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Prevent zombie reinforcements from loading chunks #11175

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Prevent zombie reinforcements from loading chunks #11175

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c309597
Create 1045-Prevent-spawn-placement-loading-chunks.patch
NewwindServer Jul 27, 2024
2ae1f05
Just prevent reinforcements loading chunks for now
NewwindServer Jul 29, 2024
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27 changes: 27 additions & 0 deletions patches/server/1045-Prevent-zombie-reinforcements-loading-chunks.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Newwind <[email protected]>
Date: Sat, 27 Jul 2024 11:09:37 +0200
Subject: [PATCH] Prevent zombie reinforcements loading chunks

When a zombie calls reinforcements it tries to spawn them in a random location within a 40 block radius of the zombie,
before spawning, it checks isSpawnPositionOk() for the position which loads the block to check if a mob can spawn on said block.
This patch ensures the chunk at the random location is loaded before trying to spawn the reinforcement zombie in it.


diff --git a/src/main/java/net/minecraft/world/entity/monster/Zombie.java b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
index 228000463..7cb98b312 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
@@ -344,6 +344,12 @@ public class Zombie extends Monster {
BlockPos blockposition = new BlockPos(i1, j1, k1);
EntityType<?> entitytypes = entityzombie.getType();

+ // Paper start - Prevent reinforcement checks from loading chunks
+ if (this.level().getChunkIfLoadedImmediately(blockposition.getX() >> 4, blockposition.getZ() >> 4) == null) {
+ continue;
+ }
+ // Paper end - Prevent reinforcement checks from loading chunks
+
if (SpawnPlacements.isSpawnPositionOk(entitytypes, this.level(), blockposition) && SpawnPlacements.checkSpawnRules(entitytypes, worldserver, MobSpawnType.REINFORCEMENT, blockposition, this.level().random)) {
entityzombie.setPos((double) i1, (double) j1, (double) k1);
if (!this.level().hasNearbyAlivePlayerThatAffectsSpawning((double) i1, (double) j1, (double) k1, 7.0D) && this.level().isUnobstructed(entityzombie) && this.level().noCollision((Entity) entityzombie) && !this.level().containsAnyLiquid(entityzombie.getBoundingBox())) { // Paper - Affects Spawning API
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