One chunk render distance

[/u/AllDayWarrior]

Hello everyone,

I am trying to create a minecraft paper 1.21 plugin that makes you see only the chunk you are standing in and all other chunks including entities and players should be invisible. When you walk into a new chunk the old one should be invisible and the new one visible. I am not really a minecraft plugin developer so I am trying to get ai to make it for me. As of now I managed to make only 1 chunk visible and when I hit entities into the other chunks they dissapear. The only problem is that when I try to enter a new chunk I get an error in the console. When I log out in a new chunk which is still invisible and log back in it is visible though. But I want it to be doing that without having to relog. I will post my java code along with the xml and the console error when trying to load a new chunk in. (Plugin works with protocollib)

Java: package com.example.renderdistanceLimiter;

import com.comphenix.protocol.PacketType; import com.comphenix.protocol.ProtocolLibrary; import com.comphenix.protocol.ProtocolManager; import com.comphenix.protocol.events.PacketAdapter; import com.comphenix.protocol.events.PacketContainer; import com.comphenix.protocol.events.PacketEvent; import net.kyori.adventure.text.Component; import org.bukkit.Bukkit; import org.bukkit.Chunk; import org.bukkit.Location; import org.bukkit.World; import org.bukkit.command.Command; import org.bukkit.command.CommandSender; import org.bukkit.command.TabCompleter; import org.bukkit.entity.Entity; import org.bukkit.entity.Player; import org.bukkit.event.EventHandler; import org.bukkit.event.Listener; import org.bukkit.event.player.*; import org.bukkit.plugin.java.JavaPlugin; import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable;

import java.lang.reflect.InvocationTargetException; import java.util.*;

public class RenderDistanceLimiter extends JavaPlugin implements Listener, TabCompleter {

private ProtocolManager protocolManager; private final Set<UUID> exempt = new HashSet<>(); private final Map<Player, Set<Integer>> chunkEntities = new HashMap<>(); private final Map<UUID, int[]> crouchLoaded = new HashMap<>(); @Override public void onEnable() { protocolManager = ProtocolLibrary.getProtocolManager(); Bukkit.getPluginManager().registerEvents(this, this); this.getCommand("onechunk").setTabCompleter(this); protocolManager.addPacketListener(new PacketAdapter(this, PacketType.Play.Server.MAP_CHUNK) { @Override public void onPacketSending(PacketEvent event) { Player player = event.getPlayer(); Location playerLocation = player.getLocation(); Chunk playerChunk = playerLocation.getChunk(); int chunkX = event.getPacket().getIntegers().read(0); int chunkZ = event.getPacket().getIntegers().read(1); if (chunkX != playerChunk.getX() || chunkZ != playerChunk.getZ()) { event.setCancelled(true); } } }); getLogger().info("[RenderDistanceLimiter]: Plugin is enabled"); } @Override public void onDisable() { getLogger().info("[RenderDistanceLimiter]: Plugin is disabled"); } @EventHandler public void onJoin(PlayerJoinEvent event) { Player player = event.getPlayer(); init(player); Bukkit.getServer().broadcast(Component.text("Welcome " + player.getName())); player.sendMessage("Welcome to Minecraft, but with only one chunk of render distance!"); } @EventHandler public void onLeave(PlayerQuitEvent event) { exempt.remove(event.getPlayer().getUniqueId()); chunkEntities.remove(event.getPlayer()); } @EventHandler public void onTeleport(PlayerTeleportEvent event) { init(event.getPlayer()); } @EventHandler public void onRespawn(PlayerRespawnEvent event) { init(event.getPlayer()); } @EventHandler public void onDimensionChange(PlayerChangedWorldEvent event) { Bukkit.getScheduler().runTaskLater(this, () -> init(event.getPlayer()), 5L); } @EventHandler public void onMove(PlayerMoveEvent event) { Location from = event.getFrom(); Location to = event.getTo(); if (hasMovedToNewChunk(from, to)) { Player player = event.getPlayer(); if (!exempt.contains(player.getUniqueId())) { handlePlayerMove(player, from, to); } } } @EventHandler public void onCrouch(PlayerToggleSneakEvent event) { Player player = event.getPlayer(); if (!exempt.contains(player.getUniqueId()) && !player.isSneaking()) { handlePlayerCrouch(player); } } private boolean hasMovedToNewChunk(Location from, Location to) { return from.getChunk().getX() != to.getChunk().getX() || from.getChunk().getZ() != to.getChunk().getZ(); } private void init(Player player) { Set<Integer> chunkEntitiesSet = new HashSet<>(); Location location = player.getLocation(); int posX = location.getChunk().getX(); int posZ = location.getChunk().getZ(); sendWorldChunk(player, posX, posZ, false); sendFillerChunk(player, posX + 1, posZ); sendFillerChunk(player, posX - 1, posZ); sendFillerChunk(player, posX, posZ + 1); sendFillerChunk(player, posX, posZ - 1); for (Entity entity : location.getChunk().getEntities()) { showEntity(player, entity); chunkEntitiesSet.add(entity.getEntityId()); } chunkEntities.put(player, chunkEntitiesSet); } private void sendFillerChunk(Player player, int x, int z) { sendWorldChunk(player, x, z, true); } private void sendWorldChunk(Player player, int x, int z, boolean fillWithAir) { PacketContainer packet = protocolManager.createPacket(PacketType.Play.Server.MAP_CHUNK); packet.getIntegers().write(0, x); packet.getIntegers().write(1, z); if (fillWithAir) { packet.getByteArrays().write(0, new byte[0]); // Sending empty data for the filler chunk } else { packet.getByteArrays().write(0, new byte[0]); // Placeholder for real chunk data } try { protocolManager.sendServerPacket(player, packet); } catch (InvocationTargetException e) { e.printStackTrace(); } } private void showEntity(Player player, Entity entity) { PacketContainer packet = protocolManager.createPacket(PacketType.Play.Server.SPAWN_ENTITY); packet.getIntegers().write(0, entity.getEntityId()); packet.getUUIDs().write(0, entity.getUniqueId()); packet.getDoubles().write(0, entity.getLocation().getX()); packet.getDoubles().write(1, entity.getLocation().getY()); packet.getDoubles().write(2, entity.getLocation().getZ()); try { protocolManager.sendServerPacket(player, packet); } catch (InvocationTargetException e) { e.printStackTrace(); } } private void handlePlayerMove(Player player, Location from, Location to) { int fromX = from.getChunk().getX(); int fromZ = from.getChunk().getZ(); int toX = to.getChunk().getX(); int toZ = to.getChunk().getZ(); sendFillerChunk(player, toX + 1, toZ); sendFillerChunk(player, toX - 1, toZ); sendFillerChunk(player, toX, toZ + 1); sendFillerChunk(player, toX, toZ - 1); sendWorldChunk(player, toX, toZ, false); hideEntitiesInChunk(player, fromX, fromZ); showEntitiesInChunk(player, toX, toZ); } private void handlePlayerCrouch(Player player) { String direction = player.getFacing().name(); List<int[]> directions = new ArrayList<>(); if (crouchLoaded.containsKey(player.getUniqueId())) { int[] last = crouchLoaded.get(player.getUniqueId()); if (player.getLocation().getChunk().getX() != last[0] || player.getLocation().getChunk().getZ() != last[1]) { sendFillerChunk(player, last[0], last[1]); hideEntitiesInChunk(player, last[0], last[1]); } } int playerX = player.getLocation().getChunk().getX(); int playerZ = player.getLocation().getChunk().getZ(); switch (direction) { case "NORTH": directions.add(new int[]{0, -2, 1}); directions.add(new int[]{-1, -1, 1}); directions.add(new int[]{1, -1, 1}); directions.add(new int[]{0, -1, 0}); break; case "EAST": directions.add(new int[]{2, 0, 1}); directions.add(new int[]{1, -1, 1}); directions.add(new int[]{1, 1, 1}); directions.add(new int[]{1, 0, 0}); break; case "SOUTH": directions.add(new int[]{0, 2, 1}); directions.add(new int[]{1, 1, 1}); directions.add(new int[]{-1, 1, 1}); directions.add(new int[]{0, 1, 0}); break; case "WEST": directions.add(new int[]{-2, 0, 1}); directions.add(new int[]{-1, 1, 1}); directions.add(new int[]{-1, -1, 1}); directions.add(new int[]{-1, 0, 0}); break; } for (int[] offset : directions) { boolean fillWithAir = offset[2] != 0; sendWorldChunk(player, playerX + offset[0], playerZ + offset[1], fillWithAir); if (!fillWithAir) { int[] crouchChunk = new int[]{playerX + offset[0], playerZ + offset[1]}; crouchLoaded.put(player.getUniqueId(), crouchChunk); showEntitiesInChunk(player, crouchChunk[0], crouchChunk[1]); } } } private void hideEntitiesInChunk(Player player, int x, int z) { World world = player.getWorld(); Chunk chunk = world.getChunkAt(x, z); for (Entity entity : chunk.getEntities()) { hideEntity(player, entity); } } private void showEntitiesInChunk(Player player, int x, int z) { World world = player.getWorld(); Chunk chunk = world.getChunkAt(x, z); for (Entity entity : chunk.getEntities()) { showEntity(player, entity); } } private void hideEntity(Player player, Entity entity) { PacketContainer packet = protocolManager.createPacket(PacketType.Play.Server.ENTITY_DESTROY); packet.getIntegerArrays().write(0, new int[]{entity.getEntityId()}); try { protocolManager.sendServerPacket(player, packet); } catch (InvocationTargetException e) { e.printStackTrace(); } } @Override public boolean onCommand(CommandSender sender, Command command, String label, String[] args) { if (!(sender instanceof Player)) { sender.sendMessage("You must be a player to use this command."); return false; } Player player = (Player) sender; if (command.getName().equalsIgnoreCase("seeall")) { if (!sender.hasPermission("OneChunk.seeall")) { sender.sendMessage("You do not have permission."); return true; } exempt.add(player.getUniqueId()); for (Chunk chunk : player.getWorld().getLoadedChunks()) { showEntitiesInChunk(player, chunk.getX(), chunk.getZ()); } return true; } if (command.getName().equalsIgnoreCase("onechunk")) { if (args.length == 0) { sender.sendMessage("Arguments are required."); return true; } if (args[0].equalsIgnoreCase("disableCrouchLoading")) { if (!sender.hasPermission("OneChunk.SetCrouchStatus")) { sender.sendMessage("You do not have permission."); return true; } getConfig().set("OneChunk.CrouchingEnabled", false); saveConfig(); reloadConfig(); sender.sendMessage("Crouch loading disabled."); return true; } if (args[0].equalsIgnoreCase("enableCrouchLoading")) { if (!sender.hasPermission("OneChunk.SetCrouchStatus")) { sender.sendMessage("You do not have permission."); return true; } getConfig().set("OneChunk.CrouchingEnabled", true); saveConfig(); reloadConfig(); sender.sendMessage("Crouch loading enabled."); return true; } } return true; } @Override public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, @NotNull String[] args) { if (sender.hasPermission("OneChunk.SetCrouchStatus") && args.length == 1) { return Arrays.asList("disableCrouchLoading", "enableCrouchLoading"); } return Collections.emptyList(); }

}

xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId> <artifactId>renderdistancelimiter</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>17</maven.compiler.source> <maven.compiler.target>17</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <repositories> <repository> <id>papermc</id> <url>https://repo.papermc.io/repository/maven-public/</url> </repository> </repositories> <dependencies> <dependency> <groupId>io.papermc.paper</groupId> <artifactId>paper-api</artifactId> <version>1.21-R0.1-SNAPSHOT</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.comphenix.protocol</groupId> <artifactId>ProtocolLib</artifactId> <version>5.1.0-SNAPSHOT</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.11.0</version> <configuration> <source>${maven.compiler.source}</source> <target>${maven.compiler.target}</target> </configuration> </plugin> </plugins> </build>

</project>

Error when entering new chunk:

When trying to enter a new chunk the following code is projected into the server console:

01.08 11:50:40 [Server] INFO at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:56) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1537) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:201) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1514) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1507) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:114) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1629) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1304) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:330) ~[paper-1.21.jar:1.21-119-100d75a] 01.08 11:50:40 [Server] INFO at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

submitted by /u/AllDayWarrior
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