DONT KNOW :D

headers/VUtils/SimplexNoise.h

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+/**
+ * @file    SimplexNoise.h
+ * @brief   A Perlin Simplex Noise C++ Implementation (1D, 2D, 3D).
+ *
+ * Copyright (c) 2014-2018 Sebastien Rombauts (sebastien.rombauts@gmail.com)
+ *
+ * Distributed under the MIT License (MIT) (See accompanying file LICENSE.txt
+ * or copy at http://opensource.org/licenses/MIT)
+ */
+#pragma once
+
+#include <cstddef>  // size_t
+
+/**
+ * @brief A Perlin Simplex Noise C++ Implementation (1D, 2D, 3D, 4D).
+ */
+class SimplexNoise {
+public:
+    // 1D Perlin simplex noise
+    static float noise(float x);
+    // 2D Perlin simplex noise
+    static float noise(float x, float y);
+    // 3D Perlin simplex noise
+    static float noise(float x, float y, float z);
+
+    // Fractal/Fractional Brownian Motion (fBm) noise summation
+    float fractal(size_t octaves, float x) const;
+    float fractal(size_t octaves, float x, float y) const;
+    float fractal(size_t octaves, float x, float y, float z) const;
+
+    /**
+     * Constructor of to initialize a fractal noise summation
+     *
+     * @param[in] frequency    Frequency ("width") of the first octave of noise (default to 1.0)
+     * @param[in] amplitude    Amplitude ("height") of the first octave of noise (default to 1.0)
+     * @param[in] lacunarity   Lacunarity specifies the frequency multiplier between successive octaves (default to 2.0).
+     * @param[in] persistence  Persistence is the loss of amplitude between successive octaves (usually 1/lacunarity)
+     */
+    explicit SimplexNoise(float frequency = 1.0f,
+                          float amplitude = 1.0f,
+                          float lacunarity = 2.0f,
+                          float persistence = 0.5f) :
+            mFrequency(frequency),
+            mAmplitude(amplitude),
+            mLacunarity(lacunarity),
+            mPersistence(persistence) {
+    }
+
+private:
+    // Parameters of Fractional Brownian Motion (fBm) : sum of N "octaves" of noise
+    float mFrequency;   ///< Frequency ("width") of the first octave of noise (default to 1.0)
+    float mAmplitude;   ///< Amplitude ("height") of the first octave of noise (default to 1.0)
+    float mLacunarity;  ///< Lacunarity specifies the frequency multiplier between successive octaves (default to 2.0).
+    float mPersistence; ///< Persistence is the loss of amplitude between successive octaves (usually 1/lacunarity)
+};