From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 31 Mar 2016 19:17:58 -0400
Subject: [PATCH] Do not load chunks for Pathfinding


diff --git a/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java b/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
index e6a2f836e70a267da36ec87e0df68e36bae3626c..6c063351c76e92a8a91142a12db846d1c1f11921 100644
--- a/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
+++ b/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
@@ -46,7 +46,7 @@ public abstract class PathNavigation {
     private BlockPos targetPos;
     private int reachRange;
     private float maxVisitedNodesMultiplier = 1.0F;
-    private final PathFinder pathFinder;
+    private final PathFinder pathFinder; public PathFinder getPathfinder() { return this.pathFinder; } // Paper - OBFHELPER
     private boolean isStuck;
 
     public PathNavigation(Mob mob, Level world) {
diff --git a/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java b/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
index e855754bdb8431efc06c77b42d9a90b870abab8d..800d464207026d145056b39b298045121342b899 100644
--- a/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
+++ b/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
@@ -21,7 +21,7 @@ public class PathFinder {
     private static final float FUDGING = 1.5F;
     private final Node[] neighbors = new Node[32];
     private final int maxVisitedNodes;
-    private final NodeEvaluator nodeEvaluator;
+    private final NodeEvaluator nodeEvaluator; public NodeEvaluator getPathfinder() { return this.nodeEvaluator; }  // Paper - OBFHELPER
     private static final boolean DEBUG = false;
     private final BinaryHeap openSet = new BinaryHeap();
 
diff --git a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
index 204ed5665adf2df7252fe2d21872db6956415311..b37acb6e6e253529a38f44a518a02c7747d3145e 100644
--- a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
+++ b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
@@ -453,7 +453,12 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                 for(int n = -1; n <= 1; ++n) {
                     if (l != 0 || n != 0) {
                         pos.set(i + l, j + m, k + n);
-                        BlockState blockState = world.getBlockState(pos);
+                        // Paper start
+                        BlockState blockState = world.getTypeIfLoaded(pos);
+                        if (blockState == null) {
+                            return BlockPathTypes.BLOCKED;
+                        } else {
+                        // Paper end
                         if (blockState.is(Blocks.CACTUS)) {
                             return BlockPathTypes.DANGER_CACTUS;
                         }
@@ -469,6 +474,7 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                         if (world.getFluidState(pos).is(FluidTags.WATER)) {
                             return BlockPathTypes.WATER_BORDER;
                         }
+                        } // Paper
                     }
                 }
             }
@@ -478,7 +484,8 @@ public class WalkNodeEvaluator extends NodeEvaluator {
     }
 
     protected static BlockPathTypes getBlockPathTypeRaw(BlockGetter world, BlockPos pos) {
-        BlockState blockState = world.getBlockState(pos);
+        BlockState blockState = world.getTypeIfLoaded(pos); // Paper
+        if (blockState == null) return BlockPathTypes.BLOCKED; // Paper
         Block block = blockState.getBlock();
         Material material = blockState.getMaterial();
         if (blockState.isAir()) {