From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 7 Mar 2021 13:15:04 -0800
Subject: [PATCH] Do not run raytrace logic for AIR

Saves approx. 5% for the raytrace call, as most (expensive)
raytracing tends to go through air and returning early is an
easy win. The remaining problems with this function
are mostly with the block getting itself.

diff --git a/src/main/java/net/minecraft/world/level/BlockGetter.java b/src/main/java/net/minecraft/world/level/BlockGetter.java
index 04194b5d5560e3620131c2f5cdea84ff814a4c25..0e8746759752b692668886370181aa5db1fd0bb0 100644
--- a/src/main/java/net/minecraft/world/level/BlockGetter.java
+++ b/src/main/java/net/minecraft/world/level/BlockGetter.java
@@ -79,6 +79,7 @@ public interface BlockGetter extends LevelHeightAccessor {
                 return BlockHitResult.miss(raytrace1.getTo(), Direction.getNearest(vec3d.x, vec3d.y, vec3d.z), BlockPos.containing(raytrace1.getTo()));
             }
             // Paper end
+            if (iblockdata.isAir()) return null; // Paper - optimise air cases
             FluidState fluid = iblockdata.getFluidState(); // Paper - don't need to go to world state again
             Vec3 vec3d = raytrace1.getFrom();
             Vec3 vec3d1 = raytrace1.getTo();