From 1d71954394d54b31460222f389bb36dbdfaccc07 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Fri, 4 Jun 2021 13:58:03 +0300
Subject: [PATCH] Fix perlin noise normalization

---
 libs/pcg/include/psemek/pcg/perlin.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/pcg/include/psemek/pcg/perlin.hpp b/libs/pcg/include/psemek/pcg/perlin.hpp
index e8fde98d..babc663d 100644
--- a/libs/pcg/include/psemek/pcg/perlin.hpp
+++ b/libs/pcg/include/psemek/pcg/perlin.hpp
@@ -122,7 +122,9 @@ namespace psemek::pcg
 				values[mask] = smoothstep(values[mask], values[mask | (1 << i)], t[i]);
 		}
 
-		return 0.5 * (1. + std::sqrt(2.) * values[0]);
+		auto const M = std::sqrt(T(N) / T(4));
+
+		return 0.5 * (1. + values[0] / M);
 	}
 
 }