_data = [
+      neighbors[0].block_data.expect("Chunk has no mesh!"),
+      neighbors[1].block_data.expect("Chunk has no mesh!"),
+      neighbors[2].block_data.expect("Chunk has no mesh!"),
+      neighbors[3].block_data.expect("Chunk has no mesh!"),
+    ];
+    let handle = thread::spawn(move || {
+      mesh_gen::generate_mesh(position, data, neighbor_data)
+    });
+    if self.mesh_tasks.insert(chunk.position, Some(handle)).is_some() {
+      log::warn!("mesh: discarded {}, reason: new task started", chunk.position);
+    }
+  }
+  pub fn apply_tasks(&mut self, chunks: &mut HashMap<IVec2, Chunk>, display: &Display) {
+    //LOAD TASKS
     self.load_tasks.retain(|position, handle| {
       if !chunks.contains_key(position) {
         log::warn!("load: discarded {}, reason: chunk no longer exists", position);
@@ -54,5 +77,31 @@ impl WorldThreading {
       chunk.state = ChunkState::Loaded;
       false
     });
+    //MESH TASKS
+    self.mesh_tasks.retain(|position, handle| {
+      if !chunks.contains_key(position) {
+        log::warn!("mesh: discarded {}, reason: chunk no longer exists", position);
+        return false
+      }
+      if !matches!(chunks.get(position).unwrap().desired, ChunkState::Rendered) {
+        log::warn!("mesh: discarded {}, reason: state undesired", position);
+        return false
+      }
+      if !handle.as_ref().expect("Something went terribly wrong").is_finished() {
+        //task not finished yet, keep it and wait
+        return true
+      }
+      log::info!("mesh: done {}", position);
+      let handle = mem::take(handle).unwrap();
+      let data = handle.join().unwrap();
+      let chunk = chunks.get_mut(position).unwrap();
+      chunk.vertex_buffer = Some(( 
+        true,
+        VertexBuffer::immutable(display, &data).expect("Failed to build VertexBuffer")
+      ));
+      chunk.state = ChunkState::Rendered;
+      false
+    });
+
   }
 }
diff --git a/src/game/world/thread/mesh_gen.rs b/src/game/world/thread/mesh_gen.rs
index 8f2d22b..70fdd06 100644
--- a/src/game/world/thread/mesh_gen.rs
+++ b/src/game/world/thread/mesh_gen.rs
@@ -1,5 +1,7 @@
-use crate::game::world::chunk::Chunk;
+use glam::IVec2;
+use crate::game::world::chunk::{Chunk, ChunkData};
+use crate::game::shaders::chunk::Vertex as ChunkVertex;
 
-pub fn generate_mesh(chunk: &Chunk, neighbors: [&Chunk; 4]) {
-  
+pub fn generate_mesh(position: IVec2, chunk_data: ChunkData, neighbors: [ChunkData; 4]) -> Vec<ChunkVertex> {
+  vec![]
 }