java - Fixed Point Perlin Noise returns sum of input points as output -

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i have taken fixed-point perlin-noise implementation from: http://mrl.nyu.edu/~perlin/noise/inoise.java , modified compiles under c#. in version 1.0 represented 2^16.

when pass in input coordinates (int x, int y, int z) output sum of x , z coordinates. wrong class or input points? here example of returned output:

    (int y = 0; y < 1; y++) {          (int x = 0; x < 16; x++) {              (int z = 0; z < 16; z++) {                  debug.log(perlinnoisefixedpoint.noise3d(x, y, z));             }         }     } 
output: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 1, 2, 3, 4, 5, 6,   7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,  15, 16, 17, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 4, 5, 6, 7,  8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 5, 6, 7, 8, 9, 10, 11, 12, 13,   14, 15, 16, 17, 18, 19, 20, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,  20, 21, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 8, 9, 10,  11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 9, 10, 11, 12, 13, 14, 15,  16, 17, 18, 19, 20, 21, 22, 23, 24, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,  21, 22, 23, 24, 25, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,  26, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 13, 14, 15,  16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 14, 15, 16, 17, 18, 19, 20,  21, 22, 23, 24, 25, 26, 27, 28, 29, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,  26, 27, 28, 29, 30 
public class perlinnoisefixedpoint {      public static int noise3d(int x, int y, int z) {          int x = x >> 16 & 255, y = y >> 16 & 255, z = z >> 16 & 255, n = 1 << 16;          x &= n - 1; y &= n - 1; z &= n - 1;          int u = fade(x), v = fade(y), w = fade(z), = p[x] + y, aa = p[a] + z, ab = p[a + 1] + z,          b = p[x + 1] + y, ba = p[b] + z, bb = p[b + 1] + z;          return lerp(w, lerp(v, lerp(u, grad(p[aa  ], x   , y   , z   ),                                          grad(p[ba  ], x-n , y   , z   )),                                 lerp(u, grad(p[ab  ], x   , y-n , z   ),                                          grad(p[bb  ], x-n , y-n , z   ))),                        lerp(v, lerp(u, grad(p[aa+1], x   , y   , z-n ),                                          grad(p[ba+1], x-n , y   , z-n )),                                 lerp(u, grad(p[ab+1], x   , y-n , z-n ),                                        grad(p[bb+1], x-n , y-n , z-n ))));     }     static int lerp(int t, int a, int b) {           return + (t * (b - a) >> 12);     }      static int grad(int hash, int x, int y, int z) {          int h = hash & 15, u = h < 8 ? x : y, v = h < 4 ? y : h == 12 || h == 14 ? x : z;         return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);     }      static int fade(int t) {          int t0 = f[t >> 8], t1 = f[math.min(255, (t >> 8) + 1)];         return t0 + ( (t & 255) * (t1 - t0) >> 8 );     }      static int[] p = new int[512] {          151,160,137,91,90,15,         131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,         190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,         88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,         77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,         102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,         135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,         5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,         223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,         129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,         251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,         49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,         138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,          151,160,137,91,90,15,         131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,         190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,         88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,         77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,         102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,         135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,         5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,         223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,         129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,         251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,         49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,         138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,     };      static int[] f = new int[256] {          0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 6, 7,          9, 10, 12, 14, 17, 19, 22, 25, 29, 32, 36, 40, 45, 49, 54, 60,          65, 71, 77, 84, 91, 98, 105, 113, 121, 130, 139, 148, 158, 167, 178, 188,          199, 211, 222, 234, 247, 259, 273, 286, 300, 314, 329, 344, 359, 374, 390, 407,          424, 441, 458, 476, 494, 512, 531, 550, 570, 589, 609, 630, 651, 672, 693, 715,          737, 759, 782, 805, 828, 851, 875, 899, 923, 948, 973, 998, 1023, 1049, 1074, 1100,          1127, 1153, 1180, 1207, 1234, 1261, 1289, 1316, 1344, 1372, 1400, 1429, 1457, 1486, 1515, 1543,          1572, 1602, 1631, 1660, 1690, 1719, 1749, 1778, 1808, 1838, 1868, 1898, 1928, 1958, 1988, 2018,          2048, 2077, 2107, 2137, 2167, 2197, 2227, 2257, 2287, 2317, 2346, 2376, 2405, 2435, 2464, 2493,          2523, 2552, 2580, 2609, 2638, 2666, 2695, 2723, 2751, 2779, 2806, 2834, 2861, 2888, 2915, 2942,          2968, 2995, 3021, 3046, 3072, 3097, 3122, 3147, 3172, 3196, 3220, 3244, 3267, 3290, 3313, 3336,          3358, 3380, 3402, 3423, 3444, 3465, 3486, 3506, 3525, 3545, 3564, 3583, 3601, 3619, 3637, 3654,          3672, 3688, 3705, 3721, 3736, 3751, 3766, 3781, 3795, 3809, 3822, 3836, 3848, 3861, 3873, 3884,          3896, 3907, 3917, 3928, 3937, 3947, 3956, 3965, 3974, 3982, 3990, 3997, 4004, 4011, 4018, 4024,          4030, 4035, 4041, 4046, 4050, 4055, 4059, 4063, 4066, 4070, 4073, 4076, 4078, 4081, 4083, 4085,          4086, 4088, 4089, 4091, 4092, 4092, 4093, 4094, 4094, 4095, 4095, 4095, 4095, 4095, 4095, 4095,      }; }


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