Call checkSpawns from World instead of from Player

src/main/java/emu/grasscutter/game/GenshinPlayer.java

@@ -695,10 +695,6 @@ public class GenshinPlayer {
 				it.remove();
 			}
 		}
-		// 
-		if (this.getScene() != null && this.getSceneLoadState() == SceneLoadState.LOADED) {
-			this.getScene().checkSpawns(this);
-		}
 		// Ping
 		if (this.getWorld() != null) {
 			// RTT notify - very important to send this often

src/main/java/emu/grasscutter/game/GenshinScene.java

@@ -315,32 +315,31 @@ public class GenshinScene {
 		target.onDeath(attackerId);
 	}
 	
-	// TODO Do not use yet
-	public synchronized void onTick() {
-		for (GenshinPlayer player : this.getPlayers()) {
-			this.checkSpawns(player);
-		}
+	public void onTick() {
+		this.checkSpawns();
 	}
 	
 	// TODO - Test
-	public void checkSpawns(GenshinPlayer player) {
+	public void checkSpawns() {
 		SpatialIndex<SpawnGroupEntry> list = GenshinDepot.getSpawnListById(this.getId());
 		Set<SpawnDataEntry> visible = new HashSet<>();
 		
-		int RANGE = 100;
-		Collection<SpawnGroupEntry> entries = list.query(
-			new double[] {player.getPos().getX() - RANGE, player.getPos().getZ() - RANGE}, 
-			new double[] {player.getPos().getX() + RANGE, player.getPos().getZ() + RANGE}
-		);
-		
-		for (SpawnGroupEntry entry : entries) {
-			for (SpawnDataEntry spawnData : entry.getSpawns()) {
-				visible.add(spawnData);
+		for (GenshinPlayer player : this.getPlayers()) {
+			int RANGE = 100;
+			Collection<SpawnGroupEntry> entries = list.query(
+				new double[] {player.getPos().getX() - RANGE, player.getPos().getZ() - RANGE}, 
+				new double[] {player.getPos().getX() + RANGE, player.getPos().getZ() + RANGE}
+			);
+			
+			for (SpawnGroupEntry entry : entries) {
+				for (SpawnDataEntry spawnData : entry.getSpawns()) {
+					visible.add(spawnData);
+				}
 			}
 		}
 		
 		// World level
-		WorldLevelData worldLevelData = GenshinData.getWorldLevelDataMap().get(player.getWorldLevel());
+		WorldLevelData worldLevelData = GenshinData.getWorldLevelDataMap().get(getWorld().getWorldLevel());
 		int worldLevelOverride = 0;
 		
 		if (worldLevelData != null) {

src/main/java/emu/grasscutter/game/World.java

@@ -37,6 +37,7 @@ import emu.grasscutter.server.packet.send.PacketWorldPlayerInfoNotify;
 import emu.grasscutter.server.packet.send.PacketWorldPlayerRTTNotify;
 import emu.grasscutter.utils.Position;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMaps;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 
 public class World implements Iterable<GenshinPlayer> {
@@ -58,11 +59,13 @@ public class World implements Iterable<GenshinPlayer> {
 	public World(GenshinPlayer player, boolean isMultiplayer) {
 		this.owner = player;
 		this.players = Collections.synchronizedList(new ArrayList<>());
-		this.scenes = new Int2ObjectOpenHashMap<>();
+		this.scenes = Int2ObjectMaps.synchronize(new Int2ObjectOpenHashMap<>());
 		
 		this.levelEntityId = getNextEntityId(EntityIdType.MPLEVEL);
 		this.worldLevel = player.getWorldLevel();
 		this.isMultiplayer = isMultiplayer;
+		
+		this.owner.getServer().registerWorld(this);
 	}
 	
 	public GenshinPlayer getHost() {
@@ -273,6 +276,12 @@ public class World implements Iterable<GenshinPlayer> {
     	}
 	}
 	
+	public void onTick() {
+		for (GenshinScene scene : this.getScenes().values()) {
+			scene.onTick();
+		}
+	}
+	
 	public void close() {
 		
 	}

src/main/java/emu/grasscutter/server/game/GameServer.java

@@ -10,6 +10,7 @@ import emu.grasscutter.command.CommandMap;
 import emu.grasscutter.database.DatabaseHelper;
 import emu.grasscutter.game.Account;
 import emu.grasscutter.game.GenshinPlayer;
+import emu.grasscutter.game.World;
 import emu.grasscutter.game.dungeons.DungeonManager;
 import emu.grasscutter.game.gacha.GachaManager;
 import emu.grasscutter.game.managers.ChatManager;
@@ -26,6 +27,7 @@ public final class GameServer extends MihoyoKcpServer {
 	private final GameServerPacketHandler packetHandler;
 
 	private final Map<Integer, GenshinPlayer> players;
+	private final Set<World> worlds;
 	
 	private final ChatManager chatManager;
 	private final InventoryManager inventoryManager;
@@ -50,6 +52,7 @@ public final class GameServer extends MihoyoKcpServer {
 		this.address = address;
 		this.packetHandler = new GameServerPacketHandler(PacketHandler.class);
 		this.players = new ConcurrentHashMap<>();
+		this.worlds = Collections.synchronizedSet(new HashSet<>());
 		
 		this.chatManager = new ChatManager(this);
 		this.inventoryManager = new InventoryManager(this);
@@ -84,6 +87,10 @@ public final class GameServer extends MihoyoKcpServer {
 		return players;
 	}
 
+	public Set<World> getWorlds() {
+		return worlds;
+	}
+
 	public ChatManager getChatManager() {
 		return chatManager;
 	}
@@ -161,12 +168,32 @@ public final class GameServer extends MihoyoKcpServer {
 	}
 	
 	public void onTick() throws Exception {
+		Iterator<World> it = this.getWorlds().iterator();
+		while (it.hasNext()) {
+			World world = it.next();
+			
+			if (world.getPlayerCount() == 0) {
+				it.remove();
+			}
+			
+			world.onTick();
+		}
+		
 		for (GenshinPlayer player : this.getPlayers().values()) {
 			player.onTick();
 		}
 
 		OnGameServerTick.post(new GameServerTickEvent());
 	}
+	
+	public void registerWorld(World world) {
+		this.getWorlds().add(world);
+	}
+	
+	public void deregisterWorld(World world) {
+		// TODO Auto-generated method stub
+		
+	}
 
 	@Override
 	public void onStartFinish() {