From a7280b185f522773b4a4c1e597f0e50f354b1c89 Mon Sep 17 00:00:00 2001
From: grilledham <jrdgillham@gmail.com>
Date: Tue, 12 Jun 2018 00:16:20 +0100
Subject: [PATCH] stopped perlin noise returning zero on integer inputs

---
 map_gen/shared/perlin_noise.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/map_gen/shared/perlin_noise.lua b/map_gen/shared/perlin_noise.lua
index e9f84eb7..37b14e84 100644
--- a/map_gen/shared/perlin_noise.lua
+++ b/map_gen/shared/perlin_noise.lua
@@ -36,6 +36,11 @@ function perlin:noise(x, y, z)
     y = y or 0
     z = z or 0
 
+    -- This prevents integer inputs returning 0, which casues 'straight line' artifacts.
+    x = x - 0.55077056353912
+    y = y - 0.131357755512
+    z = z - 0.20474238274619
+
     -- Calculate the "unit cube" that the point asked will be located in
     local xi = bit32.band(math.floor(x),255)
     local yi = bit32.band(math.floor(y),255)