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Paper/Spigot-Server-Patches/0352-Prevent-mob-spawning-from-loading-generating-chunks.patch

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From 486bdf075eb79ddb255338c537871df4d7a2742a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 12 Sep 2018 21:12:57 -0400
Subject: [PATCH] Prevent mob spawning from loading/generating chunks
also prevents if out of world border bounds
diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
index bfbe4d3e39..17bb81c03e 100644
--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -129,9 +129,9 @@ public final class SpawnerCreature {
int i2 = blockposition1.getX();
int j2 = blockposition1.getY();
int k2 = blockposition1.getZ();
- IBlockData iblockdata = worldserver.getType(blockposition1);
+ IBlockData iblockdata = worldserver.getTypeIfLoadedAndInBounds(blockposition1); // Paper - don't load chunks for mob spawn
- if (!iblockdata.isOccluding()) {
+ if (iblockdata != null && !iblockdata.isOccluding()) { // Paper - don't load chunks for mob spawn
int l2 = 0;
int i3 = 0;
@@ -158,7 +158,7 @@ public final class SpawnerCreature {
float f1 = (float) l3 + 0.5F;
EntityHuman entityhuman1 = worldserver.a((double) f, (double) f1, -1.0D);
- if (entityhuman1 != null) {
+ if (entityhuman1 != null && worldserver.isLoadedAndInBounds(blockposition_mutableblockposition)) { // Paper - don't load chunks for mob spawn
double d0 = entityhuman1.d((double) f, (double) k3, (double) f1);
if (d0 > 576.0D && blockposition.distanceSquared((double) f, (double) k3, (double) f1) >= 576.0D) {
--
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