KdotJPG

/*
 * OpenSimplex Noise in Java.
 * by Kurt Spencer
 * 
 * Tileable 3D version, preliminary release.
 * Could probably use further optimization.
 *
 * w6, h6, and d6 are each 1/6 of the repeating period.
 * for x, y, z respectively. If w6 = 2, h6 = 2, d6 = 2,
 * then the noise repeats in blocks of (0,0,0)->(12,12,12)

KdotJPG

/**
 * K.jpg's OpenSimplex 2, smooth variant ("SuperSimplex")
 *
 * More language ports, as well as legacy 2014 OpenSimplex, can be found here:
 * https://github.com/KdotJPG/OpenSimplex2
 */

public class OpenSimplex2S {

    private static final long PRIME_X = 0x5205402B9270C86FL;