Fix bug

crates/bevy_tiles/src/commands.rs

@@ -259,7 +259,13 @@ where
     if let Some(chunk_info) = remove_chunk::<N>(world, map, chunk_c) {
         chunk_info
     } else {
-        let chunk_id = world.spawn((ChunkCoord::from(chunk_c), InMap(map_id))).id();
+        let chunk_id = world
+            .spawn((
+                ChunkCoord::from(chunk_c),
+                MapLabel::<L>::default(),
+                InMap(map_id),
+            ))
+            .id();
         map.chunks.insert(chunk_c.into(), chunk_id);
         (chunk_id, Chunk::new(L::CHUNK_SIZE.pow(N as u32)))
     }

crates/bevy_tiles_render/examples/hello_tile.rs

@@ -1,5 +1,7 @@
+use std::iter::repeat_with;
+
 use bevy::{
-    app::{App, Startup},
+    app::{App, Startup, Update},
     core_pipeline::core_2d::Camera2dBundle,
     diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
     ecs::system::Commands,
@@ -18,6 +20,7 @@ use bevy_tiles_render::{
     maps::{TileGridSize, TileMapRenderer, TileMapRenderingBundle, TileSize},
     TilesRenderPlugin,
 };
+use rand::Rng;
 
 fn main() {
     App::new()
@@ -28,13 +31,14 @@ fn main() {
         ))
         .add_plugins((TilesPlugin, TilesRenderPlugin))
         .add_systems(Startup, spawn)
+        .add_systems(Update, change_map)
         .run();
 }
 
 struct GameLayer;
 
 impl TileMapLabel for GameLayer {
-    const CHUNK_SIZE: usize = 32;
+    const CHUNK_SIZE: usize = 128;
 }
 
 fn spawn(mut commands: Commands) {
@@ -46,11 +50,6 @@ fn spawn(mut commands: Commands) {
         ..Default::default()
     });
 
-    tile_commands.spawn_tile_batch(
-        CoordIterator::new([-1000, -1000], [1000, 1000]),
-        move |_| (),
-    );
-
     commands.spawn(Camera2dBundle {
         projection: OrthographicProjection {
             scale: 10.0,
@@ -61,3 +60,21 @@ fn spawn(mut commands: Commands) {
         ..Default::default()
     });
 }
+
+fn change_map(mut commands: Commands) {
+    let mut rng = rand::thread_rng();
+    let changes = rng.gen_range(500..1000);
+    let mut tile_commands = commands.tiles::<GameLayer, 2>();
+
+    let spawn = rng.gen_bool(0.5);
+
+    let tiles = Vec::from_iter(
+        repeat_with(|| [rng.gen_range(-1000..1000), rng.gen_range(-1000..1000)]).take(changes),
+    );
+
+    if spawn {
+        tile_commands.spawn_tile_batch(tiles, |_| ())
+    } else {
+        tile_commands.despawn_tile_batch(tiles)
+    }
+}

crates/bevy_tiles_render/src/extract.rs

@@ -84,9 +84,12 @@ pub fn extract_chunks(
     commands.insert_or_spawn_batch(extracted_maps);
 
     let chunks_len = chunks.iter().len();
-    let mut extracted_chunks = ArrayQueue::new(chunks_len);
-    let mut extracted_saved_chunks = ArrayQueue::new(chunks_len);
-    let mut chunk_edges = ArrayQueue::new(chunks_len);
+    if chunks_len == 0 {
+        return;
+    }
+    let extracted_chunks = ArrayQueue::new(chunks_len);
+    let extracted_saved_chunks = ArrayQueue::new(chunks_len);
+    let chunk_edges = ArrayQueue::new(chunks_len);
 
     changed_tiles.iter().for_each(|in_chunk| {
         saved_chunks.remove(&in_chunk.get());