From 94d24a568e63591ca653be2a2e248b8520eb740a Mon Sep 17 00:00:00 2001
From: Zach Brown <Zbob750@live.com>
Date: Tue, 8 Jul 2014 16:29:49 -0500
Subject: [PATCH] Fix directional TNT bias


diff --git a/src/main/java/net/minecraft/server/EntityTNTPrimed.java b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
index a442cb1..252ed04 100644
--- a/src/main/java/net/minecraft/server/EntityTNTPrimed.java
+++ b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
@@ -19,11 +19,11 @@ public class EntityTNTPrimed extends Entity {
     public EntityTNTPrimed(World world, double d0, double d1, double d2, EntityLiving entityliving) {
         this(world);
         this.setPosition(d0, d1, d2);
-        float f = (float) (Math.random() * 3.1415927410125732D * 2.0D);
+        //float f = (float) (Math.random() * 3.1415927410125732D * 2.0D); // PaperSpigot - Fix directional TNT bias
 
-        this.motX = (double) (-((float) Math.sin((double) f)) * 0.02F);
+        this.motX = // PaperSpigot - Fix directional TNT bias //(double) (-((float) Math.sin((double) f)) * 0.02F);
         this.motY = 0.20000000298023224D;
-        this.motZ = (double) (-((float) Math.cos((double) f)) * 0.02F);
+        this.motZ = // PaperSpigot - Fix directional TNT bias //(double) (-((float) Math.cos((double) f)) * 0.02F);
         this.fuseTicks = 80;
         this.lastX = d0;
         this.lastY = d1;
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 3bb1302..9b10da7 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1895,6 +1895,12 @@ public abstract class World implements IBlockAccess {
         double d1 = 1.0D / ((axisalignedbb.e - axisalignedbb.b) * 2.0D + 1.0D);
         double d2 = 1.0D / ((axisalignedbb.f - axisalignedbb.c) * 2.0D + 1.0D);
 
+        // PaperSpigot start - Fix directional TNT bias
+        // Shift the sample points so they are centered on the BB, to avoid directional bias
+        double xOffset = (1.0 - Math.floor(1.0 / d0) * d0) / 2.0;
+        double zOffset = (1.0 - Math.floor(1.0 / d2) * d2) / 2.0;
+        // PaperSpigot end
+
         if (d0 >= 0.0D && d1 >= 0.0D && d2 >= 0.0D) {
             int i = 0;
             int j = 0;
@@ -1907,7 +1913,7 @@ public abstract class World implements IBlockAccess {
                         double d4 = axisalignedbb.b + (axisalignedbb.e - axisalignedbb.b) * (double) f1;
                         double d5 = axisalignedbb.c + (axisalignedbb.f - axisalignedbb.c) * (double) f2;
 
-                        if (this.a(vec3d2.b(d3, d4, d5), vec3d) == null) { // CraftBukkit
+                        if (this.a(vec3d2.b(xOffset + d3, d4, zOffset + d5), vec3d) == null) { // PaperSpigot - Fix directional TNT bias // CraftBukkit
                             ++i;
                         }
 
-- 
1.9.1