bytev-charts/lib/plugin/three.js/examples/js/math/ImprovedNoise.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

console.warn("THREE.ImprovedNoise: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation."); // http://mrl.nyu.edu/~perlin/noise/

THREE.ImprovedNoise = function () {
  var p = [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];

  for (var i = 0; i < 256; i++) {
    p[256 + i] = p[i];
  }

  function fade(t) {
    return t * t * t * (t * (t * 6 - 15) + 10);
  }

  function lerp(t, a, b) {
    return a + t * (b - a);
  }

  function grad(hash, x, y, z) {
    var h = hash & 15;
    var 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);
  }

  return {
    noise: function noise(x, y, z) {
      var floorX = Math.floor(x),
          floorY = Math.floor(y),
          floorZ = Math.floor(z);
      var X = floorX & 255,
          Y = floorY & 255,
          Z = floorZ & 255;
      x -= floorX;
      y -= floorY;
      z -= floorZ;
      var xMinus1 = x - 1,
          yMinus1 = y - 1,
          zMinus1 = z - 1;
      var u = fade(x),
          v = fade(y),
          w = fade(z);
      var A = 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], xMinus1, y, z)), lerp(u, grad(p[AB], x, yMinus1, z), grad(p[BB], xMinus1, yMinus1, z))), lerp(v, lerp(u, grad(p[AA + 1], x, y, zMinus1), grad(p[BA + 1], xMinus1, y, z - 1)), lerp(u, grad(p[AB + 1], x, yMinus1, zMinus1), grad(p[BB + 1], xMinus1, yMinus1, zMinus1))));
    }
  };
};